粘弹性海底的浅海声场建模与分析
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- 英文论文题名：Modeling and analysis of the acoustic field in shallow water with viscoelastic seabed
- 论文作者：钱治文 ; 商德江
- 英文论文作者：QIAN Zhi-wen ; SHANG De-jiang ; Acoustic Science and Technology Laboratory ; Engineering University ; College of Underwater Acoustics Engineering ; Harbin Engineering University
- 年：2016
- 作者机构：哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
- 论文关键词：粘弹性海底 ; 声衰减 ; 简正波 ; 格林函数
- 英文论文关键词：viscoelastic seabed ; acoustic attenuation ; normal mode ; Green function
- 会议召开时间：2016-10-28
- 会议录名称：2016年全国声学学术会议论文集
- 语种：中文
- 分类号：P733.2
- 学会代码：OGSM
- 会议名称：2016年全国声学学术会议
- 会议地点：中国湖北武汉
- 主办单位：中国声学学会
- 学会名称：中国声学学会
- 页数：4
- 文件大小：444k
- 原文格式：D
- 会议级别：全国
摘要
本文重点考虑了浅海海底的声衰减问题,并把浅海海底模拟为粘弹性介质,利用地声模型参数与界面波阻抗之间的关系,结合信道环境中的点源格林函数,建立了基于简正波法的浅海声场传播理论模型。利用本文的理论模型研究分析了粘弹性参数对浅海声传播特性的影响,结果表明:粘弹性海底压缩波衰减对近距离声传播的影响比较小,对远距离声传播的影响比较大,海底介质密度的影响作用则相反;压缩波波速和切变波波速对所有声传播距离都有显著影响,切变波衰减的影响基本可以忽略。
In consider of the acoustic attenuation of shallow water seabed, the seabed is simulated as a viscoelastic medium in this paper. The theory model of sound field propagation based on normal model is established by contacting the interface wave impedance and the geoacoustic model parameters and combining with the point source Green's function in shallow water. And then,the theory model is applied to analyze the effect of the parameters on sound propagation in shallow water. The results show that the near-distance acoustic propagations is affected minutely by the changes of compression wave attenuation of the viscoelastic seabed, but the impact on long-distance acoustic propagation is relatively greatly. And the influence law of density of seabed is opposite to the density and compression wave attenuation. The acoustic propagation in the whole space could be affected by the compression wave velocity, but the impact of the shear wave attenuation could be negligible.
In consider of the acoustic attenuation of shallow water seabed, the seabed is simulated as a viscoelastic medium in this paper. The theory model of sound field propagation based on normal model is established by contacting the interface wave impedance and the geoacoustic model parameters and combining with the point source Green's function in shallow water. And then,the theory model is applied to analyze the effect of the parameters on sound propagation in shallow water. The results show that the near-distance acoustic propagations is affected minutely by the changes of compression wave attenuation of the viscoelastic seabed, but the impact on long-distance acoustic propagation is relatively greatly. And the influence law of density of seabed is opposite to the density and compression wave attenuation. The acoustic propagation in the whole space could be affected by the compression wave velocity, but the impact of the shear wave attenuation could be negligible.
引文
[1]Finn B.Jensen,William A.Kuperman,Michael B.Porter,et al.Computational Ocean Acoustics[M].1994,337-453.
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[5]张歆,张小莉,李斌.基于Kraken简正波模型的浅海声场分析[J].西北工业大学学报,2008,18(3):405-409.
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[8]卢再华,张志宏,顾建农.基于波数积分的点声源海底地震波计算方法研究[J].武汉理工大学学报,2011,35(1):118-122.
[9]Duncan A J,Gavrilov A N,Mccauley R D,et al.Characteristics of sound propagation in shallow water over an elastic seabed with a thin cap-rock layer[J].Journal of the Acoustical Society of America,2013,134(1):207-215.
[10]何祚镛,赵玉芳.声学理论基础[M].北京:国防工业出版社,1981,353-403.
[2]惠俊英,生雪莉.水下声信道[M].北京:国防工业出版社,2007,16-36.
[3]Tolstory,I.Guided Wave in a Fluid with Continuously Variable Velocity Overlying an Elastic Solid[J].J.Acoust.Soc.Am,2003,32-81.
[4]Spitznogle,F.R.,and E.G.Mcleroy.Propagation at Short Ranges of Elastic Wave from an Impulsive Source near a Fluid Two-Layer Solid Interface[J].J.Acoust.Soc.Am,1963,35-80.
[5]张歆,张小莉,李斌.基于Kraken简正波模型的浅海声场分析[J].西北工业大学学报,2008,18(3):405-409.
[6]崔国平,李志舜.F湖水声场FFP基建模研究[J].哈尔滨工程大学学报,2002,23(6):12-15.
[7]Steven J.Hughes,Dale D.Ellis,David M.F.et al.Low-frequency acoustic propagation loss in shallow water over hard-rock seabed covered by a thin layer of elastic-solid sediment[J].J.Acoust.Soc.Am,1990,105-120.
[8]卢再华,张志宏,顾建农.基于波数积分的点声源海底地震波计算方法研究[J].武汉理工大学学报,2011,35(1):118-122.
[9]Duncan A J,Gavrilov A N,Mccauley R D,et al.Characteristics of sound propagation in shallow water over an elastic seabed with a thin cap-rock layer[J].Journal of the Acoustical Society of America,2013,134(1):207-215.
[10]何祚镛,赵玉芳.声学理论基础[M].北京:国防工业出版社,1981,353-403.