水压场引起海底地震波的特征

将舰船水压场激励的海底地震波简化为液固多层半无限空间中集中力引起的地震波动问题,基于波数积分方法,通过FFP数值积分求解了海底表面声压、位移和加速度幅值,得到了海底表面声压、位移和加速度的频率特性曲线。结果表明,水压场激励的海底地震波频率很低,属于超低频波动信号;水压场引起海底表面的声压、竖直加速度和水平加速度在频域内基本呈现单峰型特征。

Seafloor characteristics of seismic wave caused by ship hydrodynamic pressure field

The seismic wave induced by the ship hydrodynamic pressure field was simplified to the seismic wave generated by a concentrated force applied in a liquid-solid multi-layered hemisphere. Based on the wave-amount integration technique, the curves of acoustic pressure, displacement and acceleration on the seafloor varying with frequency were obtained by FFP numerical evaluation technique. According to the calculated results, the frequency of the seismic wave induced by the ship hydrodynamic pressure is very low, or this kind of seismic wave is an ultra low frequency signal. The sound pressure, vertical acceleration and horizontal acceleration on the seafloor in frequency domain are characterized by a very low frequency value.