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On the long-term fatigue assessment of mooring and riser systems

机译：关于系泊和立管系统的长期疲劳评估

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摘要

Mooring lines and risers are exposed to numerous sea states during its service life, thus a fatigue assessment should account for the long-term wave condition which is typically represented by the joint statistics of the significant waveheight and a characteristic period. Since it is unfeasible to consider all possible sea states, a common practice, as recommended by design codes, is the lumping of sea states into blocks. However, there are neither guidelines nor consensus on an effective blocking strategy, and the level of discrepancy arising from blocking has not been investigated. In fact, the present problem can be treated by a variety of techniques that are fairly standard within the specialist field of uncertainty analysis, but these methods are foreign to many practicing engineers. Therefore, this paper seeks to make the methodology accessible to the wider offshore engineering community. Six existing approaches are implemented on an illustrative floating system and evaluated for accuracy and efficiency. This paper also presents a novel customized approach that is fast and precise. The approach adopts a multi-peaked third-order asymptotic approximation that is rarely seen in the literature. The peaks are located by a tailored optimization algorithm that exploits the problem peculiarities.
机译：系泊缆绳和立管在使用寿命期间会暴露在众多海况下，因此疲劳评估应考虑长期的波浪状况，这通常由重要波浪高度和特征周期的联合统计来表示。由于不可能考虑所有可能的海况，因此，按照设计规范的建议，通常的做法是将海况混为一谈。但是，对于有效的阻止策略，既没有指导方针也没有共识，并且尚未研究因阻止而引起的差异程度。实际上，当前的问题可以通过不确定性分析专业领域中相当标准的各种技术来解决，但是这些方法对于许多从业工程师都是陌生的。因此，本文旨在使该方法可为更广泛的海上工程界使用。在说明性的浮动系统上实现了六种现有方法，并对其准确性和效率进行了评估。本文还提出了一种新颖，快速，精确的定制方法。该方法采用了多峰三阶渐近近似，这在文献中很少见。通过利用问题特殊性的量身定制的优化算法来定位峰。

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