张力腿系缆系统涡激振动疲劳可靠性分析

Fatigue reliability analysis of Vortex Induced Vibration of TLP tethers in waves and current

张力腿平台的系缆系统在波流的联合作用下非常容易发生疲劳破坏。文章通过多项Galerkin方法对张力腿系缆系统的涡激振动方程进行求解,获得了系统的非线性动力响应。并综合考虑疲劳评估中相关参数和程序的不确定性,运用断裂力学的方法对系缆系统进行疲劳可靠性评估。文中还分别运用FORM和蒙特卡罗仿真对具体算例进行了计算。

The Tension Leg Platform （TLP） tethers are vulnerable to considerable fatigue damage over its design life period due to the dynamic excitations caused by Vortex Induced Vibration （VIV） in waves and current. In this paper, first the VIV equation is solved through the Galerkin method. Then, the fracture mechanics approaches are used to assess the fatigue reliability.In the assessment against fatigue failure, the uncertainties associated with the parameters and procedures employed for the fatigue damage estimation is considered. Finally, the First Order Reliability Method （FORM） and Monte Carlo Simulation Technique are used separately to calculate a numerical example.