中文摘要：

为了满足深水浮式结构物系统设计中准确预报浮体耦合运动及外载荷的要求,基于三维势流理论和细长杆理论,分别采用间接时域耦合动力方法和物面非线性时域耦合动力方法对深水浮式结构物系统进行了数值计算。前者采用摄动展开方法在平均湿表面计算系泊浮体的一阶和二阶水动力,后者采用时域格林函数方法在瞬态位置直接时域模拟系泊浮体所需非线性水动力。结合有限元方法计算系泊缆索动力响应,利用异步耦合方法实现浮体和系泊缆索的时域耦合动力求解。研究结果表明,低海况下,两种时域耦合动力方法结果差别不大。高海况下,平台瞬态空间位置对垂荡低频运动影响较大,有必要在平台瞬时湿表面采用动力响应方法进行深水浮式结构物系统时域耦合响应分析。

英文摘要：

This paper presents the indirect dynamic coupling method in time domain and the nonlinear dynamic coupling method in time domain for numerical simulation of deepwater floating structures. The perturbation expansion is adopted to evaluate the first order and second order of hydrodynamic force on the mean wetted surface for the former method, while the Green function is applied to simulate the transient position for the latter method. A finite element model is employed to evaluate dynamic responses of mooring lines. The results show that the difference between two methods is little in better sea conditions. However, the transient position of platform has a great influence on heave motion in rough sea conditions.