Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Publishing type：Research paper (international conference proceedings)  

In our daily lives, we often use onomatopoeia to describe objects and products. However, the correspondence between onomatopoeia and acoustical characteristics of these objects is unclear. To apply onomatopoeia to product design, we focused herein on the relationship between the sound symbolism of onomatopoeia and product sound quality. The target of evaluation was the operating sound of a rotary switch. A subjective evaluation experiment was conducted wherein the study participants were asked to provide impromptu answers using onomatopoeic expressions on their impressions associated with the operating sound of rotary switches. The obtained onomatopoeia was then analyzed via quantitative text analysis using mora as the unit of analysis. The results showed that the voiced consonants appeared more frequently in the louder operating sounds. In addition, the vowel/o/appeared more frequently in sounds with low sharpness, and the vowel/i/appeared more frequently in sounds with high sharpness. As these trends are similar to those observed in other studies on sound symbolism, this study shows the possibility of using onomatopoeia in product design.

DOI： 10.3397/IN-2021-1745

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：自動車技術会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：自動車技術会  

In this research, to improve the operational feeling of the rotary switch, we investigated the construction method of the switch operation feeling model by grasping the correlation between the subjective evaluation and the physical quantity for the continuous complex stimulus of tactile sensation and operation sound. First, the impression was evaluated under a single stimulus of the tactile stimulus and the operation sound stimulus, and each physical quantity corresponding to each stimulus was grasped. Next, the tendency of the operational feeling was grasped by the impression evaluation under the complex stimulus. As a result, the operation sensation estimation model created in this study showed high agreement with the actual operation sensation.

DOI： 10.11351/jsaeronbun.51.695

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：自動車技術会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCI LTD  

A method to facilitate the efficient positioning of sound absorbing materials on the walls of an enclosure is proposed by quantifying the contribution of each wall segment to the sound field in a vibro-acoustic transfer matrix. Wall reflections can be considered as secondary sources of radiation, whose strengths depend on the primary source and the amount of absorption by the walls. Based on this idea, the proposed evaluation method to quantify the degree of effectiveness for each wall segment is to quantify the linear independence of the rows or columns in a transfer matrix. The multiplication of quantified linear independence of elements in two transfer matrices consisting of the transfer path of sound is suggested as an observation parameter for selection. The proposed method is verified through numerical simulations and experiments. As absorbing patterns are treated at the surfaces with the highest linear independence in the transfer matrix, the sound pressure at most frequencies decreases for a point receiver or a finite region of receivers. The proposed method has advantages in terms of required effort, because it does not require any iteration process. The proposed method can produce a practically applicable solution without any detailed assumptions about the sound source and boundary conditions which are not clearly known at the design stage. (C) 2017 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.apacoust.2017.08.015

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Human Interface Society  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Noise Control Engineering  

A simple pitch extraction-based approach for predicting the major pitch components of a bell whose shape is distinctly different from that of traditional bells is suggested. Essentially, the perceived pitch is closely related to the absolute sound pressure, which depends on the listening space and position of the listener. Therefore, it is necessary to use a representative spectrum for pitch extraction because it is not possible to precisely recreate the listening conditions of a given listener. As an alternative, the structural response of the bell is employed as a representative spectrum. As an example application of the suggested approach, the design of the ‘Gaudi bell,’ which is a uniquely shaped multi-pitch bell, is considered, and spectral pitch patterns that are similar to that of the recorded signal are obtained via pitch extraction from the structural response function. Moreover, it is observed that a synthesized signal of pure tones with the frequencies of the predicted pitch can yield information regarding additional pitch components that cannot be extracted from the structural response. Although the suggested method is not capable of predicting a sound with high precision, it can provide useful information without the necessity of actual manufacturing.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

DOI： 10.1299/transjsme.16-00064

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Human Interface Society  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

Seat position and angle are adjusted electrically in the power seat of an automobile, and the quality of the vehicles interior is degraded by fluctuating sound frequencies related to that seat. In this research, a sound stabilization design for the operating sound of the power seat was proposed considering the uncertainty inherent in the production assembly. Initially, the fluctuations influence on the sound quality was evaluated by varying the frequency and the Sound Pressure Level of the operation sound, and a standard value for the sound stabilization was determined by utilizing the Taguchi method to consider the SN ratio. Next, the Taguchi method was adapted to consider a simplified model of the joint elements of the seat slide. Then, an optimal control factor for sound stabilization was specified. The sound stabilization was applied, leading to a target value for the optimal control factor that was specified in the simplified model for the joint of the power seat. Finally, that target value was optimized using the optimal control factor. We concluded that it is possible to achieve sound stabilization of power seat operation while considering the uncertainty in production assembly in this research.

DOI： 10.1299/transjsme.15-00640

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Science and Technology  

DOI： 10.20697/jasj.72.1_17

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER INT PUBLISHING AG  

The sound characteristic of an acoustic guitar is empirically designed for long time. The up to date vibration and acoustic analysis are applied to investigate the difference between typical guitars especially focused on transient vibration and sound just after picking a string at keynote and higher harmonic frequencies. By using a simplified front plate model of a guitar with bracings, structural modification method is utilized to realize the Operational Deflection Shape in order to meet the target sound characteristic.

DOI： 10.1007/978-3-319-30084-9_17

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INT INST ACOUSTICS & VIBRATION  

Human muscle fatigue significantly affects rowing performance and can even cause injury. However, rowers do not always choose appropriate oars, out of ignorance of the required properties. In this research, muscle fatigue was evaluated using two kinds of oars, from two manufacturers, with different shaft rigidities. A microphone, three three-axis accelerometers, and a GPS were fastened to a single-scull boat to measure the noises and vibrations produced, and the boat speed, while rowing. The loudest noise was generated when the oars executed a feather turn at the end of a stroke, owing to the speed curve of the boat. A loud noise was also produced when the water was caught by the oars with a stiffer shaft. Thus, the noise produced by the oars and the rigger of boat was studied by a detailed modal analysis of the vibrations. Next, we evaluated the psychological effects of vibrations in the oars on the personal comfort of the rower, after holding the oars. Both kinds of oars were also used for this assessment. Low-frequency vibrations were shown to cause discomfort. Finally, low-frequency vibrations were also shown to produce muscle fatigue, through physiological measurements of the arms and torso muscles. We conclude that reducing vibrations in the oars can improve rowing performance, help prevent injury, and enhance comfort in terms of sound and vibrations.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Noise Control Engineering of the USA  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

For rendering a desired characteristics of a sound field, a proper conditioning of acoustic actuators in an array are required, but the source condition depends strongly on its position. Actuators located at inefficient positions for control would consume the input power too much or become too much sensitive to disturbing noise. These actuators can be considered redundant, which should be sorted out as far as such elimination does not damage the whole control performance significantly It is known that the inverse approach based on the acoustical holography concept, employing the transfer matrix between sources and field points as core element, is useful for rendering the desired sound field. By investigating the information indwelling in the transfer matrix between actuators and field points, the linear independency of an actuator from the others in the array can be evaluated. To this end, the square of the right singular vector, which means the radiation contribution horn the source, can be used as an indicator. Inefficient position for fulfilling the desired sound field can be determined as one having smallest indicator value among all possible actuator positions. The elimination process continues one by one, or group by group, until the remaining number of actuators meets the preset number. Control examples of exterior and interior spaces are taken for the validation. The results reveal that the present method for choosing least dependent actuators, for a given number of actuators and field condition, is quite effective in realizing the desired sound field with a noisy input condition, and in minimizing the required input power. (C) 2015 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jsv.2015.07.037

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Journal of Society of Automotive Engineers of Japan  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Science and Technology  

DOI： 10.20697/jasj.71.6_267

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

DOI： 10.11351/jsaeronbun.46.559

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

DOI： 10.11351/jsaeronbun.46.437

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

DOI： 10.11351/jsaeronbun.46.431

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Institute of Science and Engineering, Chuo University  

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Other Link： http://ir.c.chuo-u.ac.jp/repository/search/item/md/rsc/p/7142/

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

CFRP is being positively introduced because of its light weight with sufficient stiffness for example in vehicle body but from acoustic aspect more investigations are needed. In order to grasp the vibration and acoustic feature of flat and curved CFRP laminated plates with orthotropy, the difference from isotropic material such as steel is clarified using experimental modal analysis. As a result CFRP is found to possess a dominant radiating sound mode shape at specific frequency. Then based on the FE model of the CFRP plate, a small CFRP patch with optimum anisotropy is designed to attach for effective reduction of the sound and finally its performance is verified in experiment.

DOI： 10.1007/978-3-319-15236-3_9

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INT INST ACOUSTICS & VIBRATION  

Speech, noises induced by medical equipment and so on are loud in a hospital. Though, sufficient attention has not been paid to the medical sound environment. A questionnaire survey was conducted about the medical sound environment to patients and medical professionals about 1,000 people in a medical university hospital. According to the survey, the patients utilizing the chemotherapy room spent for 130 minutes in average. The patient's complaints were that alarm noise of medical equipment can't reduce, and speech privacy of neighboring patients can't protect due to using a curtain in the medical room. Furthermore, the stress of sound environment was correlated between psychological evaluation and physiological evaluation using an ECG. So, it is important that relax-able sound environment for patients and concentration-able sound environment for medical professionals are created. In this research, countermeasures against an issue of speech privacy in a chemotherapy room were considered. First, a sound masking system, speech privacy equipment with a film-like directional loudspeaker of electrostatics type (DS), was setup in a simulated medical room. Masking sound was played from a curvature DS (DSC) placing over a patient's bed. The sound directivity for a masking area was controlled by changing bending angle of DSC. Therefore, annoyance of the masking sound around the bed could be reduced by using the proposed system. Next, appropriate masking sound for satisfying both speech cobscurity and the allowance for annoyance in a masking area was studied. The relation between word intelligibility and masking sounds by using the logistic regression analysis was evaluated. Finally, the effectiveness of the system by using DSC and the appropriate masking sound was confirmed in the chemotherapy room of the medical university hospital.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The International Institute of Noise Control Engineering  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

In a mechanical structure development focusing on the noise and vibration, numerical analysis method like finite element method and structural optimization is widely used to predict and improve a frequency response of the structure. But, the results of these method are idealized and uncertainties in structure like parts shape and connecting part are neglected in many cases. In recent years, the mechanical structure is becoming slim and light weight to save a energy. Therefore, the influence of the uncertainties becomes large relatively, so it is necessary to take in the uncertainties to the numerical analysis. In this paper, as a one of the numerical analysis with uncertainties, robust design method based on stochastic finite element method and structural optimization will be discussed to minimize frequency response variance of structure by the uncertainties. In this paper, the robust design method were explained in detail. And, as an example of application, the robust design method was applied to an FE model. It showed that the structure which minimize the frequency response variance can be find efficiently by the robust design method.

