APPLICATION OF PEAK DISTRIBUTION METHOD FOR RESPONSE BASED ANALYSIS OF MOORING LINES UNDER TROPICAL STORMS

机译：峰值分布法在热带风暴下系泊线响应分析中的应用

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Response based analysis (RBA) is a comprehensive approach for the prediction of extreme responses and design metocean conditions of offshore facilities. For RBA, the structural system needs to be modelled, and its behavior analyzed when subjected to large metocean datasets, usually comprising thousands of different sea states. Due to the dynamic and nonlinear behavior of mooring systems in floating structures, application of conventional time domain analysis for RBA of these systems is a computationally demanding process. Hence, investigation of faster solvers and more efficient methods for the RBA is inevitable. Peak distribution method (PDM), which has recently been introduced and used for response analysis of mooring systems under extreme design conditions, is a possible solution to reduce the computational efforts in RBA by reducing the number of simulations. This study explores the utilization of the PDM for RBA of the mooring system of a turret-moored large FPSO subjected to tropical storms. Large variability of metocean parameters within such storms limits the applicability of intuitive judgement for the selection of governing sea states. The results are compared through both time-domain and frequency-domain simulations and a computationally efficient methodology is proposed. It provides a general robust framework of computing the extreme value distribution of the system response. The proposed methodology can be used for RBA of mooring lines tension under storm conditions comprising large number of sea states.

机译：基于响应的分析（RBA）是一种预测离岸设施的极端响应和设计元条件的综合方法。对于RBA，需要进行建模结构系统，并且在经受大型换货数据集时分析的行为通常包括数千个不同的海状态。由于系泊系统在浮动结构中的动态和非线性行为，对于这些系统的RBA的传统时域分析的应用是一种计算要求苛刻的过程。因此，对RBA的更快的求解器和更有效的方法进行调查是不可避免的。最近被引入并用于极端设计条件下的系泊系统响应分析的峰值分布方法（PDM）是通过减少模拟次数来减少RBA中的计算工作的可能解决方案。本研究探讨了PDM的利用炮层停泊的大型FPSO的系泊系统的RBA的利用。这种风暴中的各个地区参数的大幅变化限制了直观判断的适用性，以选择管理海洋州。通过时间域和频域模拟进行比较结果，并提出了计算有效的方法。它提供了一种计算系统响应的极值分布的一般稳健框架。所提出的方法可以用于在包含大量海态的风暴条件下的系泊线张力的RBA。

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《International Conference on Ocean, Offshore and Arctic Engineering》|2020年|V001T01A023.1-V001T01A023.9|共9页
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A. Ghasemi; Y. Drobyshevski; M. Kimiaei; M. Efthymiou;
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Response Based Analysis; Peak Distribution Method; Turret-Moored FPSO; Mooring Lines;

机译：基于响应的分析;峰值分布方法;炮塔系泊FPSO;系泊线;

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APPLICATION OF PEAK DISTRIBUTION METHOD FOR RESPONSE BASED ANALYSIS OF MOORING LINES UNDER TROPICAL STORMS

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