振荡剪切流作用下钢悬链线立管非线性动力分析

Nonlinear dynamic analysis of steel catenary riser under oscillating shear flow

钢悬链线立管(SCR)的非线性动力响应会在复杂的海洋环境下发生改变。以钢悬链线立管为研究对象,采用细长柔性杆理论,考虑波浪与振荡剪切流联合作用,建立钢悬链线立管运动方程并进行有限元离散,在时域中求解,编写相应计算程序,通过算例研究钢悬链线立管在波浪与振荡剪切流联合作用下的动力响应变化规律。将振荡剪切流与一般剪切流进行对比,得到突发海况下振荡剪切流对钢悬链线立管动力响应的影响规律,为复杂海洋环境下的工程设计提供依据。

The nonlinear dynamic response of the steel catenary riser(SCR)will change in complex marine environment.The SCR is used as the research object,a slender rods model is used to establish the motion equation of SCR under the combination of wave and oscillating shear flow,and a finite element method is used to solve the motion equation.The motion equation is solved in the time domain and written into a calculation and analysis program,and the dynamic response change of the SCR under the combined action of wave and oscillating shear flow is studied through the cases.The oscillating shear flow is compared with the general shear flow and the influence rule of the oscillating shear flow on the dynamic response of the SCR in the sudden sea condition is obtained.Accordingly a basis for projects design in complex marine environments is provided.