DOI： 10.1299/transjsme.2014dr0329

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The International Institute of Noise Control Engineering  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

DOI： 10.11351/jsaeronbun.45.859

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

DOI： 10.11351/jsaeronbun.45.909

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

In a mechanical structure development focusing on the noise and vibration, numerical analysis method like finite element method and structural optimization is widely used to predict and improve a frequency response of the structure. But, the results of these method are idealized and uncertainties in structure like parts shape and connecting part are neglected in many cases. In recent years, the mechanical structure is becoming slim and light weight to save a energy. Therefore, the influence of the uncertainties becomes large relatively, so it is necessary to take in the uncertainties to the numerical analysis. In this paper, as a one of the numerical analysis with uncertainties, robust design method based on stochastic finite element method and structural optimization will be discussed to minimize frequency response variance of structure by the uncertainties. In this paper, the robust design method were explained in detail. And, as an example of application, the robust design method was applied to an FE model. It showed that the structure which minimize the frequency response variance can be find efficiently by the robust design method.

DOI： 10.1299/transjsme.2014dr0030

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Springer New York LLC  

In vibration engineering, unnecessary vibration energy can be dissipated by a damper into not only heat energy but also electric energy for energy harvesting. But a common damper for energy harvesting has to be tuned into a resonance in order to reserve large vibration and therefore for frequency varying case, the efficiency is very low and the application is limited. In this study a special damper system is so designed as to generate sufficient electric power even for frequency varying case based on two approaches: the resonance of the damper can be adjusted corresponding to the input frequency and the fixture of the damper has multiple resonances which coincide the structural resonances. The damper system consisted of permanent magnet and coil is verified to have variable resonance and the resonances of the damper fixture are found to have coincident resonances. Finally the damper system is applied to a motor bike where sufficient power is generated in case of varying engine rotation.

DOI： 10.1007/978-3-319-04570-2_15

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications Ltd  

In vibration engineering, unnecessary vibration energy can be dissipated by a damper into not only heat energy but also electric energy for energy harvesting. But a common damper for energy harvesting has to be tuned into a resonance in order to reserve large vibration and therefore for frequency varying case, the efficiency is very low and the application is limited. In this study a special damper system is so designed as to generate sufficient electric power even for frequency varying case based on two approaches: the resonance of the damper can be adjusted corresponding to the input frequency and the fixture of the damper has multiple resonances which coincide the structural resonances. The damper system consisted of permanent magnet and coil is verified to have variable resonance and the resonances of the damper fixture are found to have coincident resonances. Finally the damper system is applied to a motor bike where sufficient power is generated in case of varying engine rotation.

DOI： 10.1007/978-3-319-04570-2__15

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

DOI： 10.11351/jsaeronbun.44.1403

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Automotive Engineers of Japan  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Science and Technology  

DOI： 10.20697/jasj.69.6_267

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：International Institute of Acoustics and Vibrations  

It is not unusual to describe feeling of sound by expression on the visual impression such as 'bright', 'dark' and so on. This means that some coincidence or difference can be existed between the visual and auditory sensations. In this study, with the color diversification of industrial products and living space in the Smart Sound Space, the sound environment based on the preferred condition for a purpose of space between visual and auditory sensation was researched. From the viewpoint of the comfort of air conditioning such as 'cool', 'warm', sound such as 'quiet' and color such as 'bright' environment in today's living environment, an industrial product is usually actuated for one of the comfort purposes. On the other hand, a human has the sensory organ called the five senses generally. Therefore, the purpose of this study is to fulfill a purpose of the comfort by combined stimulation of sound and color for visual and auditory sensation in five senses, using multiple products such as the speaker and the color illumination. One of the comforts in this study is the sensible temperature such as 'cool' or 'warm' in air conditioning space. First, the condition of additional sound for the sensible temperature from relationship between the sensible temperature and the sound frequency band based on subjective evaluation in air conditioned space is understood. Then, in addition to condition of the sound, the condition of additional color for the sensible temperature from relationship between the sensible temperature and the color chromaticity by measurement using illuminance colorimeter based on subjective evaluation is understood. Therefore, suitable sound and color environment to control the sensible temperature in air conditioning space is proposed.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

In the conventional design process of the golf club, maximizing the ball carry distance was 1^st design objective. However, it is difficult to increase the distance more than other golf club maker, because volume of the club head, groove depth of the head face and etc.. are regularized by Golf Official Regulation. In this paper, to characterize the golf club and get ahead of the other maker, structural design of golf club based on the sound quality is discussed. Evaluating the sound quality of golf sound, most sensitive frequency range to improve the impression of sound is specified. And structural modification is applied to decrease the sound pressure of sensitive frequency range.

DOI： 10.1299/kikaic.78.2006

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

In this paper, the finite element modeling of Golf Club, prediction of radiation sound from the club, and structural modification to reduce the radiation sound are discussed. The golf club consists of head and shaft, and the club's characteristic (in particular damping ratio) is different from head, shaft each. In this paper, modeling of connection effect based on a structural damping is proposed. And volume acceleration is applied to predict the radiation sound from club head. Comparing volume acceleration and experimental radiation sound, it is shown that the relative frequency response can be predicted in sufficient accuracy. Finally, structural modification using plastic plate is discussed. The plastic plate influences to club as structural damping. The modeling to predict the effect of plastic plate is shown.

DOI： 10.1299/kikaic.78.2015

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Language：English   Publishing type：Research paper (international conference proceedings)  

Practical acoustic spaces are involved with various uncertainties which are hardly defined clearly and are not easy to be included in the design model. To suppress the effect of uncertainties to the designed result, one should condition the transfer matrix properly to precisely describe the relation between source array and observation points at target control zone. In this work, the evaluation and reduction method are investigated for the effects of uncertainties in the sound field rendering problem based on the inverse approach. Effect of uncertainties related to the source system such as input noise and misplacement of actuators can be evaluated by a parameter that consists of a combination of condition number of transfer matrix and mean square error of the noiseless observed field. Uncertainties related to the transmission path can be treated by the effective independence technique defining the linear independency among matrix components. To reduce the degradation of the rendering result due to uncertainties, the designed source array for a given field should somehow reveal low values of the aforementioned evaluation parameters.

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Language：English   Publishing type：Research paper (international conference proceedings)  

It is not unusual to describe feeling of sound by expression on the visual impression such as 'bright', 'dark' and so on. This means that some coincidence or difference can be existed between the visual and auditory sensations. In this study, with the color diversification of industrial products and living space in the Smart Sound Space, the sound design based on the preferred matching between visual and auditory sensation was researched. First, the effect of preferred matching between visual and auditory sensation was observed with the combination of wooden door knocking sound and displayed colors. For this purpose, a monitoring method using non-invasive sensors such as saliva amylase monitor was employed to observe the physiological reaction of subjects. The physiological reactions are highly affected on the stress induced by uncomfortable environment therefore it is suitable to evaluate the inconsonant feeling. As the result, it was observed that the tendency of small amount of salivary amylase which means the low stress with the pair evaluated as good matching of color and sound by subjective test. Next, combinations of 9 car body colors and 5 filtered sound samples modified from the measured door closing sound of the real compact car were evaluated by the preferred matching test. To develop a prediction model of visual and auditory matching, the correlation analysis between HSV color system and the frequency characteristics of sound samples were conducted. Based on this relation, it is possible to make good matching of color and sound of product. The same process was also applied to the combination of car body shape and sound.

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Language：English   Publishing type：Research paper (international conference proceedings)  

For the sound field rendering, the acoustical holography based on the inverse boundary element method is effective in estimating the source condition of the array system. One of the main concerning points in this inverse method is the applicability of solution. To maintain relative source strength difference between constituting elements of a source, the contribution from each source element to the field is described by the inner product of a relative source strength vector and a column of the transfer matrix corresponding to that source. Another main concern is the robustness against input noise that should be essentially guaranteed. To this end, the conditioning of the transfer matrix by using the regularization technique and the optimal source positioning by using the effective independence (EfI) method can be employed. This paper demonstrates the applicability of these techniques in the actual field rendering problem.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Katholieke Universiteit Leuven  

Noise characteristic in enclosed space of vehicle such as train compartment, car cabin etc. is very important factor for pleasant riding. The enclosed space has inherently acoustic cavity resonances and therefore if the vibration resonances of surrounding structure are occurred at mutually close frequency range, the resultant noise is enhanced and becomes serious. Such structural vibration is generated through multiple transfer paths from the vibration source such as motor, engine and so on. In this paper a simple box structure is dealt with where 5 walls are rigid expect one wall is flexible with a thin panel which is excited by an electromagnetic exciter through two legs attachment, namely two transfer paths. First the transfer path analysis is applied to identify which path is dominant by use of partial contribution against the acoustic pressure at target position in the enclosed space in the frequency range of interest. In order to suppress such vibration born noise, the dominant input path point of flexible panel should be coincided to the anti-resonance point under consideration. Therefore the anti-resonance sensitivity is utilized to control the position of anti-resonance point due to structural modification. The proposed method is applied to simple numerical lumped mass models for verification and then the actual simple box. The resultant noise can be significantly reduced due to predicted structural modification on the panel. © (2012) by the Katholieke Universiteit Leuven Department of Mechanical Engineering All rights reserved.

