Wth the above analysis of ray travel times , a new method of source localization based on ray travel tirne is presented in ans dissendion 综合以上分析，本文尝试了一种新的方法?声传播时延的匹配场声源定位，即运用最早到达的声信号在相邻基元上的时延作匹配场处理。
There are two ldnds of cost functions in the thesis , the first is based on the ray travel time delay of the adjacent hydrophones ; the second is directly based on eq travel times 文中构造了两类代价函数，第一类代价函数基于相邻基元的传播时延，第二类代价函数基于声传播时间。
Modeling the acoustic field with proper sound propagation model is necessary for the research on sound propagation in the sea and is the basis of ocean acoustic tomography 研究海洋中的声传播需要选择适当的传播模型对海洋环境进行建模，精确的传播模型也是海洋声层析研究的基础。
The data on underwater acoustic spread and ocean environment noise , obtained by the buoy system , have been kept by some navy database as ocean environment base data 浮标监测系统所获取和记录的水声传播试验数据和海洋环境噪声数据已经作为海洋环境基础数据被海军有关数据库存录。
Underwater - radio buoy system for use as obtaining the ocean ' s acoustical parameters is primary for investigating ocean acoustic condition , obtaining and recording acoustic propagation experimentation data 海洋环境参数获取浮标监测系统主要用于海洋水声环境的综合考察，获取和记录水声传播试验数据。
Abstract : in this paper the current situation and trends on the study of pipeline vibration and sound propagation are completely summarized , and the researches of this area are looked forward to the future 文摘:本文对管道振动及声传播领域的研究现状和水平分类作了比较全面的综述,并对今后开展潜艇管道振动、声传播及噪声控制的研究进行了展望。
The underwater - radio buoy for use as obtaining the ocean " s acoustical parameters , applied for synthesis experimentations that seeing about ocean underwater acoustic environment , can obtain and memorize the data of underwater acoustic transmitting experimentations 海洋环境参数获取浮标监测系统主要用于海洋水声环境的综合考察，获取和记录水声传播试验数据。
Considering the viscous interaction between the kernel and the air inside the grain the paper shows the dynamic tortuosity function in grain . considering the thermal exchanges between the kernel and the air the paper shows the dynamic permeability function in grain 考虑准多孔介质声传播中存在空气与颗粒间的粘滞力和惯性力，推导出准多孔介质中孔隙动态曲折度函数表达式。
Synthetic aperture technology origins from radar field firstly . the main reasons for its unsuccessful application in sonar are the low sound speed ( compared with light ) , irregular carrier movement and the complexity of underwater acoustic environment 合成孔径原理最早来源于雷达领域，但它在水声领域的应用远不如在雷达领域应用得成功，其原因主要在于水中相对较低的声传播速度(相对于光波波速) 、声呐载体的不规则运动和水声环境复杂性的影响。
This technology has been used widely just for its advantages of non - contract operation , non - destructive testing , broad bandwidth , high time resolution , high space resolution , no limit on sample ' s shape , one laser pulse exciting many kinds of waves and so on 由于激光超声具有非接触，时间和空间分辨率高，对样品的形状和尺寸没有特殊要求等优点，它已被广泛地应用于工业无损检测，材料的表征，以及复合材料和各向异性材料的声传播规律研究等领域。
