| Presentation | 2018-08-30 Quantitative analysis of acoustic reflection characteristics on sea surface using FDTD simulation Tomoya Tsukui, Shinichi Sawada, Shinnosuke Hirata, Hiroyuki Hachiya, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Many kinds of hydro acoustic devices are used in the field of ocean development of resources and observations with AUV and ASV. For example, underwater acoustic communication, these devices transmit and receive sound under the sea, so it is important to evaluate characteristics of sound reflection on sea surface. A completely reflection model on sea surface without waves is often used, but amplitude and phase of reflected sound wave fluctuates because of the changing sea surface with waves. In this study, using acoustic simulation with the FDTD method, we evaluated variability characteristics of reflected sound waves on sea surface generated by Bretshneider-Mitsuyasu spectra observed in deep offshore coast of Japan. With increasing frequency, wave height, and shortening of wavelength of the sea surface wave, we confirmed that a probability density function (PDF) of reflected sound amplitude can be expressed by Rice distribution which changes from a Gaussian distribution to a Rayleigh distribution. In addition, a PDF of reflected sound phase changes from a Gaussian distribution to a uniform distribution as the Rayleigh parameter 2k$sigma$_z increases. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Sea surface / Sound reflection / FDTD method / Variability characteristics of amplitude and phase |
| Paper # | US2018-41 |
| Date of Issue | 2018-08-23 (US) |
| Conference Information | |
| Committee | US |
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| Conference Date | 2018/8/30(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Institute of Technology |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Shinichi Takeuchi(Toin Univ. of Yokohama) |
| Vice Chair | Minoru Kurosawa(Tokyo Inst. of Tech.) / Jun Kondo(Shizuoka Univ.) |
| Secretary | Minoru Kurosawa(Univ. of Tokyo) / Jun Kondo(Kanagawa Univ.) |
| Assistant | Daisuke Koyama(Doshisha Univ.) |
| Paper Information | |
| Registration To | 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) | Quantitative analysis of acoustic reflection characteristics on sea surface using FDTD simulation |
| Sub Title (in English) | |
| Keyword(1) | Sea surface |
| Keyword(2) | Sound reflection |
| Keyword(3) | FDTD method |
| Keyword(4) | Variability characteristics of amplitude and phase |
| Keyword(5) | |
| 1st Author's Name | Tomoya Tsukui |
| 1st Author's Affiliation | IHI Corporation(IHI) |
| 2nd Author's Name | Shinichi Sawada |
| 2nd Author's Affiliation | IHI Corporation(IHI) |
| 3rd Author's Name | Shinnosuke Hirata |
| 3rd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 4th Author's Name | Hiroyuki Hachiya |
| 4th Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| Date | 2018-08-30 |
| Paper # | US2018-41 |
| Volume (vol) | vol.118 |
| Number (no) | US-199 |
| Page | pp.pp.1-6(US), |
| #Pages | 6 |
| Date of Issue | 2018-08-23 (US) |