摘要
研究浸没于浅海的振动圆柱壳激发舰船地震波的传播规律,对甚低频的地震波进行仿真计算,分析水深、潜深、海面边界条件及海底介质对舰船地震波传播影响的规律。研究结果表明:频率为10 Hz时,舰船地震波的主要振动方向为垂向,且垂向加速度空间分布无指向性;浅海深度相同时,舰船地震波信号随着潜深增加单调增强;圆柱壳距离海底不变时,舰船地震波信号随着浅海深度增加而变强;海面边界条件对舰船地震波的影响随潜深增加而减小;在硬质海底中传播的舰船地震波比在软质海底中的衰减更慢,海底介质的剪切波波速对舰船地震波传播的影响比较显著,而压缩波的波速对舰船地震波的传播影响较小。
The propagation law of seismic waves excited by the vibrating cylindrical shell immersed in the shallow sea is studied.Simulation calculation of very low frequency seismic waves is performed.The law of the influence of water depth,diving depth,sea surface boundary conditions and seabed medium on the propagation of ship seismic waves is analyzed.The research results show that at 10 Hz frequency,the main vibration direction of ship seismic waves is vertical,and the spatial distribution of the vertical acceleration has no directivity.For the same depth of the shallow sea,the seismic wave signal of the ship increases monotonically with the increase of the diving depth.For the constant distance from the cylindrical shell to the seabed,the seismic wave signal of the ship becomes stronger with the increase of the shallow sea depth.The influence of sea surface boundary conditions on ship seismic waves decreases with the increase of diving depth.Ship seismic waves propagating in hard seabed decays more slowly than in soft seabed.The shear wave velocity of the seabed medium has a significant influence on the propagation of ship seismic waves,while the wave velocity of compression waves has slight effect on the propagation of ship seismic waves.
作者
黄浩
吴绍维
HUANG Hao;WU Shaowei(School of Shipping and Naval Architecture,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第4期49-53,共5页
Noise and Vibration Control
基金
国家自然科学基金青年项目资助(51909016)
重庆市教委科学技术研究重点资助项目(KJZDK202100702)
重庆市自然科学基金面上资助项目(cstc2020jcyj-msxmX0070)。
关键词
振动与波
浅海
圆柱壳
甚低频
舰船地震波
vibration and wave
shallow sea
cylindrical shell
very low frequency
ship seismic wave
