地声检测系统涡激振动研究及实验分析
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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。
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.
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.
引文
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[9]Kocabiyik,S.Fluid forces on transversely oscillatingcylinder[J].Applied Mathematic Letter,2000,13(4):59-64.
[2]李响,颜冰.小波谱在舰船地震波场分析中的应用[J].振动与冲击,2008(3):155-158.
[3]蔡洪滨.圆柱体的涡激升力研究及其动力响应分析[D].青岛:中国海洋大学,2006.
[4]童秉纲,尹协远,朱克勤.涡运动理论[M].北京:中国高等教育出版社,157-186.
[5]Chui,W.S.,J.H.Lienhard.On Real Fluid Flowover Yawed Circular Cylinders[J].Basic Eng,1967,89:851-870.
[6]白长旭.波流耦合作用下的立管涡激振动分析[D].大连:大连理工大学,2007.
[7]Low,H.T.,Chew,Y.T.,Tan,K.T..Fluid forceson a cylinder oscillating in line with a uniform flow[J].Ocean Engineering,1989,16(3):307-318.
[8]Blevins,Robert D.On vortex-induced fluid forces onoscillating cylinders[C].American Society ofMechanical Engineers,Pressure Vessels and PipingDivision,1999,389,p103-111.
[9]Kocabiyik,S.Fluid forces on transversely oscillatingcylinder[J].Applied Mathematic Letter,2000,13(4):59-64.
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