液固半无限空间低频点声源的地震波动

将舰船地震波简化为液固半无限空间低频点声源引起的地震波动,基于简正波理论,通过计算围道内的留数得到了位移势函数的表达式.分析了液体层内声传播损失和固体层表面的位移、加速度的频率特性曲线,为分析舰船地震波的形成机理以及波动特征提供了一定的理论基础.

Seismic Wave by Low Frequency Point Sound Source in Liquid-solid Layered Hemisphere

The elastic wave in seabed excited by low frequency noise of sailing vessel is so-called ship seismic wave that can be used to identify ship target. The ship seismic wave is simplified to the seismic wave generated by a low frequency point sound source in a liquid-solid layered hemisphere. Based on the normal mode theory, the expressions of displacement potential functions are obtained by evaluating the residue round a contour. With these functions, the variation of propagation loss of sound press with distance in liquid layer is analyzed. The characteristic of displacement and acceleration on the solid layer surface varying with frequency are also discussed.