水压场引起海底地震波的特征
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摘要
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。
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.
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.
引文
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[5]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)
[6]卢再华,张志宏,顾建农.舰船地震波形成机理初探[J].声学技术,2004(增刊):26-33.LU Zai-hua,ZHANG Zhi-hong,GU Jiang-nong.Preliminary exploration of formation mechanism about seismicwave caused by a ship[J].Technical Acoustics,2004(Supplement):26-33.(in Chinese)
[7]JENSEN F B,KUPERMAN W A,PORTER M B.Computational Ocean Acoustics[M].New York:AIP Press,1993.
[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.
[9]张志宏,龚沈光,郑学龄.超临界航速船舶水压场[J].海军工程大学学报,2000,12(2):28-31.ZHANG Zhi-hong,GONG Shen-guang,ZHENG Xue-ling.Hydrodynamic pressure field of ship sailing at super-critical speed[J].Journal of Naval University of Engineering,2000,12(2):28-31.(in Chinese)
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