深海钢悬链立管时域疲劳寿命预估研究

杨和振;李华军

振动与冲击 ›› 2010, Vol. 29 ›› Issue (3) : 22-25.

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (3) : 22-25.
论文

深海钢悬链立管时域疲劳寿命预估研究

  • 杨和振1;李华军2
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Time domain Fatigue Life Prediction for Deepwater Steel Catenary riser

  • YANG He-zhen1; Li Hua-jun2

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摘要



研究了钢悬链立管(SCR)时域非线性动力分析用于疲劳寿命预估。随着海洋工业不断往深海进发,过去十年内钢悬链立管成为众多油田开发的优选方案。然而,对于钢悬链立管设计而言疲劳是个关键难题。钢悬链立管的非线性动力特性显著,与频域方法相比,时域分析能够模拟非线性水动力载荷以及结构的非线性特性。本文数值模拟了海洋环境载荷作用下SCR的非线性结构动力响应,利用S-N曲线对立管进行整体疲劳寿命预估。对影响SCR疲劳寿命的各参数进行敏感度分析,输入的敏感度分析参数包括拖曳力系数、浮力因子、海床土体硬度等,研究表明疲劳寿命的预估结果与这些参数相关,所给出的结论便于设计人员更好理解钢悬链立管动力特性,选择合适的参数用于立管疲劳设计。



Abstract


The time domain nonlinear dynamic analysis of a steel catenary riser (SCR) is proposed for fatigue life prediction. As the offshore industry moves towards deeper water, steel catenary riser (SCR) has been a successful riser solution for many oil fields in the last decade. However, fatigue is a critical issue for the SCR design. Since the behavior of the SCR is nonlinear in nature, the time domain analysis is better suited to capture the possible nonlinear effects associated with hydrodynamic nonlinearities and structural nonlinear properties than frequency domain. In this work, the simulation of SCR dynamic response due to ocean environmental loads was carried out. The time histories of stress are employed to predict the global riser fatigue life by S-N curves. Results are presented from a parametric study of the SCR to various input parameters like the drag coefficient, buoyancy factors, and seabed stiffness etc. It is shown that the predicted fatigue life is strong dependent on these parameters. The analysis conclusions can help designers to understand the dynamic behavior of the SCR and provide guidance for the selection of some critical parameters that are used in the SCR fatigue design.

关键词

钢悬链线立管 / 疲劳寿命 / 时域 / 非线性动力分析

Key words

steel catenary riser / fatigue life / time domain / nonlinear dynamic analyses

引用本文

导出引用
杨和振;李华军. 深海钢悬链立管时域疲劳寿命预估研究[J]. 振动与冲击, 2010, 29(3): 22-25
YANG He-zhen;Li Hua-jun. Time domain Fatigue Life Prediction for Deepwater Steel Catenary riser[J]. Journal of Vibration and Shock, 2010, 29(3): 22-25

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