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Katsuya Yamauchi Last modified date:2018.01.16

Associate Professor / Science of Sound Design
Department of Communication Design Science
Faculty of Design

Undergraduate School

Academic Degree
Field of Specialization
Psychoacoustics, Noise Control Engineering
Outline Activities
His research interest includes environmental acoustics, noise control engineering and sound design, which are investigated through psycho-acoustical evaluation. Recently, he has been focused on the issues concerning the sound of next generation vehicles (such as electric or hybrid electric vehicles, EV/HEV) to discuss future road traffic noise and urban sound environment.
Research Interests
  • Study on sound design for quiet vehicles (EV/HEV)
    keyword : Sound Design, Subjective Evaluation, Electric Vehicles/ Hybrid Electric Vehicles (EV/HEV), Traffic Noise
  • Study on Acoustic Vehicle Alerting Sound for quiet vehicles (EV/HEV)
    keyword : Subjective Evaluation, Electric Vehicles/ Hybrid Electric Vehicles (EV/HEV), Traffic Noise
  • Prediction of the effect of next generation vehicle on urban road traffic noise
    keyword : Road Traffic Noise, Prediction, Next Generation Vehicles (EV/HEV), Acoustic Power Level
  • Subjective evaluation on aerodynamic noise of vehicle door mirror
    keyword : Aerodynamic noise, vehicle NVH, subjective evaluation, vehicle door mirror
Academic Activities
1. Katsuya Yamauchi, Relationship between Acceleration Impression and Frequency Shifting of Vehicle Sound, UN/ECE/WP29/GRB/QRTV, Informal Document GTRQRTV-05-03e, 2013.12.
1. Katsuya Yamauchi, Daniel Menzel, Masayuki Takada, Koji Nagahata, Shin-ichiro Iwamiya, Hugo Fastl, Psychoacoustic Examination of Feasible Level of Additional Warning Sound for Quiet Vehicles, Acoustical Science and Technology, 36, 2, pp.135-137, 2015.03, 低騒音車(Quiet vehicles)の接近を知らせるために,接近報知音を装備することが検討されている。そのデザインのための基礎的知見を提供するため,接近報知音を利用するとした際にそれらに求められる音量を,ドイツ在住者を対象にした音響心理実験により検討した。日本とドイツの被験者を対象としたCross-culturalな比較を行い,その評価が文化的な背景に影響されることは少ないことを示した。.
1. Katsuya Yamauchi, Questionnaire Survey on the Encounter Experience with Quiet Vehicles, Inter-noise 2017, 2017.08, Relative quietness of electric or hybrid electric vehicles is one of the most important topics in environmental acoustics. Although reduced vehicle noise is eligible for urban sound environment, it is also a matter of pedestrians’ safety concern. Hence, regulations regarding additional warning sounds for the quiet vehicles have been developing in Japan as well as in global. Recently the UN-regulation regarding the warning system to compensate their quietness by additional warning device, Acoustic Vehicle Alerting System (AVAS) according to the regulation, has been approved. Those kinds of measures should be carefully discussed. Several studies have been conducted in different institutions to examine the feasible sound design for the warning to be detected in urban noise environment. This paper introduces the result of a questionnaire survey on the risks and encountering experiences with quiet vehicles on streets, and also on the knowledge and opinion to the additional warning sounds. The survey was conducted via internet form, and collected answers from Japanese younger generation. The result was compared with the similar survey previously conducted by the author..
2. Katsuya Yamauchi, Saki Liu, Keita Suzuki, Takuya Nomura, Developing Method Describing Impression of Unknown Sounds through Non-Acoustic Event —for a Sound Design of Electric Vehicle—, Inter-noise 2016, 2016.08, It is important, however, to know the factors that make sounds to recall EVs particularly to design the warning sounds for EVs to ensure awareness of them. However, most of people have not had experience to see, listen to, or drive electric vehicles (EVs), then the sound of EVs are unknown for most of people. To understand these factors, we developed a method to know an impression of unknown sounds through non-acoustic events related to the impression of running EVs, in this study those were the impression of road environments or the driving impression. We assumed that if the impression of the non-acoustic events were highly related to running EVs, the sounds that had similar impression could be evaluated to harmonize with EVs. At the first stage of the presenting method, we conducted a large scale social survey to collect enough number of words that correspond with the non-acoustic events. The collected answers were divided some clusters which represent the non-acoustic events by by hierarchical cluster analysis using the mutual occurrence frequency between two words. Then the impression of the landscapes that were evoked by each word cluster was examined through the SD-method subjective evaluation experiment. As the result, we described the impression of the sounds that would potentially harmonize with driving EVs..
3. Katsuya Yamauchi, Soichi Sasaki, Shinya Yamashita, Masaru Takeshita, SUBJECTIVE EVALUATION OF VEHICLE DOOR MIRROR NOISES WITH DIFFERING CLEARANCES BETWEEN PARTS, The 22nd International Congress on Sound and Vibration (ICSV), 2015.07, As a part of a study on the effects of mounting conditions of vehicle door mirror on aerody- namic noise, hearing impression of the noises were examined by a series of subjective evalu- ations. We focused on the difference of aerodynamic noise caused by the differing clearance between the mounting base and door panel, and that between the base and mirror visor. To examine the effects of these clearances on hearing impression, a series of subjective evalua- tion experiments were conducted. The aerodynamic noises were recorded in a wind tunnel using several mirror models that had different clearances. The acoustic transfer function be- tween door mirror and ear position of a driver, which was previously measured, was convo- luted to the recorded noises. To evaluate the relative difference on hearing impression, we conducted a similarity evaluation using paired-comparison method (Experiment 1). As the result of the first experiment, we obtained two-dimensional hearing impression space, then we confirmed the significant difference between the mounting clearances. The relative posi- tions of stimuli on the impression space indicated that the impression was affected not only by A-weighted sound pressure level but also the other aspects. To confirm the qualitative meaning of the relative difference, the other experiment using semantic differential (SD) method was conducted (Experiment 2). The relationship between the hearing impression space and the rating values of SD-scales was discussed by the multi-regression analysis. The results suggested that a larger clearance between the mounting base and mirror visor resulted a noisy and bright impression..
Membership in Academic Society
  • The Acoustical Society of Japan
  • Institute of Noise Control Engineering of Japan
  • Society of Automotive Engineers of Japan
Professional and Outreach Activities
National committee member for ISO/TC43
Member of Informal Group for Quiet Road Transport Vehicles (UNECE/WP29/GRB).