水下弹性角反射器声散射特性  

Acoustic Scattering Characteristics of Underwater Elastic Corner Reflectors

作　　者：陈鑫 罗祎[1] 李爱华 CHEN Xin;LUO Yi;LI Ai-hua(College of Weaponpy Engineering,Naval University of Engineering,Wuhan 430033,Hubei,China;Navy Unit 92771 of PLA,Qingdao 266405,Shandong,China)

机构地区：[1]海军工程大学兵器工程学院 [2]海军92771部队

出　　处：《兵工学报》2018年第11期2236-2242,共7页Acta Armamentarii

摘　　要：计算水下弹性角反射器声散射问题,需要考虑声波多次散射以及结构和水的流固耦合作用。针对现有水下弹性角反射器声散射特性分析方法的不足,利用结构有限元耦合流体间接边界元法对水下弹性角反射器的远场散射声场进行仿真计算。分析了入射波频率为5. 0~20. 0 kHz范围内,平板材料、厚度、入射角度及角反射器类型等因素对目标强度的影响及其散射机理。结果表明:水下弹性角反射器的散射声场具有很强的频率特性,且随材料、平板厚度和入射波频率的变化而改变;多次散射波对角反射器的反向散射声场具有重要贡献,仿真数据和实测数据基本一致。进一步提出了角反射器结构设计和优化方法,为水下无源声反射器的论证与设计提供了理论参考依据。The muhiple scattering of sound waves and the fluid-structure interaction should be taken into account to calculate the acoustic scattering of underwater elastic comer reflectors. The scattering acoustic field of underwater elastic comer reflectors in far field is simulated by using structure finite element method （FEM）/fluid indirect coupled boundaU element method （IBEM）. The influences of plate material and thickness, incident angle and the type of comer reflector on target strength and the scattering mechanism are analyzed when the incident wave frequency varies fl＇om 5.0 kHz to 20.0 kHz. The resuhs show that the scattering acoustic field of underwater elastic comer reflectors has a strong frequency characteristic. It varies with plate material and thickness, and incident wave frequency. The muhiple scattering of sound waves has important contributions to the backscattering acoustic field of comer reflectors. The simulated resuhs are in good agreement with the experimental results. The structure design and optimization method of comer reflectors are presented.

关 键 词：水下弹性角反射器 间接边界元 散射声场 流体与固体耦合 

分 类 号：TB566[交通运输工程—水声工程]