基于粘弹性人工边界的点声源海底地震波ANSYS分析方法  

Seabed seismic wave caused by point sound source based on viscous-elastic artificial boundaries

作　　者：卢再华[1] 张志宏[1] 顾建农[1] 

机构地区：[1]海军工程大学理学院,武汉430033

出　　处：《海军工程大学学报》2011年第2期63-67,共5页Journal of Naval University of Engineering

基　　金：国家部委基金资助项目(51303030501)

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 calcu- lating 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 charac- teristic 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.

关 键 词：粘弹性人工边界 点声源 地震波 ANSYS 流固耦合 

分 类 号：P631.4[天文地球—地质矿产勘探]