基于原型监测的悬链线式系泊系统可靠性评估方法  

Reliability assessment model of catenary mooring system based on prototype monitoring

作　　者：于思源 程丛志 武文华[1,2] YU Si-yuan;CHENG Cong-zhi;WU Wen-hua(State Key Laboratory of Structure Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China;Ningbo Institute of Dalian University of Technology,Ningbo 315000,China)

机构地区：[1]大连理工大学工业装备与结构分析国家重点实验室,辽宁大连116024 [2]大连理工大学宁波研究院,浙江宁波315000

出　　处：《船舶力学》2024年第10期1570-1587,共18页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(U1906233);山东省联合基金资助项目(2019JZZY010801);深圳市自由探索类基础研究项目(2021Szvup021);高等学校基本科研业务费资助项目(DUT20ZD213)。

摘　　要：系泊系统是浮式平台装备的关键结构,对保障平台的安全生产具有重要作用,及时了解和评估系泊系统的安全状态和风险等级具有重要意义。针对在平台现场作业环境下对系泊链实时在位检测的困难,本文提出一种基于现场监测信息的悬链线式系泊系统可靠性评估方法,相较于传统的蒙特卡洛模拟,本文方法可以大大提高计算效率,以满足可靠性实时评估的要求。首先,基于悬链线方程引入海流载荷的影响,开展系泊链受力行为的仿真分析;进而,提出基于改进蒙特卡洛(EMC,Enhanced Monte Carlo)方法的系泊强度可靠性与疲劳可靠性评估方法;最后,基于南海某半潜式平台的实测数据,对平台的系泊链可靠性进行评估,同时考虑腐蚀的影响。结果表明,本文所提出的系泊可靠性实时评估方法可以为悬链线式系泊系统的在位安全评估与维护提供指导。The mooring system is the key structure of a floating platform,which plays an important role in ensuring the safe production of the platform.It is of profound significance to understand and evaluate the safety status and risk level of the mooring system in time.Aiming at the difficulties of real-time in-situ detection of mooring lines under the platform field operation states,a reliability assessment method of catenary mooring system based on prototype monitoring information is proposed in this paper.Compared with the conventional Monte Carlo simulation,the proposed reliability assessment model can improve the calculation efficiency to meet the requirements of real-time reliability analysis.Firstly,based on the catenary equation,a numerical simulation analysis of the forcing behavior of the mooring line was performed considering the influence of the current load.Then,a reliability assessment modelling method for strength analysis and fatigue analysis of mooring system was proposed based on Enhanced Monte Carlo(EMC)method.Finally,based on the prototype monitoring data of a semi-submersible platform in the South China Sea,the reliability assessment of the mooring line was performed by taking into consideration the impact of the corrosion.The simulated results indicate that the present real-time reliability assessment method could provide a superior ability for the guidance of the safety assessment and maintenance of catenary mooring system.

关 键 词：悬链线式系泊系统 可靠性分析 原型监测 EMC方法 

分 类 号：U653.2[交通运输工程—港口、海岸及近海工程]