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Experimental study on taut and hybrid moorings damping and their relation with system dynamics

机译：张拉和混合系泊阻尼的实验研究及其与系统动力学的关系。

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A de-coupled technique is applied to the analysis of mooring damping of taut mooring systems and two types of hybrid mooring systems. The effects of mooring damping on low frequency motion responses as well as mooring tensions are also investigated. Besides, the effects of mooring pretensions on floating systems dynamics are discussed. Irregular wave model tests were carried out in beam and heading seas to simulate a semi-submersible operating in 200 m water depth in typical South China Sea wave conditions. First the characteristics of mooring line models were checked to determine if they satisfy model test requirements. Free decay model tests and numerical simulations are carried out to obtain the critical damping of different systems. The 6 DOF motion responses obtained from model tests are input to solve mooring dynamics with de-coupled method and the accuracy of the numerical methods is validated. Mooring tensions as well as mooring motions at fairleads in horizontal directions are obtained to study mooring damping. The damping of all mooring systems in real sea states are then obtained and compared, the relation between mooring damping with horizontal motion responses are studied.
机译：一种解耦技术被应用于张紧系泊系统和两种混合系泊系统的系泊阻尼分析。还研究了系泊阻尼对低频运动响应以及系泊张力的影响。此外，还讨论了系泊预应力对浮动系统动力学的影响。在海浪和航向海中进行了不规则波浪模型测试，以模拟典型的南海波浪条件下在200 m水深中运行的半潜式潜水器。首先，检查系泊缆线模型的特性，以确定它们是否满足模型测试要求。进行自由衰减模型测试和数值模拟以获得不同系统的临界阻尼。输入从模型测试获得的6个自由度运动响应，以解耦方法解决系泊动力学问题，并验证了数值方法的准确性。为了研究系泊阻尼，获得了缆索在水平方向上的系泊张力和系泊运动。然后获得并比较了在真实海况下所有系泊系统的阻尼，研究了系泊阻尼与水平运动响应之间的关系。

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