Optimal design of asymmetrically arranged moorings in a floating production system based on improved particle swarm optimization and RBF surrogate model

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2024-01-17 DOI:10.1016/j.marstruc.2024.103576

Yang Yu , Mingren Zhao , Zhenmian Li , Baolei Zhang , Haoxue Pang , Lixin Xu

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引用次数: 0

Abstract

In offshore oil and gas production, the increasingly complex line system and relatively fixed incidence direction of external loadings have led to asymmetrically distributed mooring lines in floating production systems (FPSs). This study presents an approach for the optimal design of asymmetrically arranged mooring systems in FPSs, considering the mooring radius, azimuth, separate angle, number of lines and three segment lengths as design variables. A series of sample mooring configurations were generated via the constrained Latin hypercube sampling method and executed by a time-domain numerical model. An improved particle swarm optimization (PSO) method involving both continuous and discrete design variables in a constrained design space was applied to mooring optimization. The radial basis function (RBF) model was trained by the sample data and applied as a surrogate model to replace the expensive finite element simulations. A case study of a deep-water semisubmersible platform was presented to demonstrate the implementation of the optimization procedure. The results showed that the improved PSO exhibited fast convergence and strong robustness. The offset of the floating platform was reduced by 8.29 % via the asymmetrical mooring pattern.

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基于改进的粒子群优化和 RBF 代理模型的浮式生产系统中不对称系泊的优化设计

在近海石油和天然气生产中，越来越复杂的缆线系统和相对固定的外部载荷入射方向导致浮式生产系统（FPS）中缆线的非对称分布。本研究以系泊半径、方位角、分离角、缆线数量和三段长度为设计变量，提出了一种对 FPS 中不对称布置的系泊系统进行优化设计的方法。通过受约束拉丁超立方采样法生成了一系列系泊配置样本，并由时域数值模型执行。改进的粒子群优化（PSO）方法涉及约束设计空间中的连续和离散设计变量，被应用于系泊优化。通过样本数据训练了径向基函数（RBF）模型，并将其用作替代模型，以取代昂贵的有限元模拟。以深水半潜式平台为例，演示了优化程序的实施。结果表明，改进后的 PSO 具有收敛快、鲁棒性强的特点。通过非对称系泊模式，浮动平台的偏移量减少了 8.29%。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.