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Language：English   Publishing type：Research paper (international conference proceedings)  

Recently, objective and quantitative evaluations for sound impressions by using physiological reaction have been researched. In this research, to investigate comfortable rhythmical sounds, first, we carried out sound quality evaluation by subjective evaluation. Next, we carried out objective evaluation by using salivary amylase activity and heart rate. We prepared evaluation sound which is the operation sound emitted from a Multi Function Peripheral (MFP) that integrates two or more functions such as copying, printing, faxing, or scanning into one device. We also prepared evaluation sounds by editing the measurement data of operation sound from the MFP. Furthermore, we investigated if it is possible to use salivary amylase activity and heart rate to evaluate the effect of rhythmical sound. As a result, it might be stated that it is possible to evaluate the sensation of rhythm by using salivary amylase activity and heart rate. Then, a design strategy on creating rhythmical sound was suggested considering the compatibility of listeners.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

In this paper, focusing on the coupled vibration of light weight vehicle engine and frame, the efficient method to reduce the vibration is discussed. First, target coupling vibration is explained by experimental data. And transfer force identification which transmits from the engine to the frame through the engine mount is carried out using dynamic stiffness method. In order to explain how the engine and the frame are coupling, the coupling index is introduced. The index is defined by inner products of the identified force and the frame FRF. Finally, the method to reduce the coupling index by adjusting the engine mount angle is proposed. The optimal adjustment angle is predicted and modifying the angle in experiment, it is shown that the adjustment method can reduce the coupling index and coupled vibration.

DOI： 10.1299/kikaic.77.3350

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Language：English   Publishing type：Research paper (international conference proceedings)  

In general, the preferred sound environment is varied according to the purpose of space if it is to obtain not only quiet condition but also an increase of productivity in the workplace of comfort in living space. The space possible to offer an appropriate sound condition adapting for the purpose of space (Smart Sound Space) can be considered as one of the desirable form for the residential space of future. As the fundamental technologies to implement the smart sound space, method to monitor the sound field and response of resident, and method to generate the target sound field condition are required. In this study, monitoring method using non-invasive sensors to measure the physiological information of human was employed to observe the physiological reaction of residents against noise condition. The physiological reactions are highly affected on the stress induced by noise environment. The applicability of several physiological information, including facial temperature, saliva amylase, breathing pattern et al., were investigated for a real time feedback system to control noise environment. Moreover, the basic system with triggering by monitoring signal was tested to improve noise environment by combining the monitoring system and controlled loudspeakers using feedback control to suppress or mask the annoying sound field.

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Language：English   Publishing type：Research paper (international conference proceedings)  

For the sound field rendering in an actual listening space, the configuration of the reproduction field is sometimes changed from its initial condition. In addition, various other given conditions including the target position of listeners are usually not specified exactly and, further to this, it cannot be usually fixed at a single area. Such facts would significantly degrade the accuracy of the sound field when rendering it by the inverse approach. To overcome this problem, a robust control method was investigated by focusing on the condition number of the transfer matrix between reproduction system and space. For the robust control, two concepts were considered: First, the stable source condition was obtained by using the regularization for an array system. With this concept, the solution, which is stable against the noise input and consuming low power, could be achieved. Because the information on the noise was not included in this design problem, the optimal regularization parameter could not be specified, but it should be determined by the allowed level of noise amplification. Second, a stable transfer matrix was constructed by considering the resources and the proper arrangement of array. By employing the effective independence method, the redundant sources, which make the system unstable, could be found and eliminated from the source set. Copyright © (2011) by the Institute of Noise Control Engineering.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Springer New York LLC  

The continuously variable transmission, CVT for automobile, which consists of the primary and secondary pulley connected by the steel belt with many thin plate elements inserted in line, is becoming popular because of efficient fuel consumption, smooth variation and acceleration. But due to engagement and disengagement between the pulley and element, a distinctive noise may be generated according to the revolution. In this paper such distinctive noise at specific frequency is confirmed using a test rig of CVT and also the Operational Deflection Shape, ODS of the belt at very limited points is measured due to difficult access of non- contact sensor in the test rig. Then the FE model of the CVT is created and updated to match the FRF calculated and measured. Based on the FE model and measured ODS at very limited points, the excitation force can be assumed during the rotation that causes the ODS and generates the noise. Finally alternative element design is proposed to reduce the distinctive noise and verified by the actual measurement. ©2010 Society for Experimental Mechanics Inc.

DOI： 10.1007/978-1-4419-9834-7_66

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Springer New York LLC  

In this paper, a CAE based approach to understand a behavior of vibro-acoustic system is introduced. The sound pressure at an evaluation point in an enclosure can be described by inner product of (i)an acoustic transfer function from coupling surface to the evaluation point, and (ii)a structural vibration on the coupling surface. By addition of (iii)the correlation angle between above (i) and (ii), the sound pressure can be exactly estimated. In this paper, the correlation (iii) is called Vibro-Acousitc Coupling Factor (VAC). Using VAC, it is possible to understand not only the radiation efficiency, but also the interference of sound at the evaluation point. The proposing method explains the behavior of vibro-acoustic system using the frequency response of (i), (ii) and (iii). As an example, the proposing method is applied to FE model for improving the vibro-acoustic characteristic.

DOI： 10.1007/978-1-4419-9507-0_8

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Language：English   Publishing type：Research paper (international conference proceedings)  

The directional characteristic of the optimal beamformer of a transducer array depends not only on its hardware configuration but also on the stability factor. This parameter can be used to control the directivity of the array. In this paper, a method, which is based on the proper selection strategy of the stability factor, is suggested to control the directional characteristics of the optimal beamformer without changing the array configuration. The selection method of the stability factor was investigated considering the trade-off relation between spatial resolution and noise amplification or array gain. The suggested method was applied to the problems of both microphone- and loudspeaker arrays to obtain a specific directivity pattern of high resolution with a constant beamwidth.

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Language：English   Publishing type：Research paper (international conference proceedings)  

Recently, the number of traffic accidents have increased, partly because of the delay in recognition of danger, caused by decreased of concentration and lack of seriousness. To take steps to prevent the decrease of the driver's attention level, many studies implementing stimulations such as sound have been done. But the conventional evaluation method of being accustomed to hearing sound is subjective. As a result, subjects concentrate on hearing the sound which does not represent reality. Consequently the accuracies of the evaluations are low. In this research, we examined the new evaluation method of being accustomed to hearing sound when the sounds were continuously heard. We assumed that the subject wasn't accustomed to hearing the sound, if the sound attracted subject's attention. First, subjects carried out conventional subjective evaluation with the presentation of four evaluation sounds. Then, the subjects heard four evaluation sounds whose sound pressure levels (SPL) were changed, and were tasked with answering if they recognized the changes in SPL. Simultaneously, the physiological information was measured by using skin potential response (SPR). Then, we examined the results of conventional evaluation, a questionnaire, and that of the new evaluation methods by comparing them. We found that they follow the same trend. Consequently, it was verified that the new evaluation method with task and the evaluation by using SPR can be used to evaluate for being accustomed to hearing the sound. Moreover, the new evaluation method can decrease the effects of the subjects feeling stressed and inaccuracies in the evaluations.

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Language：English   Publishing type：Research paper (international conference proceedings)  

Sound quality evaluation has been conventionally performed by subjective evaluation, such as the SD method and the paired comparison method. But these methods have some problems caused by inter-subject variation of the meaning of the questionnaires. Additionally, it is difficult to evaluate the sound that varies over time in real time. In order to discover solutions to these problems, objective and quantitative evaluation method of human sensation by using physiological information has been researched. However, when physiological reaction is measured, the measurement environments are limited, because precise and large measurement equipment is immobile. There are two types of sounds. The first type of sound is easy to get accustomed to hearing and the sensation is comfortable, and the second type of sound is difficult to get accustomed to hearing and the sensation is uncomfortable, when the sound is continuously heard. In this research, we focused on salivary amylase activity and respiratory depth physiological reactions to realize objective sound quality evaluation. The measurements of salivary amylase activity and respiratory depth are not only mobile, but also the subject does not feel stressed. We evaluated whether the evaluation sounds were easy to get accustomed to and whether the sensation was comfortable by carrying out subjective evaluation, and by using salivary amylase activity and respiratory depth. The evaluation sounds were steady sounds emitted from an air cleaner and a home vacuum cleaner. We also conducted whether the result of the objective evaluations agrees with that of the subjective evaluations. We also conducted whether salivary amylase activity and respiratory depth can be used for the evaluation of the extent to which the subject becomes accustomed to the sound. The result of the objective evaluation almost agreed with that of the subjective evaluation. Therefore it may be stated that it is possible to use salivary amylase activity and respiratory depth to recognize getting accustomed to hearing sounds.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE  

These days, Multi Function Peripheral (MFP) that integrates various functions such as the copy, printer, fax, and scanner into one equipment is advanced. The number of parts of the MFP has increased compared with a machine of single purpose function. Moreover there is a great demand for high-speed and high-resolution MFP, consequently the operation sound becomes noise issue due to the increase in the number of parts, complicated mechanism and speeded up driving parts. As a result, there is a greater call for a more comfortable sound quality in the MFP year and year.
There are many sound sources in the MFP. The operation sounds include steady sound and transient sounds, one of the steady sounds is noise from the motor, and one of the transient sound is collision noise between the paper and the roller. Some methods of sound quality improvement of the MFP have been proposed. However, variation in the sound pressure and in the timing of the transition sounds during the copy process has not been reported. These variations are caused by the parts and the production process uncertainties in addition to deterioration with age over a long period.
In this study, we focused on the rhythm consists of the transient sounds emitted from the MFP during copy process. The variations about the sound pressure and the timing at the transition sounds are measured experimentally. Additionally, the influences of the variations of the time interval between transient sounds of each consecutive cyclic part and between each transient sound in one cyclic part are investigated by subjective sound quality evaluation. As a result, it is confirmed that the variation of the time interval between each transient sound in one cyclic part is dominant to sound quality of the MFP. Finally, the tolerance range of the variation for comfortable sound design can be estimated.

