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浅海中的混响衰减
引用本文:张仁和,李文华,裘辛方,金国亮.浅海中的混响衰减[J].声学学报,1995(6).
作者姓名:张仁和  李文华  裘辛方  金国亮
作者单位:中国科学院声学研究所声场声信息国家重点实验室,中国科学院上海声学实验室
摘    要:本文定义混响衰减作为描述浅海混响的基本物理量。对不同的声速剖面和海底散射模型,分别用射线方法和WKBZ简正波方法(考虑和不考虑复本征值的影响)计算了混响衰减随时间(距离)的变化。数值模拟结果表明复本征值的影响不能忽略,在中等距离上按射线方法计算的混响衰减与考虑了复本征值影响的WKBZ方法计算结果相一致。负跃层浅海中的实验结果表明混响衰减与源和接收器的深度有关,但与带宽无关。理论预示的混响强度的几何平均规律也从实验得到了证实。


Reverberation loss in shallow water
ZHANG Renhe and LI Wenhua.Reverberation loss in shallow water[J].Acta Acustica,1995(6).
Authors:ZHANG Renhe and LI Wenhua
Abstract:In this paper, the reverberation loss is considered as a basic physical quantity to describe the shallow-water reverberation, and reverberation loss versus time was calculated by using three models: the ray-based model, the WKBZ mode models taking and not taking the effects of complex eigenvalues into account. Numerical simulations show that the effects of complex eigenvalues can not be neglected, and at medium ranges the reverberation loss from the ray-based model is consistent with that from the WKBZ mode model taking the effects of complex eigenvalues into account. The experimental results show that the reverberation loss la not dependent on the bandwidth. The reverberation in shallow water with a thermocline shows strong depth dependence, and the theoretical geometric-mean rule of reverberation intensity was demonstrated by experiment.
Keywords:V  
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