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。展开更多
Owing to the particularity of a polyester fiber material,the polyester mooring undergoes large axial tensile deformation over long-term use.Large axial tensile deformation significantly impacts the dynamic response of...Owing to the particularity of a polyester fiber material,the polyester mooring undergoes large axial tensile deformation over long-term use.Large axial tensile deformation significantly impacts the dynamic response of the mooring system.In addition,the degrees of large axial tension caused by different elastic moduli are also different,and the force on the mooring line is also different.Therefore,it is of great significance to study the influence of elastic modulus on the dynamic results of the mooring systems under large axial tension.Conventional numerical software fails to consider the axial tension deformation of the mooring.Based on the theory of slender rods,this paper derives the formula for large axial tension using the method of overall coordinates and overall slope coordinates and provides the calculation programs.Considering a polyester mooring system as an example,the calculation program and numerical software are used to calculate and compare the static and dynamic analyses to verify the reliability of the calculation program.To make the force change of the mooring obvious,the elastic moduli of three different orders of magnitude are compared and analyzed,and the dynamic response results after large axial tension are compared.This study concludes that the change in the elastic modulus of the polyester mooring changes the result of the vertex tension by generating an axial tension.The smaller the elastic modulus,the larger the forced oscillation motion amplitude of the top point of the mooring line,the more obvious the axial tension phenomenon,and the smaller the force on the top of the polyester mooring.展开更多
文摘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。
基金Supported by the Specialized Research Project for LS17-2 Semi-submersible Production Platform(LSZX-2020-HN-05-0405)the Engineering Development Program of Deepwater Semisubmersible Production Storage and Unloading Platform of China(SSBQ-2020-HN-02-04)。
文摘Owing to the particularity of a polyester fiber material,the polyester mooring undergoes large axial tensile deformation over long-term use.Large axial tensile deformation significantly impacts the dynamic response of the mooring system.In addition,the degrees of large axial tension caused by different elastic moduli are also different,and the force on the mooring line is also different.Therefore,it is of great significance to study the influence of elastic modulus on the dynamic results of the mooring systems under large axial tension.Conventional numerical software fails to consider the axial tension deformation of the mooring.Based on the theory of slender rods,this paper derives the formula for large axial tension using the method of overall coordinates and overall slope coordinates and provides the calculation programs.Considering a polyester mooring system as an example,the calculation program and numerical software are used to calculate and compare the static and dynamic analyses to verify the reliability of the calculation program.To make the force change of the mooring obvious,the elastic moduli of three different orders of magnitude are compared and analyzed,and the dynamic response results after large axial tension are compared.This study concludes that the change in the elastic modulus of the polyester mooring changes the result of the vertex tension by generating an axial tension.The smaller the elastic modulus,the larger the forced oscillation motion amplitude of the top point of the mooring line,the more obvious the axial tension phenomenon,and the smaller the force on the top of the polyester mooring.