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Language：English   Publishing type：Research paper (international conference proceedings)  

It was intended to establish an objective decision criterion to evaluate the quality of small window motors using the sound quality (SQ) metrics. Although, the motor generates a small sound level, the sound from the abnormal motor, however gives the uncomfortable feeling as well as the impression of abnormal operation. In this study, the correlation between the SQ metrics and the subjective decision of motor quality were investigated. It was observed that the loudness and roughness of the motor sample group which is classified as abnormal was higher than those of the normal motors. We constructed a subjective evaluation index for the motor sound by combination of SQ metrics with proper weightings. The evaluation results on the specimens that were not employed in generating the quality evaluation index showed a good agreement with the subjective test in 73 %.

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Language：English   Publishing type：Research paper (international conference proceedings)  

These days, various safety sensors in vehicles are widespread. And, for warning sounds such as for the trapping prevention of the power slide door of the vehicle, the importance of the warning system for senior citizens, whose audibility characteristic at high frequencies decreases, increases because the warning sound around 4,000Hz is about 25dB different in audibility characteristic between a person in their twenties and in their sixties. Moreover, another issue is that the cognition of direction of the warning sound might be made difficult by the influence of the inside and outside environmental noise, or by the influence of the refraction or the diffraction of sound in the vehicle. In this study, the new methods for the cognition improvement of the warning system and of the specific direction by using the complex stimuli with the auditory sense of sound and the tactile sense of vibration, and by using the complex stimuli with the auditory sense of sound and the visual sense of light are examined. First, the effect of the complex stimuli, using sound and vibration, is evaluated by the paired comparison method of subjective evaluation. Next, the suitable excitation point, frequency and the stimulation time of vibration are examined. Then, the effect of the complex stimuli, using sound and light, is evaluated. Then, the suitable color and the stimulation time of light are examined. Moreover, it is examined if the cognition rate of direction where is different from the sound source position in the vehicle can be improved by using the complex stimuli, using sound and vibration, and using sound and light. As a result, it is found that the cognition of the warning system is improved in the case when the complex stimuli are used compared to when only the simple stimulus with sound is used at the driver's position. Moreover, it is verified that the cognition rate of direction where is different from the sound source position in the vehicle can be improved by adding the stimulus with the tactile sense of vibration or by adding the stimulus with the visual sense of light.

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Language：English   Publishing type：Research paper (scientific journal)  

An airborne ultrasonic transducer is generally required to generate high sound pressure in order to realize precise detection and long-range measurement. The purpose of this study is to analyze the vibration mechanism of a piezoceramic transducer and to indicate guidelines for the optimum structure in order to increase the pressure amplitude. We focus our attention on the peak appearance in the pressure response of the transducer. We then clarify, experimentally and numerically, the sound radiation mechanism from vibrational and acoustical points of view. In this report, we present newly observed vibration modes with two peaks and promising schemes for efficiently increasing the sound pressure amplitude. © 2009 The Acoustical Society of Japan.

DOI： 10.1250/ast.30.404

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Language：English   Publishing type：Research paper (international conference proceedings)  

Recently, objective and quantitative evaluation method of human sensation by physiological information has been researched. However, the sound quality evaluation method under complex stimuli such as auditory sense, visual sense and vibratory sense has not been established. In this research, the sound quality evaluation under complex stimuli of auditory sense of cruising sound and visual sense of projected image using a driving simulator is carried out. Respiration fluctuation of autonomic nervous system is paid attention to interaction between auditory sense and visual sense. As a result, it is confirmed that sound impression of cruising sound is influenced when visual sense is changed. Sound Quality Coefficient (SQC) based on respiration fluctuation has a high correlation with realistic factor of subjective test. Moreover the SQC for suitable evaluation index can be indicated by subjective and objective evaluation under complex stimuli of auditory sense and visual sense.

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Language：English   Publishing type：Research paper (international conference proceedings)  

These days, the evaluation of human sensation by using physiological information has been researched as a quantitative evaluation method of comfort and stress. Sound quality evaluation has been conventionally performed by subjective test, for example Semantic Differential (SD) method and paired comparison method. But these methods have some problems caused by inter-subject variation of the adjectives. Additionally, it is difficult to evaluate time-varying sound of actual machines in real time. In this research, to realize a quantitative sound quality evaluation, the autonomic nerve by the activity of the peripheral nervous system in the biological reaction is paid attention by using respiration fluctuation and variation of face temperature. The quantitative sound quality evaluation by using physiological information often has big data variations caused by small body movement, even if the subjects sit on a chair for the rest state. It is clear that the respiration fluctuation is easy to measure by pressure between human back and seat. Sound Quality Coefficient (SQC) is calculated by the respiration fluctuation eliminated the unique data by a deep breath and body movement. When subjects evaluate comfortable sound and extremely unpleasant noise, the SQC has a high correlation with comfortable factor and realistic factor of subjective test. Also, it is clear that variation of the face temperature is easy to measure by thermography. The variation of the face temperature has a high correlation with comfortable factor and realistic factor of subjective test. Finally, it is confirmed that quantitative sound quality evaluation can be achieved by the respiration fluctuation and the variation of the face temperature.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE  

Electric motors are widely used in information device, home electric, industry, etc. The technical demands on motor nowadays should meet not only compact, high power and efficiency but also less noise and vibration. In this study, a simple plate and an electromagnet are used to measure the magnetic flux density and the plate vibration. Also the electromagnetic analysis model is used to calculate the electromagnetic excitation force that loads on FE plate model to predict the vibration for verification. Then an axial gap type brushless DC motor is dealt with for actual application. The predicted magnetic flux density based on electromagnetic analysis model of the motor is confirmed by measured data. Finally structural modification to change the FRF of rotor component is applied and the noise improvement is achieved under operating condition.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：交通工学研究会  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE  

In order to design the sound quality in interior and exterior space of a car and improve the vibration comfort, the identification of excitation force generated from the engine is very important and inevitable. Since the direct identification of force under operating condition is difficult to conduct, the indirect identification based on FRF measurements, that is, the inverse FRF times the response result the force, becomes popular but requires the excitation at force generation points such as main bearings, which is very hard to install the exciter. As alternative way, by use of reciprocity, the FRF may be replaced by exciting the monitoring response point and detecting the response at force generation point. But it is still very time consuming to excite several points.
Instead of that, the ordinal modal testing in which only a few easy access point are stationary excited while many responses can be measured within short time and a little effort, is expected to predict the FRF between the force generation point and the monitoring response point under operating condition. After curve fitting, the prediction is possible so called as synthesized FRF. However in high frequency range, the curve fitting only provides very limited number of mode and the synthesized FRF may be far from the correct one especially at frequency valleys that are very sensitive to be inverted in force identification process.
In this paper a new approach is proposed in which the number of mode is successively expanded in the vicinity of high frequency range of interest and the differences of synthesized FRF during such expansion are taken into account to determine the appropriate monitoring response points. This approach is verified by a numerical FE and experimental model of T plate and finally an actual V6 automobile engine is tested to identify the excitation force.

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Language：English   Publishing type：Research paper (international conference proceedings)  

Recently, precision information appliances such as a high brightness and thin-shaped television and so on tend to reduce internal space in miniaturization and high-density packaging. Since the heat capacity is increased drastically, several small size fans for forced air-cooling are equipped. The high-speed rotation fans of large air volume often make unpleasant blade passing noises under audiovisual environment. The purpose of this research is to predict and reduce the noises from the fans. First, the fan noise is attempted to model static dipole sound source for noise radiation prediction based on the fluid-acoustic similarity law. The calculation cost by Computational Fluid Dynamics (CFD) is so expensive that the fan noise is tried to replace by a simple vibration plate. Internal acoustic mode shapes can be calculated by the proposed vibration plate model correctly. It is also possible to predict radiation noise from the fan and cut down the calculation cost enough. Moreover, reduction methods of the radiation noise are proposed that acoustic natural frequencies of the internal space are modified not to correspond with the blade passing frequencies by means of appropriate position of ventilation openings, internal partition plates, fans, or absorbing materials.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE  

In order to make good use of micro devices of small size and lightweight such as MEMS, DVD pickup actuator, etc., the dynamic behavior should be considered. However due to the difficulty of measuring FRI's with conventional exciter because of additional constraint and mass by its armature and load cell, the extended modal analysis such as structural modification, sensitivity analysis, may not be utilized.
Therefore a very small electro-magnetic exciter, so called micro exciter of coin size, is developed and used to measure FRFs for micro devices. First compared with conventional exciter, the advantage of micro exciter is revealed to apply small size and lightweight structures. Next how the micro exciter is useful to measure FRFs and conduct structural modification is verified by applying to MEMS like structure numerically and experimentally. Finally a DVD pickup actuator is tested and a structural modification when the optical lens becomes heavier can be properly predicted.

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Language：English   Publishing type：Research paper (international conference proceedings)  

It is necessary to take into account not only machines noise but also water induced noise in a living environment such as toilet, bath and kitchen. A tank less toilet without storing water can be reduced installation space in a toilet room, however it becomes a noise problem in a living environment. Since the tank less toilet is equipped a discharge nozzle for flushing of high water pressure, the flushing sound is especially high sound pressure compared with ordinary type. So this paper describes the improvement of sound quality of the toilet flushing sound based on sound quality evaluation. An acrylic experimental model of toilet is made for taking pictures of the flushing mechanism by a high-speed video camera. The cause of making the flushing sound is investigated with many kinds of nozzles experimentally. It is found that many bubbles involved and burst in water current generate the flushing sound. So the relationship between bubble conditions and sound pressure or sound frequency characteristics are studied. On the other hand, sound quality evaluation of the toilet flushing sound by SD method is carried out to estimate a comfortable sound. As psychoacoustic parameters such as Loudness, Sharpness are introduced, the correlation between subjective evaluations and metrics can be estimated. Moreover the relationship between metrics and design parameters of the nozzle shape can be found. Finally, comfortable flushing sound can be created by structural modification of the nozzle in consideration of sound quality evaluation and washing performance.

