题名超低频水声传播理论建模研究
作者鹿力成
学位类别博士
答辩日期2007-05-31
授予单位中国科学院声学研究所
授予地点声学研究所
关键词超低频 横波 最大深度
其他题名Model Research on Very-Low-Frequency Underwater Propagation
学位专业声学
中文摘要近年来,超低频水声传播越来越得到水声界的重视。海底是影响超低频水声传播的重要因素。理论上需要知道所有深度的参数特性才能确定声传播,但是这很不现实。如果在误差允许的范围内只需要知道某个深度以上参数特性就可以,则定义为最大深度。通过数值模拟和实验分析,超低频水声传播最大深度可达十几米—几十米。 根据Hamilton的海底类型分类,深海海底一般可看作液态海底,而浅海则相对复杂。当在最大深度内海底横波速度较小时,可看作液态海底,然而超低频声波较长,因此很多情况下不能忽略海底的横波对声传播的影响。同样分析在海底变化情况下,超低频声传播模型建立和声场分布情况。在南海实验分析中,利用最大深度的经验公式,实验数据和数值模拟符合很好,而且在超低频100Hz时海底作弹性海底处理与实验数据吻合。
英文摘要Recently, underwater sound propagation of very low frequency (VLF) attracts greater attention in committee of underwater acoustic. The parameters of seabed are the crucial factor on sound propagation of VLF in shallow water. In principle, to determinate sound propagation requires knowledge of physical parameters at all depths, but it’s an unattainable omniscience. We can define the maximum depth to which this knowledge is necessary in order to hold the fractional errors. By numerical modal and experimental analysis, the maximum depth of VLF can reach as long as several tens of meters. According to the seabed category of Hamilton, the seabed of deep sea can be treated as liquid, while shallow water relative complex. When the shear wave velocity is small above the maximum depth, the seabed can be treated as liquid. However, VLF wavelength is longer, in some case the shear wave acts important effect on sound propagation. The VLF propagation model and field are also discussed in range-dependent environment. In the analysis of south sea experiment, the model and data are matched well by using experience formula of maximum depth. Only if the seabed is treated as elastic at 100Hz, the model is suited with data.
语种中文
公开日期2011-05-07
页码83
内容类型学位论文
源URL[http://159.226.59.140/handle/311008/226]  
专题声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文
推荐引用方式
GB/T 7714
鹿力成. 超低频水声传播理论建模研究[D]. 声学研究所. 中国科学院声学研究所. 2007.
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