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
Mooring system plays an important role in station keeping of floating offshore structures. Coupled analysis on mooring-buoy interactions has been increasingly studied in recent years. At present, chains and wire ropes...Mooring system plays an important role in station keeping of floating offshore structures. Coupled analysis on mooring-buoy interactions has been increasingly studied in recent years. At present, chains and wire ropes are widely used in offshore engineering practice. On the basis of mooring line statics, an explicit formulation of single mooring chain/wire rope stiffness coefficients and mooring stiffness matrix of the mooring system were derived in this article, taking into account the horizontal restoring force, vertical restoring force and their coupling terms. The nonlinearity of mooring stiffness was analyzed, and the influences of various parameters, such as material, displacement, pre-tension and water depth, were investigated. Finally some application cases of the mooring stiffness in hydrodynamic calculation were presented. Data shows that this kind of stiffness can reckon in linear and nonlinear forces of mooring system. Also, the stiffness can be used in hydrodynamic analysis to get the eieenfrequencv of slow drift motions.展开更多
This paper focuses on the research of a semi-submersible platform equipped with a DP-assisted mooring system. Based on the working principles of the DP-assisted mooring system and the model of the platform motion, a t...This paper focuses on the research of a semi-submersible platform equipped with a DP-assisted mooring system. Based on the working principles of the DP-assisted mooring system and the model of the platform motion, a time domain simulation program is applied to analyze the impact, in the case of one line failure, on the platform motion, power consumption of the thrusters and the tension of the mooring lines. The results show that, under the 10-year wind dominant, a one line failure will have little impact on the tension of the mooring lines. When the failure line is windward, the power consumption will increase greatly with a weakened position of accuracy. However when the failure line is leeward, the power consumption will be reduced with a partly strengthened oosition of accuracy.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 National Natural Science Foundation of China under Grant No.（51079034）.
文摘Mooring system plays an important role in station keeping of floating offshore structures. Coupled analysis on mooring-buoy interactions has been increasingly studied in recent years. At present, chains and wire ropes are widely used in offshore engineering practice. On the basis of mooring line statics, an explicit formulation of single mooring chain/wire rope stiffness coefficients and mooring stiffness matrix of the mooring system were derived in this article, taking into account the horizontal restoring force, vertical restoring force and their coupling terms. The nonlinearity of mooring stiffness was analyzed, and the influences of various parameters, such as material, displacement, pre-tension and water depth, were investigated. Finally some application cases of the mooring stiffness in hydrodynamic calculation were presented. Data shows that this kind of stiffness can reckon in linear and nonlinear forces of mooring system. Also, the stiffness can be used in hydrodynamic analysis to get the eieenfrequencv of slow drift motions.
基金Suppirted by the Programme of Introducing Talents of Discipline to Universities(B07019)
文摘This paper focuses on the research of a semi-submersible platform equipped with a DP-assisted mooring system. Based on the working principles of the DP-assisted mooring system and the model of the platform motion, a time domain simulation program is applied to analyze the impact, in the case of one line failure, on the platform motion, power consumption of the thrusters and the tension of the mooring lines. The results show that, under the 10-year wind dominant, a one line failure will have little impact on the tension of the mooring lines. When the failure line is windward, the power consumption will increase greatly with a weakened position of accuracy. However when the failure line is leeward, the power consumption will be reduced with a partly strengthened oosition of accuracy.