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Language：English   Publishing type：Research paper (international conference proceedings)  

A MD device, as AV device mounted on automobile, causes reading error because the optical pickup misses the data on MD due to external body vibration. This paper describes that the cause of reading error depends on the gap vibration at high frequency range in spite of sinusoidal input at low frequency using actual MD device. Next a new method is proposed to identify the location of objective gap among possible gaps by good use of real time animation in time domain based on responses with and without gap vibration. Also a simple plate is used to verify the effectiveness of proposed method. Then a new design method is proposed to prevent the vibration at optical pickup of MD device from the gap vibration at identified location. First the gap itself is changed smaller and thus an great improvement of reading error can be achieved. On the one hand, mode shapes at high frequency range to contribute the gap vibration are identified and sensitivity analysis in terms of vibration amplitude is applied to point out the sensitive part for mass structural modification, which can improve the gap vibration and furthermore the reading error. A simple plate model is also used to verify the proposed design improvement against gap vibration and finally the reading error of the MD device is actually improved.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD  

This work has been undertaken principally with an idea to improving the dynamic performance of rotorshaft systems, which often suffer from two major problems (a) resonance and (b) loss of stability, resulting in excessive vibration of such systems. Polymeric material in the form of sectors has been considered in this work as bearing supports. Polymeric material has been considered in this work as both stiffness and loss factor of such materials varies with the frequency of excitation. Stiffness and loss factor have been found out for the proposed support system comprising of polymeric sectors. Depending upon the frequency of excitation the system matrix, in this case, changes and dynamic performance of the rotor-shaft system also changes accordingly. Here in this work avoidance of resonance and application of optimum damping in the support have been investigated by finding out the optimum dimension, i.e., the optimum thickness and optimum length of the sectors. It has been theoretically found that use of such sectors reduces the rotor unbalanced response, increases the stability limit speed for simple rotor-shaft systems and thus improves the dynamic characteristics. Parameters of the system have been presented in terms of non-dimensional quantities. Many examples have been presented in support of the conclusion. The life of such supports, particularly in the presence of chemicals and other reagents has not been investigated. (C) 2002 Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0022-460X(02)01081-7

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Language：Japanese   Publisher：Turbomachinery Society of Japan  

DOI： 10.11458/tsj1973.31.287

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

AMD device, as AV apparatus mounted on automobile, causes reading error to miss the data on MD by optical pickup due to external body vibration. This paper describes that the cause of reading error depends on the gap vibration at high frequency range in spite of sinusoidal input at low frequency using actual MD device. Next a new method is proposed to identify the location of objective gap among possible gaps by good use of real time animation in time domain based on responses with and without gap vibration. Also a simple plate model is used to verify the effectiveness of proposed method.

DOI： 10.1299/kikaic.68.3465

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

DOI： 10.20697/jasj.58.7_406

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Language：English   Publishing type：Research paper (international conference proceedings)  

The virtual vibration simulator using a part of the system is utilized to experience the vibration for bodily sensation under actual operating condition before the total system is available. In order to evaluate the effects of structural modification of initial system, a new method is so developed as to predict the modified system FRF based on the hybrid component of the simulator part and FE model for modification part together with the component of the rest of system. First a numerical model is used to verify the proposed method. Then a simple actual structure is used to prove the effectiveness. Finally the method is applied to a steering of truck to generate the vibration under operating condition before and after structural modification, which is realized by three electromagnetic exciters. As a result, one can evaluate the effects of structural modification even when a pad of the system is available at early design stage.

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Language：English   Publishing type：Research paper (international conference proceedings)  

The identification method should be developed to find out the location of rolling bearing defects in rotating machinery especially when many rolling bearings in the same type under correlated rotating speed are used. By using a simple rotating machinery test rig driven by one motor with one shaft supported by two bearings or two shafts through gears by four bearings, it is confirmed that the response, for example, acceleration rms value measured at the bearing location by acceleration pick up is not enough to be able to identify the defects at the associated bearing due to structural dynamics. Thus the FRFs between the excitation force at the bearing location and the response at the measurement point are utilized to predict the identified force due to bearing defects by use of pseudo inverse technique. Then the identified force rms value provides a measure to allocate the bearing defects. Furthermore the appropriate placement of acceleration pick ups even in limited number can be discussed by taking into account the FRF rms value and verified by the test rig.

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Language：English   Publishing type：Research paper (international conference proceedings)  

In vehicle design, the virtual vibration simulator, in which a part of vehicle is used to generate the vibration under operating condition, is widely utilized to evaluate the comfort of the vehicle for bodily sensation. However in order to grasp the operating condition, the real total vehicle is necessary to be tested. In this paper, a scaled model is therefore used to understand the operating condition instead of real vehicle test with time consuming and high cost. First a simple plate structure is tested to verify the proposed method how the virtual vibration simulator can generate the objective vibration. Then by making good use of a scaled model of truck, one can experience the operating condition when the truck runs on concrete, gravel or bump road through only the truck steering part. Furthermore the pictures taken by CCD camera installed on the scaled are projected to provide more realistic evaluation.

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Language：English   Publishing type：Research paper (international conference proceedings)  

In case of uniformly distributed damping, the system can be expressed as real mode shapes and therefore the prediction of structural modification can be achieved with high accuracy. However in case of un-uniformly distributed damping, such as automobile suspension consisted of link, bush, the system should be expressed as complex mode shape, resulting less accurate prediction. In this paper, a numerical model is used to reveal the cause of such inaccuracy and then new algorithms are proposed to improve such inaccuracy. Finally by using proposed algorithm, an accurate vibration model of actual automobile suspension is obtained to be able to predict the change of vibration after structural modification.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Acoustical Society of Japan (ASJ)  

DOI： 10.20697/jasj.56.10_705

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Acoustical Society of Japan (ASJ)  

DOI： 10.20697/jasj.56.6_437

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society for Precision Engineering  

In case of uniformly distributed damping, the system can be expressed as real mode shapes and therefore the prediction of structural modification can be achieved with high accuracy. However in case of un-uniformly distributed damping, such as automobile suspension consisted of link, bush, the system should be expressed as complex mode shape, resulting less accurate prediction. In this paper, a numerical model is used to reveal the cause of such inaccuracy and then new algorithms are proposed to improve such inaccuracy. Finally by using proposed algorithm, an accurate vibration model of actual automobile suspension is obtained to be able to predict the change of vibration after structural modification.

DOI： 10.2493/jjspe.66.801

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Other Link： https://jlc.jst.go.jp/DN/JALC/00066097037?from=CiNii

Language：English   Publishing type：Research paper (international conference proceedings)  

This paper describes the identification and improvement on picture image disturbance of a CRT(Cathode Ray Tube)display caused by vibration of AG(Aperture Grille),which consists of a large number of slit tapes located behind panel display, due to external vibration or sound pressure generated by attached speakers. First the mechanism of such disturbance is identified by a good use of experimental modal analysis for CRT components using Laser Doppler Velocitymeter. For the improvement on the disturbance , a thin wire called damper wire is tensed on AG. But the design to determine where the damper wire should be tensed and how the tension should be applied is conducted by designer's experiences at present . Therefore the damping effect of damper wire is validated experimentally for current design. Then a FE model is created to find the optimum design for suppression of the disturbance.

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Language：English   Publishing type：Research paper (scientific journal)  

The virtual vibration simulator using a part of the system is utilized to experience the vibration for bodily sensation under actual operating condition. In order to evaluate the effects of structural modification on the virtual vibration simulator, a new method is so developed as to predict the modified system frequency response function based on the hybrid component of the part and FE model for modification part together with the component of the rest of system. After being verified by simple structure, the method is applied to a steering of truck to generate the vibration under operating condition before and after structural modification, which is realized by three exciters. © 2000, The Japan Society of Mechanical Engineers. All rights reserved.

DOI： 10.1299/kikaic.66.1462

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Language：English   Publishing type：Research paper (scientific journal)  

Noise from rotating tire is studied by not only running on a road or drum test but also numerical simulation, however it is not clear to find the cause of noise generating mechanism and take prompt measures. In this research, a vibration deformation is predicted by sound radiation from a rotating tire under constant speed and the noise reduction is carried out by structural modification. First, the contribution of each vibration mode shape is estimated by using modal analysis and boundary element analysis and verified by numerical simulation. Next, the proposed method is applied to a rotating tire to predict the vibration deformation at some frequencies of the noise problem. The advantage of this method is as non-contact measurement and to obtain the contribution of each vibration mode shape. Finally, the highest contribution of the vibration mode shape is focused for structural modification to reduce the noise of the rotating tire. © 2000, The Japan Society of Mechanical Engineers. All rights reserved.

