水下双层十字交叉组合二面角反射体  

Underwater double cross combined dihedral corner reflector

作　　者：陈文剑[1,2] 朱建军[1,2] 孙义诚 方芷菲 龚新越 张淑娟 CHEN Wenjian;ZHU Jianjun;SUN Yicheng;FANG Zhifei;GONG Xinyue;ZHANG Shujuan(College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China;National Demonstration Center for Experimental Underwater Acoustic Engineering Education(Harbin Engineering University),Harbin 150001,China)

机构地区：[1]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001 [2]水声工程国家级实验教学示范中心(哈尔滨工程大学),黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2023年第8期1382-1390,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(12074089,42176188).

摘　　要：针对单个二面角反射体目标强度的角度一致性差的问题,本文设计了一种具有水平全向强声反射特性的组合二面角反射体结构。基于二面角反射体目标强度计算公式,提出了一种适用于任意入射角度条件下的数值和解析法相结合的散射声场计算方法,利用解析法计算二面角反射体上的一次反射回波,通过数值法计算反射声波照射的不规则多边形区域,采用Gordon积分法计算不规则多边形区域的二次反射回波。研究表明:双层十字交叉组合二面角反射体由上下2个反射体构成,每个反射体都是由2个垂直平面交叉组成的二面角反射体,2个反射体沿交叉轴线旋转相差45°。在360°的方位角范围内,反射体具有高的目标强度和良好的目标强度-角度一致性。An underwater double cross combined dihedral corner reflector structure with strong horizontal omnidirectional acoustic reflection is designed to address the poor angle consistency in the target intensity of a single dihedral reflector.This paper presents numerical and analytical methods for calculating the acoustic wave incidence at any angle based on the existing formula for calculating the target intensity of a dihedral corner reflector.The method employs an analytical approach to calculate the echo of primary reflection on a dihedral corner reflector.The irregular polygonal region illuminated by reflected sound waves is calculated by the numerical method,and then the secondary reflected echo of the irregular polygonal region is calculated by the Gordon integral method.The double cross combined dihedral corner reflector comprises two reflections,and each reflector comprises two planes intersecting vertically.The two reflectors rotate along the cross axis with a difference of 45°.Theoretical calculation and experimental results revealed that the reflectors have high target intensity and good target intensity-angle consistency in the azimuthal range of 0°to 360°.

关 键 词：角反射体 目标回波 反射波 目标强度 声束弹跳方法 散射声场 回波测量 瑞利距离 

分 类 号：O427.9[理学—声学] TB566[理学—物理]