| 修正一阶Born近似改进水中弱散射目标的散射声场预报 |
| |
| 引用本文： | 张培珍, 王朔中, 王润田, 陈云飞, 王露贤. 修正一阶Born近似改进水中弱散射目标的散射声场预报[J]. 声学学报, 2014, 39(3): 331-338. DOI: 10.15949/j.cnki.0371-0025.2014.03.003 |
| |
| 作者姓名： | 张培珍 王朔中 王润田 陈云飞 王露贤 |
| |
| 作者单位： | 1. 上海大学通信与信息工程学院 上海 200072; |
| |
| 基金项目： | 国家自然科学基金(61071187);水下测控技术重点实验室基金(9140c260201110c26)资助 |
| |
| 摘 要： | 在推导Fourier衍射定理中运用一阶Born近似时忽略了弱散射体内外的波数差异,使散射声场方向特性的预报产生较大误差,针对这一问题,对一阶Born近似进行修正。考虑散射体内外波数差异引起的幅度和相位误差,通过调整频域采样圆弧半径并移动圆心位置得到了修正的一阶Born近似解。由于更准确地反映了目标与周围水介质的声学性质,有效提高了散射声场的预报精度。根据修正的Born近似计算了弱散射条件下无限长圆柱目标的散射远场指向性,结果与严格解相吻合,对其它形状截面的柱状目标也得到了合理的计算结果。
|
| 关 键 词： | Born 圆弧半径 圆心位置 声学性质 预报精度 散射体 近似解 相位误差 散射波 畸变波 |
| 收稿时间： | 2012-09-19 |
| 修稿时间： | 2013-09-27 |
Modification to first-order Born approximation for improved prediction of scattered sound from weakly scattering objects |
| |
| ZHANG Peizhen, WANG Shuozhong, WANG Runtian, CHEN Yunfei, WANG Luxian. Modification to first-order Born approximation for improved prediction of scattered sound from weakly scattering objects[J]. ACTA ACUSTICA, 2014, 39(3): 331-338. DOI: 10.15949/j.cnki.0371-0025.2014.03.003 |
| |
| Authors: | ZHANG Peizhen WANG Shuozhong WANG Runtian CHEN Yunfei WANG Luxian |
| |
| Affiliation: | 1. School of Communication and Information Engineering, Shanghai University Shanghai 200072;2. School of Information, Guangdong Ocean University Zhanjiang 524088;3. Shanghai Acoustics Laboratory, Chinese Academy of Sciences Shanghai 200032;4. Key Laboratory for Underwater Test and Control Technology Dalian 116013 |
| |
| Abstract: | When deriving the Fourier diffraction theorem based on the first-order Born approximation, the difference between wave number of the scattering object and that of the surrounding medium is ignored, causing substantial errors in sound scattering prediction. This paper modifies the Born approximation by taking into account the amplitude and phase changes at the interface between the scattering object and the water due to the wave number difference. By changing the radius and center position of the sampling circle in the Fourier domain, accuracy of the predicted sound scattering is improved. With the modified Born approximation, the computed far-field directional pattern of the scattered sound from a circular cylinder is in good agreement with the rigorous solution. Numerical calculations for several objects with different shapes are used to show applicability and effectiveness of the proposed method. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《声学学报》浏览原始摘要信息 |
|
点击此处可从《声学学报》下载全文 |