DOI： 10.1299/kikaic.66.3874

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Society of Photo-Optical Instrumentation Engineers  

The dynamic behavior of micro-machine, such as scanner unit of STM (Scanning Tunneling Microscope) should be accurately analyzed to realize a motion in high precision and speed. However it is difficult to conduct experimentally or numerically because of the requirement of extremely sophisticated measurement or very precise numerical model. In this paper, a new method is proposed to combine the advantage of accurate noncontact measurement using popular Laser Doppler Velocitymeter with that of Finite Element modeling. The method can predict the dynamic behavior at unmeasurable part of micro-machine, for example, a probe of scanner unit driven by piezo actuators, based on measurement data at limited and measurable points. A numerical model and simple structure are used to validate the proposed method and finally a scanner unit of STM is applied to show the effectiveness.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SEM  

The dynamic behavior of micro-machine, such as scanner unit of STM (Scanning Tunneling Microscope) should be accurately analyzed to realize a motion in high precision and speed. However it is difficult to conduct experimentally or numerically because of the requirement of extremely sophisticated measurement or very precise numerical model. In this paper, a new method is proposed to combine the advantage of accurate noncontact measurement using popular Laser Doppler Velocitymeter with that of Finite Element modeling. The method can predict the dynamic behavior at unmeasurable part of micro-machine, for example, a probe of scanner unit driven by piezo actuators, based on measurement data at limited and measurable points. A numerical model and simple structure are used to validate the proposed method and finally a scanner unit of STM is applied to show the effectiveness.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SEM  

The purpose of this research is the reduction of relative motion between two locations of main functional part of precision device under various conditions. First, sensitivity analysis is described which takes only one location, relative or objective frequency band into consideration in conventional method. Next, a new sensitivity analysis is proposed to consider not only objective frequency band but also relative motion. The new method is applied for a simple numerical model and experimental model, and structural modification is carried out for the reduction of relative motion to compare of conventional methods. Moreover, relative motion between objective lens and stage that are main functional part in a microscope for inspection of large scale integration circuit is analyzed by new sensitivity method for reducing relative motion in low frequency band. The image deflection can be reduced by structural modification and evaluated using two dimensional position sensor qualitatively.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

A vibration simulator was utilized to evaluate the dynamic characteristics of a complicated mechanical system, which requires the total structures to be available. However, in the design stage, only one component is generally under consideration to improve the system dynamics. Therefore, it is useful to develop a hybrid vibration simulator using only the ready-made component which is called a real substructure, as if it behaves as in the total system. In this work, a hybrid model is built by the substructure synthesis method using the FE component model which was obtained by numerical analysis using the finite element method without a real structure, and an experimental model which was obtained by experimental modal analysis of the real substructure. This hybrid model was reduced to the degree of freedom of the connecting point, and we determined a few deciding numbers of excitation and excitation location based on the error ratio and by computing the virtual transmitted force. The real substructure was excited by a hybrid vibration simulator for realizing the vibration behavior in a total system with a modified excitation force, which compensated for the electrical and mechanical characteristics of the vibration simulator.

DOI： 10.1299/kikaic.63.4134

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Language：English   Publisher：IUTAM-IITD  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

In order to suppress structure borne sound, it is very important to analyze the vibration behavior of a machine. Accelerometers are commonly used in measuring the vibration behavior; however, the weight of those prevents the user from obtaining accurate results. In this paper, sound pressure distribution measured by microphones is utilized to predict the vibration behavior as noncontact measurement. The relation between the vibration and sound pressure can be expressed using boundary element method. Simple prediction of the vibration behavior can be achieved using measured sound pressure distribution caused by structure borne sound and a vibration-sound pressure transformation matrix. The proposed method is validated by numerical simulation and experiment at natural and off-natural frequencies.

DOI： 10.1299/kikaic.63.417

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：精密工学会  

The purpose of this research is the reduction of relative motion between two locations of main functional part of precision device under various conditions. First, sensitivity analysis is described which takes only one location, relative motion or objective frequency band into consideration in conventional method. Next, new sensitivity analysis is proposed to consider not only objective frequency band but also relative motion. The new method is applied for a simple numerical model and experimental model, and structural modification is carried out for the reduction of relative motion to compare of conventional methods. Moreover, relative motion between objective lens and stage that are main functional part in microscope for inspection of large scale integration circuit is analyzed by new sensitivity method for reducing relative motion in low frequency band. The image deflection can be reduced by structural modification and evaluated using two dimensional position sensor quantitatively.

DOI： 10.2493/jjspe.63.55

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Other Link： https://jlc.jst.go.jp/DN/JALC/00043942404?from=CiNii

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SEM  

Modern precision audio visual equipments are demanded to design as quiet as possible under operation. For example, eject motion for video cassette of an 8 mm VTR causes unpleasant transient noise. In order to solve such noise problem, transient analysis on vibration and noise is required because the input forces and furthermore structure configuration are varying in short time, which results a change of FRF. As a preliminary study, two plates, which connect with arbitrary angle, is used to investigate the change of FRF and further the responses of vibration and noise due to input force. Structural modification technique is so valid as to suppress such noise if some FRFs are measured with respect to the angle. Finally an actual 8 mm VTR is tested and transient analysis on vibration and noise during eject motion is applied to utilize structural modification.

Scopus

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

DOI： 10.1299/kikaic.62.955

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本機械学会  

DOI： 10.1299/kikaic.61.2882

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：精密工学会  

DOI： 10.2493/jjspe.61.213

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Total pages：552   Responsible for pages：372-380   Language：Japanese   Book type：Scholarly book

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Total pages：196   Responsible for pages：1-15,79-113   Language：Japanese   Book type：Scholarly book

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Total pages：106   Responsible for pages：96-99   Language：Japanese   Book type：Scholarly book

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Total pages：1071   Responsible for pages：24,27-30,237-250,336-359,537-555,962-983,1056-1059   Language：Japanese   Book type：Scholarly book

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Total pages：92   Responsible for pages：40-41   Language：Japanese   Book type：Scholarly book

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Total pages：8   Responsible for pages：4-5   Language：Japanese  

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Responsible for pages：2097-2102   Language：Japanese  

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Total pages：231   Responsible for pages：28-30   Language：Japanese   Book type：Scholarly book

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Responsible for pages：148-151   Language：Japanese  

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Total pages：214   Responsible for pages：152-154   Language：Japanese   Book type：Scholarly book

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Total pages：208   Responsible for pages：150-156   Language：Japanese   Book type：Scholarly book

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Total pages：116   Responsible for pages：57-60   Language：Japanese   Book type：Scholarly book

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Total pages：142   Responsible for pages：110-111   Language：Japanese  

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Total pages：157   Responsible for pages：1-157   Language：Japanese   Book type：Scholarly book

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Responsible for pages：437-440   Language：Japanese   Book type：Scholarly book

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Total pages：1017   Responsible for pages：485-533   Language：Japanese   Book type：Scholarly book

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：ゴルフダイジェスト社  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：OHM  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：銀行倶楽部  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Institute of Noise Control Engineering of Japan  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：The Acoustical Society of Japan  

DOI： 10.20697/jasj.72.7_420

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：中央大学父母連絡会  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：The Yomiuri Shinbun  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Society of Automotive Engineers of Japan  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Society of Automotive Engineers of Japan  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：養賢堂  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In case of input location varying machine such as planetary gear transmission, the noise is varied in function of rotating angle. The time domain Transfer Path Analysis can be utilized to investigate the path contribution. A simple model is used to verify and apply the path modification for vibration and noise reduction.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The vibration power generator is strongly desired to provide distributed local power supply. But the problem is small power at off resonance frequency. Therefore multiple degree of freedom vibration power generator is designed to improve generation efficiency for wider frequency range.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In this research, the effects of oar vibration on boat speed and comfort in rowing were evaluated. First, the significance vibration difference by two types of boat oar to the handle part was observed by modal analysis. And then, the oar vibration transferred to the front end of a boat on the feature when turning oar blade in rowing. Therefore, it was clarified that the relation between the boat speed by GPS and the boat vibration had a negative correlation. Secondly, the boat vibration by two types of boar oar was different, and then the large catch vibration by a type of oar was observed. Finally, it was clarified that the vibration effects on the comfort in rowing by a subjective evaluation on the simulation test by using a shaker.

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

CiNii Books

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Language：Japanese   Publisher：電子情報通信学会  

Ultrasonic cleaning tanks are generally of three-dimensional shape. Present work aims at obtaining useful information for design and evaluation of practical ultrasonic cleaning tanks via a finite element simulation approach. Sound pressure distribution in the liquid bath, which is surrounded by the vibration plate walls, is then considered as three-dimensional model in which the coupled between the elastic plate vibration and the sound pressure in the liquid is taken into account. Then, using the coupled fluid-plate model, three type cleaning tanks are analyzed and the results of sound pressure distribution are verified with the measured. Also the experimental observation of the sound pressure distribution pattern is shown, in which an aluminum foil inserted in the field is eroded. These numerical results are compared with the experimental results wherever they are available.

CiNii Books

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Language：Japanese   Publisher：電子情報通信学会  

Present work aims at obtaining useful information for design and evaluation of practical ultrasonic cleaning tanks via a finite element simulation approach. In general practice, a vibrator is installed directly to the bottom plate of the cleaning tank to form the radiator. Sound pressure distribution in the liquid bath, which is surrounded by the vibrating plate walls, is then considered as an axisymmetric model in which the coupling between the elastic plate vibration and the sound pressure in the liquid is taken into account. Then, using the coupled fluid-plate model, the cleaning tank is analyzed and the effect of the existence of the object to be cleaned is calculated and the results of the sound pressure distribution are verified with the measured. Also the experimental observation of the sound pressure distribution pattern is shown, in which an aluminum foil inserted in the field is eroded in the regions corresponding to high pressure due to the activation of cavitation. These numerical results are compared with the experimental results whenever they are available.

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Institute of Noise Control Engineering of Japan  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Society of Automotive Engineers of Japan  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Society of Automotive Engineers of Japan  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Institute of Noise Control Engineering of Japan  

CiNii Books

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Language：Japanese   Publisher：日本道路協会  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：Japanese   Publisher：映像情報メディア学会  

DOI： 10.3169/itej.66.379

CiNii Books

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Language：Japanese   Publisher：カルソニックカンセイ株式会社  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In our previous study, we focused on a vehicle suspension as a promising application target of a compliant mechanism and proposed a design method for a vehicle suspension based on a compliant mechanism, or a compliant suspension. In order to design a compliant suspension that satisfies design requirements of a practical vehicle suspension, such as stroke length, camber angle, roll center height and lateral rigidity, our two-stage design method that consists of topology and shape optimization was expanded. In the 1st stage or topology optimization stage, an objective function is modified to evaluate lateral rigidity, which enables to generate an initial concept of a compliant mechanism having high flexibility in a vertical direction, which is a main function of a vehicle suspension, and high rigidity in a lateral direction. In the 2nd stage or shape optimization stage, suspension stroke and camber angle are handled as objective functions, whereas stress constraint, roll center height and lateral rigidity are handled as constraint functions, which yields optimal shape of a compliant suspension. In this paper, we now focus on vibration characteristics of a compliant suspension because the main functions of a vehicle suspension are improving ride quality and running stability by absorbing vibration from road surface while running and vibration characteristics of a vehicle suspension greatly influences ride quality and running stability. Therefore, in this paper, we desgined a compliant suspension using the proposed method and analyize its vibration characteristics.

