随机荷载下陡波形立管的非线性动力分析

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摘要对陡波形立管在随机荷载作用下的非线性动力响应进行了数值分析。考虑内部流体，基于柔性杆理论建立了陡波形立管的数值模型，采用Newmark-β法求解立管动力响应，利用MATLAB编写相应计算程序DRSWR，将DRSWR的计算结果与OrcaFlex进行对比验证，然后对陡波形立管在随机波浪、顶部浮体随机运动共同激励下的应力响应进行了参数敏感性分析。研究结果表明：浮子段应力水平、应力变化幅值最高；应力极值点为拱弯点和垂弯点；大波高、低周期的波浪会导致立管整体应力水平急剧升高；平均静偏移增大导致立管应力极值减小；大幅高频的慢漂运动会使悬挂点应力显著增大；高密度、高流速内部流体会使陡波形立管处于高应力状态。

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	顾洪禄
	李效民
	郭海燕
	崔鹏
	刘震
	李福恒

关键词 ：陡波形立管, 柔性杆模型, 非线性动力分析, 应力, 敏感性分析

Abstract：Numerical investigation was conducted for the nonlinear dynamic analysis of steep wave riser (SWR) under random load. The numerical model of SWR with internal flow was established based on the slender rod model. The Newmark-β method was adopted to solve the dynamic behavior of SWR. A corresponding calculation process, DRSWR, was programmed with MATLAB. Calculation results were compared with those of OrcaFlex to verify the accuracy and reliability of DRSWR. Furthermore, the parametric sensitivity analysis of SWR stress under the combination excitation of random wave and top floater motion was obtained. The analysis results show that the buoyancy section of SWR has the highest global stress level and stress variation amplitude. The peak points of stress are located at the arc bend point and sag bend point. Random wave with large significant wave height and low period can cause a sharp increase in the global stress level. An increase in the mean offset leads to a decrease in stress extremes. Low frequency motion, with a large magnitude and high frequency, can significantly increase the stress of hang-off point. SWR shows high stress under high-density, high-flow velocity internal flow.

Key words： steep wave riser slender rod model nonlinear dynamic analysis stress sensitivity analysis

收稿日期: 2020-08-25 出版日期: 2022-02-15

引用本文:

顾洪禄，李效民，郭海燕，崔鹏，刘震，李福恒. 随机荷载下陡波形立管的非线性动力分析[J]. 振动与冲击, 2022, 41(3): 316-324.
GU Honglu， LI Xiaomin， GUO Haiyan， CUI Peng， LIU Zhen， LI Fuheng. Nonlinear dynamic analysis of SWR under random load. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(3): 316-324.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I3/316

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