深水悬链锚泊系统等效截断水深优化设计

Optimized design of deepwater catenary mooring system in equivalent truncated water depth

工程中,常用的深水悬链锚泊线通常是由顶部锚链、中部钢索和底部锚链三段复合而成。该文采用分段外推的数值解法,考虑锚泊线所受的重力、张力、流力以及锚泊线的弹性伸长,利用黄金分割算法求解锚泊线顶端张力对应的顶张角,对其进行静力特性分析。基于混合模型试验方法应用,考虑锚泊系统静力特性相似,采用遗传算法编制开发等效截断水深系统优化设计程序。以一座工作水深为1 500 m的深水半潜式平台为例,对其悬链式锚泊系统在700 m水深处进行等效截断优化设计计算,为下一步进行混合模型试验提供参考。

Used in deepwater catenary mooring systems, the multi-component mooring lines are usually made up of three wire ropes and chains of different buoyancy unit weight, stiffness and length. Considering the gravity, tension, current force and mooring line extension, the piecewise extrapolating method is employed to the static analysis of the multi-component mooring line and the golden section method is used to find out the top angle of the mooring line. An optimized designing program is developed based on genetic algorithm considering the similarity of static characters for hybrid model test. Taking the catenary mooring system used for some semi-submersible platform of 1 500 m water depths for example, the equivalent truncated mooring system used in 700 m water depths is designed, which can provide references for the following processes in hybrid model test.