基于光学测量方法的柔性圆柱涡激振动响应试验

Test on Dynamic Responses of Vortex-Induced Vibration of Flexible Cylinder Using Optical Measurement

通过水槽试验研究在均匀流作用下细长柔性圆柱涡激振动的动力响应。采用一种新的光学测量方法直接测量圆柱的振动位移。分析在不同张力和约化速度下圆柱的振动位移、频谱、控制频率和运动轨迹的响应特性,得到在不同张力下完整的涡激振动锁定区间,初始分支、上端分支和下端分支等响应状态,圆柱涡激振动的锁定机制,以及张力的影响作用。

Water flume tests are conducted to investigate the dynamic responses of the vortex induced vibration(VIV)of a flexible cylinder in uniform flow.The vibration displacement of the cylinder is measured directly by a new optical method.The response characteristics of the vibration displacement,spectrum,dominant frequency and moving trail of the flexible cylinder under different tensions and reduced velocities are analyzed.The complete lock in regions of VIV are successfully excited for different tensions.The response includes initial branch,upper branch,lower branch and desynchronization regime.The lock in regime of VIV of a flexible cylinder considering the influence of the tension is obtained.