新型多筒式FDPSO概念设计及其系泊系统分析

为研究新型多筒式浮式钻井生产储卸油轮（FDPSO）的系泊系统及其动力响应特性，评估其系泊系统的疲劳性能，针对新型FDPSO的总体布置，以中国南海1 000 m水深为背景，设计新型储油装置的系泊系统，研究系泊点和导缆孔、系泊缆布置及系缆的结构形式。考虑腐蚀和南海风浪条件，计算系泊系统的动态响应，校核系泊系统的强度，计算系泊状态FDPSO的运动响应和系缆张力。考虑南海西沙波浪分布，采用S-N曲线以及Miner线性累计损伤理论，并采用雨流计数方法，对系泊系统进行疲劳分析。结果表明，设计的多筒式FDPSO的系泊系统能够满足作业定位的要求，可以抵御百年一遇的风浪作用，疲劳寿命大于设计寿命的3倍。

Concept Design and Analysis of the Mooring System for the New Type of Multi-Tubular FDPSO

In this paper, the mooring system and the dynamic response characteristics for the new type multi-tubular Floating, Drilling, Production, Storage and Offloading vessel （FDPSO） are studied, and the fatigue properties of the mooring system are particularly evaluated. Based on the general arrangement of the new type FDPSO, a novel mooring system is proposed correspondingly, and its structure of mooring points, fairleads, and mooring lines is designed against the 1 000 m water depth condition of South China Sea. By considering the corrosion factor and the wave condition, the dynamic response of the mooring system is calculated, the strength of the system is verified, and the motion response and cable tension of the overall mooring FDPSO are obtained. Finally, based on the specific wave distribution in Xisha, South China Sea, the fatigue analysis is implemented using the S-N curve, Miner＇s linear cumulative damage theory, and the rain-flow counting method. The results show that the presented mooring system satisfies the demand of routine operations and positioning, and it is capable of withstanding extreme storms as its fatigue life is 3 times longer than its projected lifetime.