基于波数积分的点声源海底地震波计算方法研究
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摘要
将舰船地震波简化为液固多层半无限空间低频点声源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.对硬质和软质两种海底条件下远场海底地震波信号特征的分析结果表明:随频率增大,海底表面声压的传播损失逐渐增加;软质海底的位移、加速度总体上比硬质海底大;和硬质海底相比,软质海底更有利于声源较低频率成分的传播.
The ship seismic wave is simplified to the seismic wave generated by a low frequency point sound source in a liquid-solid multi-layered half-space in this paper.Based on the wave-number integration technique,the amplitudes of acoustic pressure,displacement and acceleration on seafloor are obtained by FFP numerical evaluation technique.The characteristics of acoustic pressure,displacement and acceleration on seafloor varied with frequency are also discussed.According to calculating results,the transmission loss of acoustic pressure on seafloor decreases while frequency increasing.The displacement and acceleration of soft seabed are generally larger than that of hard seabed.Comparatively,soft seabed is advantageous for transmission of low frequency part of sound source.
The ship seismic wave is simplified to the seismic wave generated by a low frequency point sound source in a liquid-solid multi-layered half-space in this paper.Based on the wave-number integration technique,the amplitudes of acoustic pressure,displacement and acceleration on seafloor are obtained by FFP numerical evaluation technique.The characteristics of acoustic pressure,displacement and acceleration on seafloor varied with frequency are also discussed.According to calculating results,the transmission loss of acoustic pressure on seafloor decreases while frequency increasing.The displacement and acceleration of soft seabed are generally larger than that of hard seabed.Comparatively,soft seabed is advantageous for transmission of low frequency part of sound source.
引文
[1]卢再华,张志宏.舰船海底地震波及其在水雷引信中的应用[J].水雷战与舰船防护,2004(4):25-28.
[2]陈云飞,吕俊军.航行舰船地震波及其在水中目标探测中的应用[J].舰船科学技术,2005,27(3):62-66.
[3]卢再华,张志宏.浅海低频点声源作用下海底地震波的数值模拟[J].武汉理工大学学报:交通科学与工程版,2007,31(4):607-610.
[4]卢再华,张志宏.舰船海底地震波形成机理的理论分析[J].应用力学学报,2007,24(1):54-57.
[5]颜冰,周伟.浅海地震波传播的简振波模型[J].武汉理工大学学报:交通科学与工程版,2006,30(5):805-807.
[6]周伟,颜冰.舰船低频声传播的海底损失[J].噪声与振动控制,2006(2):62-65.
[7]Dinapoli F R,Deavenport R L.Theoretical and nu-merical Green's function solution in a plane layeredmedium[J].J.Acoust.Soc.Am.,1980,67(1):92-105.
[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.
[2]陈云飞,吕俊军.航行舰船地震波及其在水中目标探测中的应用[J].舰船科学技术,2005,27(3):62-66.
[3]卢再华,张志宏.浅海低频点声源作用下海底地震波的数值模拟[J].武汉理工大学学报:交通科学与工程版,2007,31(4):607-610.
[4]卢再华,张志宏.舰船海底地震波形成机理的理论分析[J].应用力学学报,2007,24(1):54-57.
[5]颜冰,周伟.浅海地震波传播的简振波模型[J].武汉理工大学学报:交通科学与工程版,2006,30(5):805-807.
[6]周伟,颜冰.舰船低频声传播的海底损失[J].噪声与振动控制,2006(2):62-65.
[7]Dinapoli F R,Deavenport R L.Theoretical and nu-merical Green's function solution in a plane layeredmedium[J].J.Acoust.Soc.Am.,1980,67(1):92-105.
[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.
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