| 张毅,安俊英,成刚,徐芳.薄壳目标的多基地声散射特性研究[J].声学技术,2022,41(3):452~459 |
| 薄壳目标的多基地声散射特性研究 |
| Study on multi-base acoustic scattering characteristics of thin shell targets |
| 投稿时间：2022-01-04 修订日期：2022-02-12 |
| DOI：10.16300/j.cnki.1000-3630.2022.03.021 |
| 中文关键词: 多基地 声散射特性 有限元耦合边界元 基尔霍夫(Kirchhoff)近似积分 |
| 英文关键词: multi-base sound scattering characteristics finite element coupled boundary element Kirchhoff approximate integration |
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| 中文摘要: |
| 文章对水中薄壳目标的多基地声散射特性进行了理论仿真与试验测量研究。首先采用有限元耦合边界元和基尔霍夫(Kirchhoff)近似积分两种不同的数值计算方法对内部充气球冠圆柱壳的多基地声散射特性进行建模仿真，然后通过目标在消声水池的散射声场试验测量验证仿真结果的有效性。采用相同的数值计算方法对Benchmark模型的多基地散射声场进行仿真计算，分析多基地(全向)声散射特性及散射机理。结果表明，水中目标多基地散射的回波强度与回波结构与多基地分置角相关，且回波亮点的主瓣宽度也随多基地分置角变化而变化；Benchmark模型的艇体和指挥舱之间存在强烈的干涉作用，使多基地(全向)散射声场的竖状条纹发生倾斜。研究为水下目标的多基地探测提供理论支持。 |
| 英文摘要: |
| In this paper, simulations and experiments of the multi-base acoustic scattering characteristics of thin-shell targets in water are carried out. Firstly, two different numerical calculation methods, finite element coupled with boundary element method and Kirchhoff approximate integration method, are used to simulate the multi-base acoustic scattering characteristics of the cylindrical shell with an internally inflated spherical crown, and the validity of the simulation results is verified by experimental measurements in an anechoic pool. The same numerical calculation method is used to simulate the multi-base scattered sound field of Benchmark model and analyze the corresponding omnidirectional sound scattering characteristics and scattering mechanism. The results show that the echo intensity and the echo structure of multi-base scattering from underwater targets are related to the multi-base split angle, and the width of the main flap of the echo bright spot also varies with the multi-base split angle; there is a strong interference effect between the hull and the command module of the Benchmark model, which tilts the vertical stripes of the multi-base scattered sound field in all directions. The study provides theoretical support for the multi-base detection of underwater targets. |
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