峰值分布法在热带风暴条件下系泊索响应分析中的应用

A. Ghasemi, Y. Drobyshevski, M. Kimiaei, M. Efthymiou
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引用次数: 2

摘要

基于响应的分析(RBA)是一种用于海洋设施极端响应预测和海洋环境条件设计的综合方法。对于RBA,需要对结构系统进行建模,并在受到大型海洋数据集(通常包括数千种不同的海况)的影响时分析其行为。由于浮式结构系泊系统的动力学和非线性特性,对这些系统的RBA应用传统的时域分析是一个计算量很大的过程。因此,研究更快的求解器和更有效的RBA方法是不可避免的。峰值分布法(PDM)最近被引入并用于极端设计条件下系泊系统的响应分析,是通过减少模拟次数来减少RBA计算量的可能解决方案。本研究探讨了PDM在受热带风暴影响的炮塔系泊大型FPSO系泊系统RBA中的应用。在这种风暴中,海洋参数的大变异性限制了直觉判断选择控制海况的适用性。通过时域和频域仿真对结果进行了比较,提出了一种计算效率高的方法。它提供了一个计算系统响应极值分布的通用鲁棒框架。该方法可用于包含大量海况的风暴条件下系泊索张力的RBA。
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Application of Peak Distribution Method for Response Based Analysis of Mooring Lines Under Tropical Storms
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.
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