水下空气腔角反射器声散射特性  

Acoustic Scattering Characteristics of Underwater Air-filled Cavity Corner Reflector

作　　者：罗祎[1] 陈鑫 LUO Yi;CHEN Xin(College of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China)

机构地区：[1]海军工程大学兵器工程学院

出　　处：《兵工学报》2019年第10期2129-2135,共7页Acta Armamentarii

摘　　要：针对水下金属板角反射器目标强度低、具有明显的频率特性等不足,设计了一种新的弹性空气腔角反射器。采用结构有限元耦合流体边界元法,对水下空气腔角反射器和单层金属薄板角反射器的声散射特性进行仿真计算和对比,分析了入射波频率为5~15kHz范围内,平板厚度、入射角度等因素对不同类型角反射器目标强度的影响及其散射机理并进行了实验验证。研究结果表明:空气腔角反射器散射强度大,无明显的频率特性,去耦作用明显;空气腔角反射器声散射仿真结果和消声水池实测数据进行对比,二者基本一致;相比笨重且回波强度较弱的单层金属板角反射器,空气腔角反射器具有更优的反声性能和更轻的质量,是理想的水下声反射装置。In accordance with the weakness of low target strength and obvious frequency characteristics of underwater elastic metal plate corner reflectors,a new air-filled cavity elastic corner reflector is designed.The scattering acoustic fields of underwater air-filled cavity corner reflector and single layer metal sheet corner reflector are simulated and compared by using the structural finite element coupled fluid boundary element method( IBEM). The influences of thickness and incident angle on the target strengths and scattering mechanisms of different corner reflectors within 5-15 kHz frequency of incident wave are analyzed and verified through experiment. The research results show that the air-filled cavity corner reflector has great scattering intensity and no obvious frequency characteristics,and the decoupling effect is obvious.The simulated results are in basic agreement with the experimental results. Compared with the cumbersome single layer metal corner reflector with weak reflection intensity,the air-filled cavity corner reflector has better acoustic reflection performance and lighter weight,and is an ideal underwater acoustic reflection device.

关 键 词：角反射器 金属板 水下空气腔 声散射特性 目标强度 有限元 

分 类 号：TB566[交通运输工程—水声工程]