The dynamic performance of a work ship with a mooring line failure was studied. A fully coupled dynamic analysis program (Ansys Aqwa) was applied to simulate ship motions and mooring line dynamics. The first- and second-order wave excitation forces were calculated using the three-dimensional diffraction/radiation theory, and the behaviours of the mooring lines were analysed using a non-linear finite-element method. Under the combined environmental loads of waves and wind, one mooring line was intentionally disconnected at a certain moment. Then, the dynamic response after the mooring line breaks, the energy distribution characteristics in the motion response spectrum and the mean tension variation of the remaining mooring lines were assessed. The results showed that sudden failure of the mooring line significantly affected the performance of the ship. Therefore, to ensure the structural integrity of the ship system and the safety of personnel on deck, the influence of a mooring line failure on a ship should be investigated in advance.

中文翻译：

---

一条系泊线故障对工作船行为的影响

研究了系泊线故障作业船的动力性能。应用全耦合动态分析程序 (Ansys Aqwa) 来模拟船舶运动和系泊线动力学。使用三维衍射/辐射理论计算一阶和二阶波激发力，并使用非线性有限元方法分析系泊线的行为。在海浪和风的综合环境载荷下，某一时刻有意断开了一条系泊线。然后，评估了系泊索断裂后的动力响应、运动响应谱中的能量分布特征和剩余系泊索的平均张力变化。结果表明，系泊缆突然失效严重影响了船舶的性能。因此，为确保船舶系统的结构完整性和甲板人员的安全，应提前调查系泊缆故障对船舶的影响。