Abstract: Based on the principle and equation of vortex induced vibration (VIV), a vibration model of a cylindrical parts in the seismo-acoustic detection system is established, and the non-linear vibration equation is deduced and solved. The abnormal vibration in the signal is studied by comparing the experimental data. It is found that the bottom current induces the vibration of mounting pole outside the sealed cabin, so that the vibrating sensor receives this VIV signal. For this sake, the VIV suppression method, which can improve the design of detection system, is developed.

Key words: vibration and wave, ship seismic-wave field, oscillating cylinder, wave and current coupling, VIV

摘要： 为了研究水流对水底检测系统的影响，从涡激振动的原理及其作用力的表达式出发，建立检测系统圆柱杆件涡激振动的理论模型及振动微分方程，求解非线性振动微分方程，得到涡激振动的频率及振幅表达式。进行实验数据对比，解释舰船地震波场测试数据中异常的振动成分，表明检测系统上的圆柱杆件因受底流扰动形成涡激振动进而激励检测系统，从而使传感器接收到明显的涡激振动信号。针对涡激振动产生原理，提出抑制涡激振动的措施。

关键词: 振动与波, 舰船地震波场, 振荡圆柱体, 波流耦合, 涡激振动