基于简正波模型的浅海最佳频率的深度特性仿真研究  

Simulation study of depth characteristics of optimum frequency for acoustic propagation in shallow water based on normal mode model

作　　者：窦雨芮 周其斗[1] 谭路[1] 纪刚[1] Dou Yurui;Zhou Qidou;Tan Lu;Ji Gang(College of Naval Architecture and Ocean Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学舰船与海洋学院

出　　处：《中国舰船研究》2019年第S01期90-98,共9页Chinese Journal of Ship Research

摘　　要：[目的]海底和海面边界条件不同导致声场能量分布不均匀,浅海声传播的最佳频率在深度方向也存在较大差异。为了研究最佳频率在深度方向分布的规律,[方法]采用简正波方法研究浅海声传播最佳频率的深度特性,通过改变海水深度、海底参数、海面粗糙度和声速剖面,研究声源位于海水中间层及其他位置时不同深度接收点的最佳频率的变化规律。[结果]结果表明,当声源位于海水中间层附近时,海水中间层存在一段最佳频率随接收点深度变化且保持不变的区域,该区域厚度在海水深度变化时近似为海水深度的一半,与海底参数和海面粗糙度关系较小。[结论]研究结果说明浅海存在一个梯形区域,该区域内的最佳频率不随声源和接收点相对位置的变化而变化,所得结论可以对水声通信技术和潜艇隐身性能的发展提供一定的帮助。[Objectives]The difference between the sea bottom and sea surface boundary conditions cause the uneven distribution of sound field energy,and the optimum frequency of acoustic propagation in shallow water also varies greatly in depth.In order to optimize the underwater acoustic communication and sonar detection,[Methods]the normal mode method was used for the study on the depth characteristics of optimum frequency for acoustic propagation in shallow water,and the change law of optimum frequency was studied through the change of seawater depth,sea-bottom parameters,sea surface roughness and sound speed profiles while the sound source was located at middle depth and other places.[Results]The results show that while the sound source is located near middle depth,there is an area where the optimum frequency would remain the same when the receiver depth changes,and the thickness of this area is about half of the depth of seawater when the depth of the seawater changes,which has little relationship with the sea-bottom parameters and the sea surface roughness.[Conclusions]It is concluded that there is a trapezoidal area in shallow water,where the optimum frequency stays the same while the relative location between the sound source and the receiver changes.The discovery of this phenomenon is helpful to the development of underwater acoustic communication technology and submarine stealth performance.

关 键 词：浅海声传播 简正波 接收点深度 最佳频率 

分 类 号：U661.44[交通运输工程—船舶及航道工程]