截断系泊系统不同恢复力矩特性对于深水半潜式平台摇摆运动的影响

以工作在1.5km水深的半潜式平台为例,在截断水深模型实验中,设计5套符合水平及垂向回复力、最大单根缆受力特性相似的截断系泊系统,使之具有不同的力矩特性曲线.通过时域耦合计算,比较在这些截断系泊系统下平台的摇荡运动的差异,并与实验结果对比分析.结果表明,水深截断系泊系统的力矩特性是否相似对半潜式平台摇荡运动有一定影响,平台的水平偏移越大时影响越显著.说明在截断系泊系统设计中,保持与全水深系统一致的力矩相似特性的必要性.

Effect of Moment Characteristics of Truncated Mooring System on Roll and Pitch Motions of a Semi-Submersible Platform

Based on a semi-submersible platform operated at a water depth of 1.5 km, five truncated mooring systems were designed for the model test, which have similar horizontal restoring force characteristics, vertical force-horizontal displacement characteristics and top tension-horizontal displacement of single line as the full depth system, but different restoring moment characteristics. The time domain coupling analysis method was applied to obtain and compare the roll and pitch motions using these different truncated mooring systems. The simulation results were compared with model test data. It is concluded that moment characteristics similarity has a significant impact on the roll and pitch motions of a semi-submersible platform. And the impact increases as the horizontal offset of the platform becomes larger. Therefore, keeping similar moment characteristics with the full depth system is essential while designing the truncated mooring system.