碩士 / 國立臺灣海洋大學 / 系統工程暨造船學系 / 106 / This thesis investigates the scattering effect from the surface of underwater vehicle in frequency domain. Firstly, we compare the scattered effect with a literature which studies the effect using time domain iteration method with a simple geometry. Using the acoustics analysis software by finite element method, we can predict sound and noise performance. AML (Automatically Matched Layer), a latest technique, is used to approach to account for the radiation condition. Two different parts of simulation is being done in this thesis. A plane wave is given at four field points separately to calculate the pressure scattered on the submarine hull. Another comparison between scattering effect on rigid and elasticity body in acoustic-structure coupling is resulted in this thesis. Target strength is calculated to evaluate the scattering effect. The target strength of elasticity body is bigger than the rigid body from 1000Hz to 2000Hz, the value of target strength at 2000Hz is the largest. By knowing the target strength, we can identified the location of the underwater vehicle thereby the safety factor can be improved.
Keywords: Scattering; AML; acoustic-structure coupling; target strength
| Identifer | oai:union.ndltd.org:TW/106NTOU5345016 |
| Date | January 2018 |
| Creators | Huong Mee Yii, 方美瑜 |
| Contributors | Shyu, Rong-Juin, Chiu, Jinn-Tong, 許榮均, 邱進東 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 47 |
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