水下非正交声学角反射器声散射特性研究  

Analysis of Acoustic Scattering Characteristics of Underwater Non Orthogonal Acoustic Corner Reflectors

作　　者：谢涛涛 罗祎[1] 肖大为[1] XIE Tao-tao;LUO Yi;XIAO Da-wei(College of Weaponry Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学兵器工程学院,湖北武汉430033

出　　处：《水下无人系统学报》2022年第1期94-101,共8页Journal of Unmanned Undersea Systems

摘　　要：水下角反射器具有较强的远场声散射特性,由于存在生产装配误差,标准正交金属角反射器无法满足各板面绝对垂直,因此生产误差是对角反射器声散射特性产生影响的重要因素。文中研究非正交角反射器的声散射特性,利用夹逼定理思想改变标准角反射器平板之间的夹角为90°、85°和80°,并进行定性分析;采用结构建模软件ANSYS依次对非正交二面角、三面角反射器进行模型构建及网格划分;再利用声学仿真软件SYSNOISE根据结构有限元+流体边界元的方法对其远场声散射特性进行仿真,并与标准正交角反射器在相同的载荷条件与声场条件下的声散射特性进行对比,得到声波不同入射角度下的目标声散射强度以及目标强度随入射声波频率的变化规律。仿真结果表明,正交角反射器声散射特性优于非正交角反射器,正交二面角反射器优于三面角反射器,二面角反射器生产误差在2°以内不会对声散射特性造成实质性影响。Underwater corner reflectors possess strong far-field acoustic scattering characteristics,and because of the assembly error,the standard orthogonal metal corner reflector cannot meet the absolute vertical of each plate.The production error is an important factor that affects the sound scattering characteristics of corner reflectors.The acoustic scattering characteristics of non-orthogonal corner reflectors were studied.The pinch theorem idea was used to change the angle between standard corner reflectors(90°,85°,and 80°),and a qualitative analysis was performed.The structural modeling software ANSYS was used to model and mesh the non-orthogonal dihedral and trihedral corner reflectors.The acoustic simulation software SYSNOISE was used to analyze the acoustic scattering characteristics of non-orthogonal dihedral and trihedral corner reflectors.Furthermore,far-field acoustic scattering characteristics were simulated and analyzed by the structural finite element and fluid boundary element methods.The acoustic scattering characteristics were compared with standard orthogonal corner reflectors under similar loading and acoustic field conditions.The acoustic scattering intensity of the target under different incident angles of sound waves and variation law of the target intensity with the frequency of the incident sound waves were obtained.The results showed that the acoustic scattering characteristics of orthogonal corner and orthogonal dihedral corner reflectors were better than those of non-orthogonal corner and trihedral corner reflectors,respectively.The production error of the dihedral corner reflector was less than 2°and will not have a substantial impact on the acoustic scattering characteristics.

关 键 词：水下角反射器 生产误差 结构有限元 流体边界元 声散射 目标强度 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程] TB566[交通运输工程—水声工程]