CiNii Books

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Language：Japanese  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper describes the robust design method base on CAE. In initial design stage of mechanical design, the advantage of the conventional method, Monte-Carlo method, Taguchi Method etc, is limited. Because it is need to define the noise factors as a known quantity. In this paper, novel approach which can be applied to initial design stage is proposed. The basic idea is that the noise factor is not design parameter (ex, machine component shape, stiffness of weld), but characteristic of system (ex, the interference of sound, particle velocity). In this paper, the basic idea is applied to simple FE model.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

To reduce interior low frequency noise of a vehicle cabin, damping materials are utilized with low cost and minimum place. But, the panels with high damping interior material and high vibration mode density make matters more difficult to identify the place contributing to the interior noise. In this paper, an optimal local placement of the material considering relative phase between vibration and sound is proposed. In addition, separation of closely coupled vibration modes is proposed by good use of phase controlled multi-input.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The vibration and noise of automobiles by lightening might cause decreasing the product value. In this study, an improvement of the door closing sound of lightened door and a structural modification of the door outer panel were investigated in consideration of human sensibility. To forecast by CAE easily, a series of verifications was done with a simplified door experiment model. Acoustic sensitivity analysis was used to detect an effective position for structural changing. Finally, an actual door closing sound was designed to a pleasant sound.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

When a structure has multiple part connection uncertainty such as bolt fasting torque, the FE model of the structure becomes very complicated to apply Monte Carlo simulation for vibration robust design. In this paper, instead of investigating every uncertainty by changing fasting torque, only the relative mode amplitude at the part connection is deal with. A simple joint plate model is used to confirm the proposed method.

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：リバネス出版  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Amid ongoing super-aging society, the introduction of portable medical equipment is promoted with the expanse of patient's activities. As a result, this study will focus on noise and vibration of the portable medical equipment with air compressor, and investigate the effects on the human body and surrounding environment.

CiNii Books

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Language：Japanese   Publisher：自動車技術会  

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Language：Japanese   Publisher：自動車技術会  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The sound pressure of the belt noise is measured and the operational deflection shape is investigated at specific rpm. Then the modal testing is carried out to obtain the natural frequencies and mode shapes and the mode contribution can be analyzed. Based on FE model, the shape modification of belt element is considered for noise improvement.

CiNii Books

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Language：Japanese   Publisher：日本音響学会  

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DOI： 10.20697/jasj.64.9_571

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Recently, it is necessary to give the additional value to a basic performance of the equipment to be lost of a remarkable difference. Then, it focus on the shutter sound of the camera in this research. It aims to give the quality of sound as an additional value by making comfortable shutter sound. In aiming at making comfortable shutter sound, sound quality evaluation is used. However, when the sound quality evaluation is repeated whenever the sound is changed by a simulation and a structural modification. Then, the regression in a sound quality evaluation result and psychoacoustic parameters is made by using regression analysis. Whether it is possible to provide the directionality of sound quality is verified without sound quality evaluation.

CiNii Books

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Language：English   Publisher：自動車技術会  

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Language：English   Publisher：自動車技術会  

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Language：English   Publisher：自動車技術会  

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Language：English   Publisher：自動車技術会  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Correlations between variance of motor excitation force, distribution of base structural property, and SPL of simple hard disk drive are investigated. In validation, indirectly identified force is used to clarify these correlations. And noise and vibration reduction by structural modification at motor component is proposed. In addition, correlations between assembly specification, excitation force, and SPL of motors are researched by using bracket motor model. Simulation model is also used to predict variance of vibration noise of bracket motor model.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In recent vehicle industry, the quiet interior sound when running is one of the additional values. At present, the attention treads from the overall sound to the existence of a local sound and further improvement for quietness is aimed. In this paper, the door seal that is one of the factors when exterior noise is transmitted into interior is focused and the prediction of interior sound is conducted experimentally.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

According to increase of the long time and distance driving, reduction of the noise in cabin is problem as one of the comfort improvement in truck cabin. Many of causes of noise in cabin are vibration (structured borne noise) and emission sound (air borne noise) from engine. Noises for the frequency range about 200-500[Hz] causes air borne are difficult to solve. In this research, by paying attention to vibration characteristic of floor panel that separates engine room and cabin, a structural changing method that can reduce interior noise efficiency is established.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper suggests the identification technique of difference of exciting force in order to evaluate tire road noise due to difference of road surface. First, the vibration state of the object is calculated by use of inverse numerical acoustics from the near-field noise date because it is difficult to measure directly the vibration state of the moving tire. Second, the exciting force is identified from the calculated vibration state and the vibration characteristics of the object.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Vibration uncertainty due to the uncertainty of parameter can be estimated by using Monte Carlo Simulation. This method enables to choose the most efficient parameter to reduce vibration uncertainty in analysis. Consequently, quality and cost can be designed at the early stage of designing. This paper focuses on the uncertainty of relay joint. At first, reduction of vibration uncertainty is attempted using simple model. And then, the effectiveness of this method is confirmed by application of actual model.

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：日本騒音制御工学会  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Recently, global warming becomes serious problem all over the world. One reason for the greenhouse gas is CO2 in the exhaust gas from automobile. It is necessary to develop high- efficient engine such as hybrid system using internal combustion engine and electric motor or only electric motor. The purpose of this research is to analyze the sound quality of electric vehicles and to estimate their positions among conventional internal combustion engine vehicles. First, subjective evaluations of internal combustion engine and electric vehicle in the case with train and without it are examined by semantic differential method. Then, the specific factors of both cases are extracted by factor analysis. Moreover, the sound quality of the electric vehicle is characterized for next-generation.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Recently, a new added value in addition to a basic performance of a switch for automobile is expected. The purpose of this research is to pay attention to comfortable switch sound in consideration of tactile feeling. First, subjective evaluations of the tactile feeling of the switch and its operation sound are examined by semantic differential method. Then, the common specific factors between the tactile feeling and the operation sound are extracted by factor analysis. Moreover, the specific factors and physical properties such as the input force and its sound pressure level are analyzed to estimate the relationship between subjective evaluation and objective evaluation.

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：日本騒音制御工学会  

DOI： 10.11372/souonseigyo1977.31.210

CiNii Books

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Other Link： https://jlc.jst.go.jp/DN/JALC/00295425267?from=CiNii

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Recent years, automatic transmission in car is prevailed excellent for safety, and comfort. Planetary gear with complicate behavior is used in gear mechanism and may cause a noise at specific frequency. It is very difficult to measure the vibration directly because of narrow space however it is desired to measure the vibration indirectly to understand the behavior of the Planetary gear. This paper describes the technique for prediction on vibration behavior of Planetary gear that cannot be measured the directly.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

First, The correlation of the subjective evaluation and sound metrics is taken into account for shutter sound. And the target that considers person's sensibility is decided. Next, kinematic analysis is performed. The data obtained in kinematic analysis is brought to acoustic analysis, and sound is created. Finally, the sound made from acoustic analysis is evaluated, and design on comfortable sound is achieved.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In this paper paying attention to the automobile seat and riding person, technique of acoustic analysis on acoustic material is examined based on the hybrid method of the experiment and the analysis. These are concretely analyzed by setting acoustic impedance to the boundary condition. Finally, sound field of semi-anechoic room assumed as automobile interior can be designed by development of acoustic model for automobile interior in consideration of automobile sea and riding

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Natural frequency of each motor component and electromagnetic field in axial gap type fan motor are investigated by modal analysis and measurement of magnetic flux density under operating condition. And, electromagnetic excitation force reproduced by using electromagnetic field analysis and structure analysis are used to predict vibration response under operating condition. In addition, noise and vibration reduction by structural modification in component of motor is proposed.

CiNii Books

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Language：Japanese   Publisher：日本音響学会聴覚研究委員会  

CiNii Books

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Language：Japanese   Publisher：三菱電機エンジニアリング株式会社  

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Language：Japanese   Publisher：日本騒音制御工学会  

CiNii Books

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Language：Japanese  

J-GLOBAL

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Language：Japanese   Publisher：渋沢栄一記念財団  

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Society of Automotive Engineers of Japan  

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Based on the measurement of distal leg linear speed, a numerical model of stretch reflex response is created. The hammer input force is transferred into quandiceps and biceps force through nerve system. Then through leg system the absolute velocity can be predicted. By adjusting gains and delays of nerve and leg system, various velocity wave form can be generated for further investigation of stretch reflex response.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Based on repeated FRF measurements, the parameter uncertainty can be determined in function of resonance frequency sensitivity with respect to bolt spring stiffness. A new method is proposed to reduce such uncertainty by use of amplitude sensitivity. A simple beam model and real automobile suspension are applied to verify the new method for robust vibration design.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The car interior sound can be categorized into transmitted, structural and reflect noise and influenced by glass. First comfortable sound can be defined by SD method and sound metrics. The influence by glass is verified by real car test and a simple model with respect to boundary condition change. A numerical coupling analysis of glass vibration and interior sound field is carried out to reveal the reason for improvement.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The Highly-accelerated Life Test (HALT) becomes popular to design the destruct margine in life test. But due to the directionality of breakage of product, an uniform excitation is necessary to guarantee the accuray of test. In this paper, a new approach is proposed to find the optimal dimension, excitation timing and excitation angle. Numerical FE models and actual plate are used to verify the approach.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The machine diagnosis based on vibration measurement and analysis faces the new practical phase of signal analysis method that is superior to aural objectivity by good use of advanced signal analysis technology. The defective gear existed in the rotating machine as a diagnosis target can be identified by the feature quantity of each factor and the overall judgment should be needed. In this paper the determination method for the best vibration sensor position in the diagnosis is purposed and the relation between the vibration characteristic of various defective gears and the extracted feature quantity is grasped. Also it is concluded that the dynamic characteristic of gear device should be taken into account.

