Kirchhoff Approximations for the Forward-Scattering Target Strength of Underwater Objects

IF 1.3 3区物理与天体物理 Q3 ACOUSTICS Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI:10.1142/s2591728519500087

Chuanlin He, Yi Zheng, Xu Xiang, Yuanliang Ma

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引用次数: 3

Abstract

Kirchhoff approximations for the forward-scattering target strength of underwater objects are developed by combining Babinet’s principle and the Kirchhoff integral, where theoretical formulations and a numerical implementation are given in detail. The Kirchhoff approximation is found to be a high-frequency physical acoustic approximation. The forward-scattering target strength versus frequency and the spatial angles for spherical objects, prolate spheroids and the Benchmark Target Strength Simulation Submarine (BeTSSi-Sub) model are obtained by the Kirchhoff approximation and compared with results from theory, the deformed cylinder method (DCM) and the boundary element method (BEM). The Kirchhoff approximation shows considerable agreement with the theoretical and numerical approaches in a region of [Formula: see text] from the rigorous forward-scattering direction. The forward-scattered field contour and the corresponding directivity for the BeTSSi-Sub model are also calculated as a demonstration. Mode coupling caused by the simulated target is clearly revealed. The results indicate that the Kirchhoff approximation can predict the forward-scattering target strength of complex underwater objects.

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水下目标前向散射强度的Kirchhoff近似

结合Babinet原理和Kirchhoff积分，提出了水下目标前向散射强度的Kirchhoff近似，给出了理论表达式和数值实现。发现基尔霍夫近似是一个高频物理声学近似。采用Kirchhoff近似得到了球形物体、长形球体和基准目标强度模拟潜艇(BeTSSi-Sub)模型的前向散射目标强度随频率的变化和空间角度，并与理论、变形圆柱法(DCM)和边界元法(BEM)的结果进行了比较。从严格的前向散射方向来看，Kirchhoff近似与理论和数值方法在[公式:见文本]区域内显示出相当大的一致性。计算了betsi - sub模型的前向散射场等值线及其指向性。模拟目标引起的模式耦合得到了清晰的揭示。结果表明，Kirchhoff近似可以预测复杂水下目标的前向散射强度。

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来源期刊

Journal of Theoretical and Computational Acoustics Computer Science-Computer Science Applications

CiteScore

2.90

自引率

42.10%

发文量

期刊介绍： The aim of this journal is to provide an international forum for the dissemination of the state-of-the-art information in the field of Computational Acoustics. Topics covered by this journal include research and tutorial contributions in OCEAN ACOUSTICS (a subject of active research in relation with sonar detection and the design of noiseless ships), SEISMO-ACOUSTICS (of concern to earthquake science and engineering, and also to those doing underground prospection like searching for petroleum), AEROACOUSTICS (which includes the analysis of noise created by aircraft), COMPUTATIONAL METHODS, and SUPERCOMPUTING. In addition to the traditional issues and problems in computational methods, the journal also considers theoretical research acoustics papers which lead to large-scale scientific computations.