地声检测系统与海底耦合振动模型

Coupling Model for Seismoacoustic Detection System

为解决置于海底的检测系统真实接收舰船地震波信号的问题,提出了检测系统与海底沉积物之间的耦合振动形成原理。采用耦合理论,分析了检测系统和海底沉积物之间的耦合振动过程,建立了质量-弹簧-阻尼耦合振动系统模型。通过耦合模型的受力分析,得到了耦合振动系统的传递函数,其频响曲线呈现低通滤波器的特性。计算仿真和实验结果吻合,表明耦合振动系统在幅度和相位上对真实舰船地震波信号进行了调制。通过影响耦合谐振频率因素的分析,指导了检测系统的设计,提高了频带宽度,减少了耦合振动对信号接收的影响。

To solve the problem of actually acquisition of seismic wave signal of the ship′s,the coupling principle between seismo-acoustic detection system and sediments is proposed.Based on the coupling theory,the vibration coupling relation between the detection system and the sediment is analysed,the mass-spring-damp model of vibration coupling is discussed.The transfer function of coupling model is studied by the analysis of vibration equation,the frequency response shows a character of the lowpass filter.Computation results are in agreement with experimental data.The result indicates that the amplitude and the phase of seismic wave are modulated by the vibration system.The influencing factors of coupling resonance are deduced.It can help to guide the design of seismoacoustic detection system,improve the bandwidth and reduce the coupling influence.