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首页> 外文会议>International offshore and polar engineering conference;ISOPE-2009 >Fatigue Analysis of Deepwater Risers using a Hybrid Time/Frequency Domain Method
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Fatigue Analysis of Deepwater Risers using a Hybrid Time/Frequency Domain Method

机译：时频域混合法进行深水冒口疲劳分析

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Recently, coupled analysis of deepwater floating structures has come tothe forefront. Briefly, a coupled analysis entails a full model of theplatform and the connected moorings and risers, and permits thenonlinear dynamic interaction between the system components to berigorously captured. Because of the time consuming nature of coupledanalysis, usually performed in the time domain, an efficient hybridtime/frequency domain approach has been developed in a prior work.The hybrid method simulates the slow-drift responses in the timedomain and analyzes the wave-frequency responses in the frequencydomain. The analyses at the two time scales are coupled via a specialfeedback mechanism. It has been shown that the hybrid methodcompares well with fully coupled analysis, in terms of predicting thestandard deviations of the vessel motions and line tensions. In thispaper, the hybrid method is extended for fatigue analysis, which is animportant design criterion for deepwater risers. The fatigue damagecalculated by the hybrid method is found to compare favorably with theresult from fully coupled time domain analysis using the rainflowcounting algorithm.
机译：最近，对深水漂浮结构的耦合分析已成为最前沿。简而言之，耦合分析需要完整的平台模型以及所连接的系泊和立管模型，并允许精确捕获系统组件之间的非线性动态相互作用。由于耦合分析耗时的特性（通常在时域中执行），因此在先前的工作中已经开发出了一种有效的时/频域混合方法，该混合方法模拟了时域中的慢漂移响应并分析了波频响应在频域中。两个时间尺度的分析通过特殊的反馈机制进行耦合。已经表明，在预测血管运动和线张力的标准偏差方面，混合方法与完全耦合分析非常吻合。本文将混合方法扩展到疲劳分析，这是深水立管的重要设计准则。通过使用雨流计数算法的完全耦合时域分析，发现通过混合方法计算出的疲劳损伤与结果完全吻合。

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