水下圆柱壳自由场声辐射特性的获取  

The acquisition of acoustic radiation characteristics of underwater cylindrical free-field

作　　者：林伟 夏茂龙[1] 孟春霞 黎胜[1] Lin Wei;Xia Maolong;Meng Chunxia;Li Sheng*(State Key Laboratory of Structural Analysis for Industrial Equipment,School of Naval Architecture Engineering,Dalian University of Technology,Dalian 116024,China;Key Laboratory for Underwater Measurement and Control Technology,Dalian 116013,China)

机构地区：[1]大连理工大学船舶工程学院工业装备结构分析国家重点实验室,辽宁大连116024 [2]水下测控技术重点实验室,辽宁大连116013

出　　处：《中国舰船研究》2019年第2期83-90,共8页Chinese Journal of Ship Research

基　　金：水下测控技术重点实验室延伸性发展基金资助项目(YS0C261506)

摘　　要：[目的]水下目标的声辐射特性测量通常因受到海面、海底和外部噪声源的干扰而难以获取。为了解决在以海面或海底为界且有噪声源干扰下的半空间内水下目标自由场声辐射特性的获取问题,[方法]利用基于边界元法的声场还原技术,以典型的水下圆柱壳模型为例,分别还原圆柱壳只在海面/海底影响下或同时受海面/海底以及外部噪声源影响下的自由场声辐射特性。[结果]数值结果表明:海面、海底和外部噪声源会极大地影响水下目标辐射声场的测量结果,但利用基于边界元的声场还原方法分离得到的还原声场的辐射声功率与自由声场的结果吻合较好,同时场点声压、指向性等特性也基本一致。[结论]因此可以利用基于边界元的声场还原方法有效获取水下目标的自由场声辐射特性。[Objectives]Measurement of acoustic characteristics of underwater targets is usually affected by the sea surface,seabed and external noise sources.It is difficult to obtain the free-field acoustic radiation characteristics of the targets.In order to solve the problem in acquiring the free-field acoustic radiation characteristics of the underwater targets in a half space whose boundary is the sea surface or the seabed where there is noise source,[Methods]the sound field recovery method based on the boundary element method is utilized,taking the typical underwater cylindrical shell as example,the free-field acoustic radiation characteristics of the cylindrical shell affected by the sea-surface/seabed or affected by both the sea-surface/seabed and external noise sources are separately recovered.[Results]The numerical simulation result shows that sea surface/seabed and external noise sources could greatly affect the measurement of the radiation sound field of an underwater target.But the sound power of recovery sound field separated by sound field recovery method based on the boundary element method is consistent with the sound power of free field.At the same time,the sound pressure,the directivity and other characteristics of field point are basically the same.[Conclusions]Therefore,the free-field acoustic radiation characteristics of the underwater targets could be effectively obtained by sound field recovery method based on boundary element method.

关 键 词：海面 海底 圆柱壳 边界元法 声场还原 

分 类 号：U661.44[交通运输工程—船舶及航道工程]