水下弹性圆柱体和球体双基地散射的光谱分析。

Spectral analysis of bistatic scattering from underwater elastic cylinders and spheres.

作者信息

Gunderson Aaron M, España Aubrey L, Marston Philip L

机构信息

Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA.

Applied Physics Laboratory, Acoustics Department, University of Washington, Seattle, Washington 98105, USA.

出版信息

J Acoust Soc Am. 2017 Jul;142(1):110. doi: 10.1121/1.4990690.

DOI:10.1121/1.4990690

PMID:28764467

Abstract

Far field sound scattering from underwater elastic spheres and finite cylinders is considered over the full range of scattering angles. Three models for the frequency response of the scattered field are evaluated: a hybrid finite element/propagation simulation for a finite cylinder with broadside illumination, an approximate solution for the finite cylinder, and the exact solution for a sphere. The cylinder models are shown to give comparable results, attesting to the strength of the finite cylinder approximate solution. Interference and resonance structure present in the frequency response of the targets is identified and discussed, and the bistatic spectra for a variety of elastic sphere materials are presented. A thorough understanding of the complicated angle and frequency dependence of the scattering from simple elastic targets is helpful for interpretation of backscattering data from targets at or near an interface, or for scattering data taken by moving automated underwater vehicles, acoustic arrays, or other forms of data collection involving bistatic scattering.

摘要

研究了水下弹性球体和有限长圆柱体在全散射角范围内的远场声散射。评估了散射场频率响应的三种模型：一种针对宽边照射的有限长圆柱体的混合有限元/传播模拟、有限长圆柱体的近似解以及球体的精确解。结果表明，圆柱体模型给出了可比的结果，证明了有限长圆柱体近似解的优势。识别并讨论了目标频率响应中存在的干涉和共振结构，并给出了多种弹性球体材料的双基地频谱。深入理解简单弹性目标散射的复杂角度和频率依赖性，有助于解释来自界面处或附近目标的后向散射数据，或由移动的自动水下航行器、声学阵列或其他涉及双基地散射的数据收集形式获取的散射数据。