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10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。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。
The time domain nonlinear dynamic analysis of a steel catenary riser (SCR) was introduced for fatigue life prediction.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.The dynamic response simulation of a SCR under oceanic environmental loads was carried out.The time histories of stresses were employed to predict the global riser fatigue life by use of S-N curves.Results were presented from a parametric study of the SCR with various input parameters,such as drag coefficient,buoyancy factors,seabed stiffness etc.It is shown that the predicted fatigue life is strongly dependent on these parameters.The analysis conclusions can help designers to understand the dynamic behavior of SCR and provide guidance for selection of some critical parameters used in SCR fatigue design.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第3期22-25,共4页
Journal of Vibration and Shock
基金
国家自然科学重点基金资助项目(50739004)
国家863计划资助项目(2009A09Z301)
关键词
钢悬链线立管
疲劳寿命
时域
非线性动力分析
steel catenary riser
fatigue life
time domain
nonlinear dynamic analyses
