| 非线性内波存在下的浅海远程混响模型 |
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| 引用本文： | 张荣瀚,李琪.非线性内波存在下的浅海远程混响模型[J].声学学报,2013,38(5):548-554. |
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| 作者姓名： | 张荣瀚 李琪 |
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| 作者单位： | 哈尔滨工程大学 水声技术重点实验室 哈尔滨 150001 |
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| 摘 要： | 研究了浅海非线性内波对远程混响场的影响。通过分析非线性内波活动引起声源到海底散射元以及散射元到接收点之间的声传播变化,给出了非线性内波引起远程混响强度变化的表示,建立了非线性内波存在下的浅海远程混响模型,数值计算了非线性内波运动引起远程混响强度的变化。理论和数值计算表明,非线性内波的活动能够引起远程混响强度的变化,在某些情况下会导致远程混响强度增强。通过讨论非线性内波引声简正波的耦合效应,给出了其引起远程混响强度增强的原因。
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| 关 键 词： | 非线性 内波 简正波 数值计算 混响场 混响强度 远程 声传播 海底散射 声速剖面 |
| 收稿时间： | 2011-12-26 |
Long range reverberation model in case of nonlinear internal wave in shallow water |
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| ZHANG Ronghan,LI Qi.Long range reverberation model in case of nonlinear internal wave in shallow water[J].Acta Acustica,2013,38(5):548-554. |
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| Authors: | ZHANG Ronghan LI Qi |
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| Institution: | Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University Harbin 150001 |
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| Abstract: | Nonlinear internal wave effect on the long range low frequency reverberation is studied in shallow water. Fluctuation of sound energy propagation from sound source to scattering element of seabed and from scattering element to receiver caused by nonlinear internal wave is analyzed,which caused fluctuation of long range reverberation.A model of normal modes reverberation with nonlinear internal wave in shallow water is given in this paper.Using a nonlinear internal wave sample,internal wave effect on long range low frequency reverberation was numerical simulated. Numerical simulation results show that the nonlinear internal wave can lead long range reverberation to boost.Normal mode coupling caused by this nonlinear wave was analyzed and the reason of range reverberation enhanced was given. |
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