| Presentation | 2020-01-22 [Poster Presentation] Comparison of propagation phenomenon of ultrasound and secondary wave using numerical analysis of nonlinear acoustics Motoharu Oyama, Kan Okubo, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Feasibility of acoustic sensing for occlusion areas combining super-directivity speaker and pulse compression technique has been investigated experimentally. However, the detailed mechanism of the propagation process has not been sufficiently discussed, and therefore numerical examination is important to clarify this issue. In this study, numerical simulation is performed using the governing equation of the sound field considering the nonlinearity; the propagation process of the secondary wave field generated from the parametric sound source is numerically examined. In this presentation, we compare the propagation process of the ultrasound and the secondary wave. It is shown that the secondary wave travels to occlusion areas by computing the diffraction process of each frequency component of sound. In addition, it is demonstrated numerically that the secondary wave is effective for the object detection in occlusion areas. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | nonlinear acoustics / parametric array / occlusion areas sensing / numerical analysis of sound wave propagation / FDTD method / diffraction |
| Paper # | US2019-85 |
| Date of Issue | 2020-01-15 (US) |
| Conference Information | |
| Committee | EA / US |
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| Conference Date | 2020/1/22(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Doshisha Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonics, and Related Topics |
| Chair | Kenichi Furuya(Oita Univ.) / Jun Kondo(Shizuoka Univ.) |
| Vice Chair | Suehiro Shimauchi(Kanazawa Inst. of Tech.) / Shigeto Takeoka(Shizuoka Inst. of Science and Tech.) / Shinichi Takeuchi(Toin Univ. of Yokohama) / Hikaru Miura(Nihon Univ.) |
| Secretary | Suehiro Shimauchi(NHK) / Shigeto Takeoka(Univ. of Tokyo) / Shinichi Takeuchi(Kanagawa Univ.) / Hikaru Miura(Doshisha Univ.) |
| Assistant | Keisuke Imoto(Ritsumeikan Univ.) / Daisuke Morikawa(Toyama Pref Univ.) / Mototaka Arakawa(Tohoku Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Engineering Acoustics / Technical Committee on Ultrasonics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | [Poster Presentation] Comparison of propagation phenomenon of ultrasound and secondary wave using numerical analysis of nonlinear acoustics |
| Sub Title (in English) | sound wave diffracting to occlusion area |
| Keyword(1) | nonlinear acoustics |
| Keyword(2) | parametric array |
| Keyword(3) | occlusion areas sensing |
| Keyword(4) | numerical analysis of sound wave propagation |
| Keyword(5) | FDTD method |
| Keyword(6) | diffraction |
| 1st Author's Name | Motoharu Oyama |
| 1st Author's Affiliation | Tokyo Metropolitan Univeersity(Tokyo Metropolitan Univ.) |
| 2nd Author's Name | Kan Okubo |
| 2nd Author's Affiliation | Tokyo Metropolitan Univeersity(Tokyo Metropolitan Univ.) |
| Date | 2020-01-22 |
| Paper # | US2019-85 |
| Volume (vol) | vol.119 |
| Number (no) | US-374 |
| Page | pp.pp.83-87(US), |
| #Pages | 5 |
| Date of Issue | 2020-01-15 (US) |