豊橋技術科学大学

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Yoshinaga, Tsukasa

Affiliation Department of Mechanical Engineering
Title Assistant Professor
Fields of Research Fluid Dynamics, Biomechanics, Aeroacoustics
Degree Ph.D.
Academic Societies Japan Society of Mechanical Engineering, Acoustical Society of America, Acoustical Society of Japan
E-mail yoshinaga@me
Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL http://aero.me.tut.ac.jp/
Researcher information URL(researchmap) Researcher information

Research

発音や楽器の空力音に関する研究
Study on speech production and musical instruments

口腔内の気流から出る音や,楽器から出る空力音に関して,流体力学や音響学をベースに調べています.
In our group, we investigate the mechanisms of aeroacoustic sounds generated by vocal folds, vocal tracts, and musical instruments based on fluid dynamics and acoustics.

関連動画:
https://www.youtube.com/watch?v=qOaH9ssZCcc

https://www.youtube.com/watch?v=Dw5FyFoqLyY

Theme1:Study on production mechanisms of fricative consonants

Overview

Fricative consonants, one of the speech sounds, are known to be generated by a jet flow formed at a particular part of the vocal tract. The sound is generated as an aeroacoustic sound when the turbulent jet flow impinges on the vocal tract. By studying the generation mechanisms from the point of view of fluid dynamics, we are trying to improve the assessment and treatment for speech disorders.

Selected publications and works

1. Nozaki, K., Yoshinaga, T. and Wada, S. “Sibilant /s/ simulator based on computed tomography images and dental casts,” Journal of Dental Research, 93(2), pp. 207-211, 2014.
https://doi.org/10.1177/0022034513514586
2. Yoshinaga, T., Nozaki, K., and Wada, S. “Effect of tongue position in the simplified vocal tract model of sibilant fricatives /s/ and /ʃ/,” Journal of the Acoustical Society of America, 141(3), pp. EL314-EL318, 2017.
https://doi.org/10.1121/1.4978754
3. Yoshinaga, T., Van Hirtum, A., and Wada, S. “Multimodal modeling and validation of simplified vocal tract acoustics for sibilant /s/,” Journal of Sound and Vibration, 411, pp.247-259, 2017.
https://doi.org/10.1016/j.jsv.2017.09.004
4. Yoshinaga, T., Nozaki, K., and Wada, S. “Experimental and numerical investigation of the sound generation mechanisms of sibilant fricatives using a simplified vocal tract model,” Physics of Fluids, 30, 035104, 2018.
https://doi.org/10.1063/1.5013632
5. Yoshinaga, T., Nozaki, K., and Wada, S. “Aeroacoustic analysis on individual characteristics in sibilant fricative production,” Journal of the Acoustical Society of America, 146(2), pp. 1239–1251, 2019.
https://doi.org/10.1121/1.5122793

Keywords

Speech production, Aeroacoustics, Fricatives

Theme2:Study on vocal folds

Overview

The sound of vocal folds is known to be generated by the self-sustained oscillations induced by the airflow from lungs, and it has been studied from many aspects of researches. The sound generation mechanisms of the vocal folds and vocal tracts have been also investigated by using simplified vocal fold models. In this study, properties of the sound generation in the artificial vocal fold developed by Prof. Arai of Sophia University and other vocal fold models are examined by the fluid-structure-acoustic interaction simulation techniques.

Selected publications and works

1. Yoshinaga, T., Arai, T., Inaam R., Yokoyama, H. and Iida, A. “A fully coupled fluid–structure–acoustic interaction simulation on reed-type artificial vocal fold,” Applied Acoustics, 184, 108339, 2021.
https://doi.org/10.1016/j.apacoust.2021.108339
2. 吉永司,荒井隆行,Inaam R., 横山博史,飯田明由.”円筒型声道を付したリード式人工声帯の流体-構造-音響連成シミュレーション” ながれ 40, 226-233, 2021.

Keywords

Vocal folds, Self-sustained oscillation, Artificial larynx

Theme3:Numerical simulation of a single-reed instrument

Overview

The numerical simulation of a single-reed instrument, one of the woodwind instruments like clarinet and saxophone, is conducted to examine the interaction among the flow, reed oscillation, and acoustic propagation in the instrument. Our goal is to develop a better instrument for players through this numerical simulation.

Selected publications and works

1. Yoshinaga, T., Yokoyama, H., Shoji, T., Miki, A., and Iida, A. “Global numerical simulation of fluid-structure-acoustic interaction in a single-reed instrument,” Journal of the Acoustical Society of America 32, 1623-1632, 2021.
https://doi.org/10.1121/10.0003757
2. Yoshinaga, T., Yokoyama, H., Shoji, T., Miki, A., and Iida, A. (2021). Numerical investigation of effects of lip stiffness on reed oscillation in a single-reed instrument. Proceedings of 180th meeting of Acoustical Society of America, A68, 2021.

Keywords

Single-reed instrument, Fluid-structure-acoustic interaction

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