基于粘弹性人工边界的点声源海底地震波ANSYS分析方法
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摘要
航行舰船在海底岩土层中引起的弹性波被称为舰船地震波,该波主要由舰船低频辐射噪声引起,可用于识别舰船目标。采用大型有限元软件ANSYS中的流固耦合计算模块,结合粘弹性人工边界条件,对水平分层海洋环境下低频点声源海底地震波进行了数值计算。数值计算结果与波数积分方法结果的比较表明:两种方法相应的声传播损失曲线和频率特性曲线变化规律基本一致,海底表面竖直位移、水平位移、竖直加速度和水平加速度的频率特性曲线吻合较好,说明大型有限元软件ANSYS中的流固耦合模块可用于低频点声源海底地震波问题的数值计算。
The seabed elastic wave caused by the low frequency noise of the sailing ship is called ship seismic wave,which can be used to identify a ship target.A numerical calculation of seabed seismic wave caused by the low frequency point sound source was done by using the liquid-solid coupled calculating module of ANSYS in combination with the viscous-elastic artificial boundaries.The results of the numerical calculating method were compared with those of the wave-number integration technique in order to evaluate the accuracy of the numerical calculating method above.Both the transmission loss of sound pressure vs.range and the characteristic curves of acoustic pressure vary with frequency are basically consistent as far as the two methods are concerned.Furthermore,the frequency characteristic curves of displacement and acceleration on the seabed surface both in the vertical and the horizontal directions are also basically in agreement.The numerical calculating method for seabed seismic wave caused by low frequency point sound source is feasible on the basis of the above comparison.
The seabed elastic wave caused by the low frequency noise of the sailing ship is called ship seismic wave,which can be used to identify a ship target.A numerical calculation of seabed seismic wave caused by the low frequency point sound source was done by using the liquid-solid coupled calculating module of ANSYS in combination with the viscous-elastic artificial boundaries.The results of the numerical calculating method were compared with those of the wave-number integration technique in order to evaluate the accuracy of the numerical calculating method above.Both the transmission loss of sound pressure vs.range and the characteristic curves of acoustic pressure vary with frequency are basically consistent as far as the two methods are concerned.Furthermore,the frequency characteristic curves of displacement and acceleration on the seabed surface both in the vertical and the horizontal directions are also basically in agreement.The numerical calculating method for seabed seismic wave caused by low frequency point sound source is feasible on the basis of the above comparison.
引文
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[2]陈云飞,吕俊军.航行舰船地震波及其在水中目标探测中的应用[J].舰船科学技术,2005,27(3):62-66.CHEN Yun-fei,L Jun-jun.The ship-induced seismic wave and its application in the underwater target detection[J].Ship Science and Technology,2005,27(3):62-66.(in Chinese)
[3]颜冰,周伟.浅海地震波传播的简正波模型[J].武汉理工大学学报,2006,30(5):805-807.YAN Bing,ZHOU Wei.A normal mode model for ocean seismo-acoustics in shallow water[J].Journal of WuhanUniversity of Technology,2006,30(5):805-807.(in Chinese)
[4]周伟,颜冰.舰船低频声传播的海底损失[J].噪声与振动控制,2006(2):62-65.ZHOU Wei,YAN Bing.Bottom loss of the ship′s low frequency noise from a horizontally stratified sea bottom[J].Noise and Vibration Control,2006(2):62-65.(in Chinese)
[5]卢再华,张志宏,顾建农.不同浅海环境下点声源海底地震波特征研究[J].声学技术,2009,28(5):596-600.LU Zai-hua,ZHANG Zhi-hong,GU Jian-nong.Characteristics of seismic wave in seabed caused by point soundsource in various shallow sea conditions[J].Technical Acoustics,2009,28(5):596-600.(in Chinese)
[6]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.LIU Jing-bo,WANG Zhen-yu,DU Xiu-li,et al.Three-dimensional viscous-elastic artificial boundaries in time do-main for wave motion problems[J].Engineering Mechanics,2005,22(6):46-51.(in Chinese)
[7]张小玲,栾茂田,郭莹,等.海底管线地震应力影响分析[J].海洋工程,2008,26(2):83-89.ZHANG Xiao-ling,LUAN Mao-tian,GUO Ying,et al.Analysis on the effects of dynamic response of submarinepipeline under seismic loading[J].The Ocean Engineer,2008,26(2):83-89.(in Chinese)
[8]刘伯胜,雷家熠.水声学原理[M].哈尔滨:哈尔滨工程大学出版社,1993.
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