利用声辐射模态重构任意目标的散射声场

发布时间：2018-03-05 14:43

本文选题：声辐射模态　切入点：声散射　出处：《应用声学》2017年03期 　论文类型：期刊论文

【摘要】：水下目标散射声场的重构可以作为水下目标散射特性的研究基础。本文主要利用声辐射模态对水下目标进行散射声场重构研究。首先,在借助声传递矩阵给出的任意结构声辐射模态的流体域求解方法基础上,通过理论证明了目标的散射声压与声辐射模态具有函数关系。其次,借助声场分布模态的概念,同时考虑到声场分布模态病态及声压测量易受噪声污染,提出基于声辐射模态的正则化散射声场重构算法。仿真结果表明,波数越低,重构所需声辐射模态阶数越少,在较高波数时仅需总模态数的大约20%即可对声场进行重构。与基于边界元的声场重构算法相比,计算量减小了至少80%,且克服了赫姆霍兹积分方程最小二乘法仅对球壳结构的重构效果较好而不适用于长条形结构重构的缺陷。
[Abstract]:The reconstruction of underwater target scattering sound field can be used as the research basis of underwater target scattering characteristics. In this paper, acoustic radiation mode is mainly used to study underwater target scattering sound field reconstruction. On the basis of the fluid domain solution method of acoustic radiation modes of arbitrary structures given by acoustic transfer matrix, the functional relationship between the scattering sound pressure of the target and the acoustic radiation modes is proved by theory. Secondly, with the help of the concept of the acoustic field distribution mode, Considering that the sound field distribution mode is sick and the sound pressure measurement is liable to be polluted by noise, a regularized scattering sound field reconstruction algorithm based on acoustic radiation mode is proposed. The simulation results show that the lower the wave number, the less the sound radiation mode order is required for the reconstruction. When the wave number is higher, only about 20% of the total modal number is needed to reconstruct the sound field. The calculation cost is reduced by at least 80%, and the defect that the least square method of Hem's integral equation is only good for the reconstruction of spherical shell structure and is not suitable for the reconstruction of long strip structure is overcome.
【作者单位】：西安科技大学理学院;西北工业大学航海学院;
【基金】：西安科技大学博士启动金项目(2016QDJ043)
【分类号】：TB56

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