基于FPSO运动的多波形立管响应对比

Comparison of Multi-Wave Riser Response Based on FPSO Motion

基于最小势能原理建立立管非线性力学模型,应用海洋工程分析软件OrcaFlex进行数值模拟,通过控制变量法分散浮筒的布置位置,建立单波、双波和三波形立管。考虑浮式生产储泄油装置(Floating Production Storage and Offloading,FPSO)六自由度响应,对比3种波形立管垂向运动及整体von Mises应力分布,通过比较触地点动态位移判断出具有最优运动隔离效果的立管构型。结果表明:考虑浮体响应后浮筒的分散布置有利于立管垂向速度和加速度的平稳过渡;在3种波形中双波形对重点位置的张力优化效果最佳、抵抗材料发生屈曲变形的能力最强且该波形隔离浮体运动响应的效果最优。

A nonlinear mechanical model of the riser is established based on the principle of minimum potential energy,and the marine engineering analysis software OrcaFlex is used for numerical simulation.The position of the buoys is dispersed by the control variable method,and single-wave,double-wave and three-wave risers are established.Considering the six degrees of freedom response of FPSO,comparing the vertical motion and overall von Mises stress distribution of the three configurations of the riser,the riser configuration with the best motion isolation effect is determined by comparing the dynamic displacement of the hang-off point.The results show that:the dispersed arrangement of the buoys after considering the response of FPSO is conducive to the smooth transition of the vertical velocity and acceleration of the riser;of the three configurations,the double-wave configuration is of the best effect on optimizing the tension at the hot spot and is of the ability to resist buckling deformation of the material and this configuration is of the best effect on isolating the motion response of FPSO.