海底掩埋体上地震波衰减规律研究

Study on Attenuation Law of Seismic Waves on the Submarine Buried Body

沉底水雷掩埋于海底沉积物中,可提高其隐蔽性,但会使水雷引信接收到的目标信号的强度有明显减弱,若目标信号通过地震波进行传播,则信号强度损失小。针对这一问题,本文采用有限元法,利用ANSYS/LS-DYNA有限元软件对三维无限海洋模型及海底掩埋体进行建模,利用该模型对低频点声源引起的舰船地震波进行仿真计算,得到舰船地震波在海底掩埋体上水平方向与垂直方向的时间-振幅曲线,并利用实验结果与仿真结果进行对比,二者振幅的衰减规律基本一致,验证了仿真结果的正确性。

When the ground mine is buried in the submarine sediments,its concealment will be increased,but the intensity of the target signal which is received by the mine fuse will be significantly weakened.If the target signal propagates by the seismic wave,the loss of the signal intensity will be less.Aiming at this problem,this paper uses finite element method and the ANSYS/LS-DYNA finite element software to model the three-dimensional infinite ocean model and the seabed buried body.The model is used to simulate the ship′s seismic wave which is caused by low frequency point source.We can get the time-amplitude curve of the ship′s seismic wave in the horizontal direction and the vertical direction of the seabed buried body.Then use the experimental result to contrast with the simulation result.The attenuation rule of the amplitude is basically the same.By analysising the simulation result,we can find the attenuation rule of the seismic wave on the seabed buried body.