涡激振动影响下细长海洋结构物的阻力特性

Drag Forces of Slender Marine Structures with Undergoing by Vortex-induce Vibration

利用柔性圆柱体涡激振动水池模型试验对细长海洋结构物发生涡激振动时的阻力特性进行研究。利用试验测得的圆柱体模型顺流向平均弯曲应变,结合梁复杂弯曲理论,计算出模型各截面处的平均阻力,获得沿模型轴向分布的阻力系数,分析涡激振动影响下细长海洋结构物阻力系数的变化特性。研究结论表明:均匀流下细长海洋结构物的阻力为非均布载荷,涡激振动对阻力系数具有放大效应,导致阻力系数在1.4~2.5之间变化。

The features of the drag forces of slender marine structures undergoing vortex-induced vibration are investigated using the model test of a flexible cylinder.The mean drag forces are calculated based on beam theory using the measured mean bending strains of the cylinder model,and then the drag coefficients distributed along the model＇s axis are determined.The variation characteristics of the drag coefficients for the slender marine structures undergoing vortex-induced vibration are studied.The results show that the drag forces of the slender marine structures in uniform flow are non-uniform distribution loads.Vortex-induced vibration can amplify the drag coefficient,resulting in the mean drag coefficient value is between 1.4 and 2.5.