A moored floating structure may exhibit resonant motion responses to low-frequency excitations. Similar to the resonant responses of many vibration systems, the motion amplitude of a moored floating structure is significantly affected by the damping of the entire system. In such cases, the damping contributed by the mooring lines sometimes accounts for as much as 80% of the total damping. While the damping induced by catenary mooring lines is well-investigated, few studies have been conducted on the damping induced by taut mooring lines, especially one partly embedded in soil. The present study develops a simple but accurate model for estimating the damping contributed by mooring lines. A typical type of taut mooring line was used as the reference and the hydrodynamic drag force and soil resistance were taken into consideration. The proposed model was validated by comparing its predictions with those of a previously developed model and experimental measurements obtained by a physical model. Case studies and sensitivity studies were also conducted using the validated model. The damping induced by the soil resistance was found to be considerably smaller than the hydrodynamic damping. The superposition of the wave frequency motion on the low-frequency motion was also observed to significantly amplify the damping induced by the mooring lines.

系泊的浮动结构可能会表现出对低频激励的共振运动响应。类似于许多振动系统的共振响应，系泊浮动结构的运动幅度会受到整个系统阻尼的显着影响。在这种情况下，系泊缆带来的阻尼有时会占总阻尼的80％。尽管对悬链式系泊缆线引起的阻尼进行了充分的研究，但对绷紧系泊缆线引起的阻尼的研究很少，尤其是部分埋在土壤中的阻尼。本研究开发了一个简单但准确的模型来估算系泊缆所产生的阻尼。以典型的拉紧系泊缆线为参考，并考虑了流体动力阻力和土壤阻力。通过将其预测与先前开发的模型的预测以及由物理模型获得的实验测量值进行比较，验证了所提议的模型。还使用经过验证的模型进行了案例研究和敏感性研究。发现由土壤阻力引起的阻尼明显小于流体动力阻尼。还观察到波浪频率运动在低频运动上的叠加会显着放大由系泊缆引起的阻尼。