To decrease the complexity of experimental setup that often results in low reliability of the experimental results for typical offshore floating structures with increasingly excessive mooring lines, a mooring line number simplification methodology is proposed based on equivalent of the vessel/mooring coupled dynamics for vessel with original and simplified mooring systems. The Non-dominated Sorting Genetic Algorithms-II (NSGA-II) is adopted to achieve the static restoring forces equivalent, where the line length, axial stiffness and submerged mass of the simplified mooring system are obtained. The line diameter is then determined based on dynamic restoring forces equivalent when the mooring system is exerted by forced oscillations. Using correlation coefficients, the vessel/mooring coupled dynamics of vessel with original and simplified mooring systems are compared to determine the optimal simplified mooring system. The feasibility of the proposed methodology is demonstrated by an application for a VLFS’s mooring system comprising 20 mooring lines. Two simplified mooring systems are obtained with the correlation coefficients of coupled vessel/mooring dynamics lager than 0.97. It can be concluded that the proposed method can be used as a useful tool to guide mooring line number simplification for model testing.

中文翻译：

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基于船舶/系泊耦合动力学等效模型测试的系泊线编号的简化

针对具有越来越多的系泊缆绳的典型海上浮式结构经常导致实验结果可靠性低的实验设置复杂性，提出了一种基于等效船舶/系泊耦合动力学的系泊缆数简化方法。和简化的系泊系统。采用非支配排序遗传算法-II（NSGA-II）实现静态恢复力等效，得到简化系泊系统的线长、轴向刚度和水下质量。当系泊系统受到强制振荡时，根据等效的动态恢复力确定绳索直径。使用相关系数，将船舶与原始和简化系泊系统的船舶/系泊耦合动力学进行比较，以确定最佳的简化系泊系统。VLFS 系泊系统包括 20 条系泊绳索的应用证明了所提议方法的可行性。获得了两个简化的系泊系统，其耦合船舶/系泊动力学的相关系数大于 0.97。可以得出结论，所提出的方法可以用作指导模型测试的系泊线编号简化的有用工具。获得了两个简化的系泊系统，其耦合船舶/系泊动力学的相关系数大于 0.97。可以得出结论，所提出的方法可以用作指导模型测试的系泊线编号简化的有用工具。获得了两个简化的系泊系统，其耦合船舶/系泊动力学的相关系数大于 0.97。可以得出结论，所提出的方法可以用作指导模型测试的系泊线编号简化的有用工具。