CiNii Books

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Language：Japanese  

CiNii Books

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Language：Japanese  

J-GLOBAL

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The conventional force identification is carried out to measure the vibration responses under operation multiplied by the inverse of the FRF matrix between excitation point and monitoring point beforehand. However this FRF matrix measurement becomes time and cost consuming. In this paper a new technique is proposed by good use of synthesized FRF based on ordinary modal testing. In order to determine the optimum monitoring points, a new index is defined and successfully applied to numerical and experimental modal.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Under operational condition of orbit scroll type compressor, a transient vibration and noise are apt to be generated due to collision between fixed and rotating orbit scroll surface with narrow clearance, which causes relative transient force. In order to reduce such vibration and noise, where and how the relative transient force is generated should be identified. By using a simple model, the relative transient force can be identified in time domain by inverse relative FRF matrix multiplied with response under operational condition. Then the method is applied to actual orbit scroll type compressor.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Hybrid Testing Method is becoming a powerful tool to be able to evaluate experimentally the dynamic behavior of a component when assembled into the system, based on modal model of the component and FE model of the rest. However the accuracy of driving control to generate the objective vibration is much influenced by nonlinearity such as gap vibration. Therefore a new compensation method is proposed and successfully applied to a simple vehicle model.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In recent years, blurred image by hand vibration has been a problem due to increased magnification of a digital camera. Since the conventional blurred compensation is performed by only the gyroscope sensors, it is only valid for rotation vibration. However the actual hand vibration includes not only the rotation but also the displacement vibration. In this paper, how to locate the optimal displacement sensors and to compensate the blurred image are discussed using actual digital camera.

CiNii Books

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Language：Japanese  

CiNii Books

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Language：Japanese  

CiNii Books

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Language：Japanese  

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The technique for quantifying stretch reflex allowing multi degree of freedom movement was developed. Measurements are made from a triaxial accelerometer and an instrumented hammer with force sensor system. Stretch reflex dynamics were estimated using the recorded tapping force and the lower leg velocity. The input-output properties of system relating the reflex velocity were characterized using several measures : time delay (Td), reflex acceleration time (Ta), peak leg velocity (Vp), peak tapping force (Fp), peak reflex velocity-peak tapping force ratio (Vp/Fp). These parameters showed repeatability and to help characterize neuromuscular dynamics of stretch reflex. This technique may be also utilized as an educational tool in the medical field.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In this paper, it aimed at the thing to propose the prediction method of noise and vibration in a ferroconcrete structure by using Statistical Energy Analysis (SEA) from test/analysis Frequency Response Function (FRF) data. This method carries out by the following process; (1)The SEA parameters were calculated by test/analysis FRF data, (2)Estimated energy responses between subsystems were calculated by using the SEA parameters, (3)Predicted velocity responses were estimated in a subsystem, and (4)Predicted velocity converts to sound pressure. As a result, sound pressures could be predicted by this method with few errors.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

A rest room is required in comfortable living space. There's a tank less toilet going around because a space is excluded recently. But toilet jet that is specific for tank less toilet becomes a problem for the living environment noise. So this paper describes the improvement of sound quality of toilet jet. An acrylic board model is made for taking a picture of the flushing mechanism by a high-speed video camera. It is found that the jet noise generates many bubbles involved in water current, and in order to reduce noise, the form of a nozzle is changed. For the result is evaluated, the relationship between sound quality of toilet jet and human sensation is investigated by using sound metrics and vital data.

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：日経BP企画  

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Language：Japanese  

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：自動車技術会  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Vehicle component test of automobile is very important at early design stage to provide in-sight consideration of durability in terms of dynamic strain concentration. Based on the fact that the dynamics of component solely is different from those of system, a new strain sensitivity analysis is proposed to give proper mass addition applied to component, which provides same strain concentration as the system.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The structural modification prediction is very useful based on FRF. But in case of micro devices, the conventional exciter gives additional constraint and mass loading. First using MEMS like structure, the alternative displacement input can not predict properly is confirmed numerically and experimentally. Then a new micro exciter is so developed as to apply successfully to DVD pickup.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The dynamic behaviors at connecting part is very important for component synthesis of flexible structure like satellite. Two beam structure is used for accurate modeling at connecting part to approximate by translational and rotational springs. This method is applied to a satellite model and appropriate connecting part is predicted to shift the objective natural frequency.

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：Nikkan Kogyo Shimbun  

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Language：Japanese   Publisher：Society of Automotive Engineers of Japan  

CiNii Books

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Language：Japanese  

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Language：Japanese   Publisher：日本工業出版株式会社  

CiNii Books

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Language：Japanese   Publisher：ターボ機械協会  

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CiNii Books

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Language：Japanese  

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper describes how to effectively use a tester for magnetic disk head. Due to difficulty in measuring a lot of points at disk head, a method is developed to represent virtually the vibration at unmeasureable points. In order to provide consistent evaluation, a compensation method is proposed.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

An ultra precision machine, such as semiconductor stepper should prevent from nm order level of vibration, which is generated by acoustic excitation due to inside cavity resonance. Two methods are proposed, to add a mass at inner structure by extended sensitivity analysis or to place a cover plate to reduce the acoustic excitation. Experiment on simple structure verifies the proposed methods.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper describes a development of simulator for noise and vibration of vehicle installed equipment under actual running condition. A compensation coefficient is proposed to convert multi axes simulation signal to single axis and confirmed by using single axis exciter with sinusoidal single instead of different frequencies in three axes. Moreover a signal of actual running vehicle is validated by numerical and experimental model correctly.

CiNii Books

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper describes the technique for force identification and vibration reduction of body in hybrid car. Nowadays, the hybrid car that can realize improvement in fuel consumption and a clean exhaust gas attracts attention. The hybrid engine system has two forces, a gasoline engine and a motor, and therefore the direction of resultant force of hybrid system changes with the influences of a motor. This research identifies force of hybrid system, and suitable structural modification using beat sensitivity analysis function to reduce vibration.

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

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Language：Japanese   Publisher：日経ＢＰ社  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The realization of vibration realization response of machine used in different environment, for instance, in water is very difficult in terms of cost etc., therefore a new approach should be developed to excite the machine in air. First the conventional virtual input approach to a djust the input force is not appropriate and then the structural modification of mass addition in air is adopted to provide more accurate realization in water.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

A new dynamic displacement amplification mechanism is proposed to generate vertical axis motion by use of piezo actuator. The structure consists of cantilever part and vertical part which can compensate the radial motion causing less hole accuracy. Numerical analyses and experiments show satisfactory results.

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Language：Japanese   Publisher：日刊工業新聞社  

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This paper describes a prediction method to reduce impulsive noise of construction machinery under dumping operation. This method consists of three phases; first identification of noise sources using principal component analysis, second predicton of radiated noise using structual finite element method and acoustic boundary element method, finaly damping simultion to install in damping material for noise. This method is vertified by simple model experimentally.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper describes the technique of defining subsystem model in Experimental Statistical Energy Analysis (ESEA). SEA is applied to investigate the vibro-acoustic behavior of industrial structures like cars, trains, aircrafts and the others with high modal density and overlap in the middle and high frequency range. The structure is divided into subsystems complying with the SEA basic assumption: the structure must be divided in weakly coupled subsystems. In case of complex structure, many subsystems are defined and the large amount of measurement is required. This research proposes the effective method of subsystem modeling. The 1st report shows the simplifying technique in consideration of predicting accuracy and the dividing method based on measured internal loss factor of car body.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This study describes the design method to designate the stress at the specific part. The three processes to designate the stress at the specific part are proposed. First, using the cantilever beam with circular cross section, structural modification is done by using the explicit stress. Second, using the more complex model, structural modification is done by using the calculated stress by total FE model. Third, structural modification is done by using measured stress by experiment in conjunction with FE model of specific part.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper describes an identification method of rolling bearing defects in rotating machinery. At first problems of identification using only vibration response are discussed. This paper describes a new identification method identify force generated by bearing defect using vibration response and frequency response function. And then to identify location of defective bearing is also proposed. This provides a decision method of best measurement points. Finally reduction of measurement points using pseudo inverse matrix is achieved.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper describes the technique of defining subsystem model in Experimental Statistical Energy Analysis (ESEA). SEA is applied to investigate the vibro-acoustic behavior of industrial structures like cars, trains, aircrafts and the others with high modal density and overlap in the middle and high frequency range. The structure is divided into subsystems complying with the SEA basic assumption: the structure must be divided in weakly coupled subsystems. In case of complex structure, many subsystems are defined and the large amount of measurement is required. This research proposes the effective method of subsystem modeling. The 2nd report shows the defining subsystem network for good prediction at the target subsystem. This technique can be improved to predict the noise and vibration of car body.

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This study describes design method for nonlinear vibration reduction of Audio Visual Apparatus mounted on Automobile due to gap vibration, which causes reading error. First, the mechanism of gap vibration is analyzed by modal analysis. Second, which gap parts play important role is identified using real time animation. Finally based on sensitivity analysis with paying attention to gap vibration characteristics, the gap vibration can be reduced and the improvement of reading error is achieved.

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Language：English   Publisher：INDIAN ACADEMY SCIENCES  

In order to determine appropriate points where natural frequency or mode shape under consideration can be effectively modified by structural modification, the theoretical background of sensitivity analysis is described, followed by experimental verification with a simple structure. Then it can be extended to (1) operational deflection shape, where a problem arises at off-resonance frequency, (2) relative motion, (3) transmitted force through connecting points between components, (4) servo system, which consists of electrical elements with mechanical elements, and (5) acoustics generated by the vibration of the structure. To illusrate its effectiveness, many actual examples are given.

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

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Language：Japanese   Publisher：フジテクノシステム  

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Language：Japanese   Publisher：中央大学父母連絡会  

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Language：Japanese   Publisher：日本騒音制御学会  

DOI： 10.11372/souonseigyo1977.22.248

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Other Link： https://jlc.jst.go.jp/DN/JALC/00055860345?from=CiNii

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