系泊系统动力分析的时域方法

A Time Domain Computation Method for Dynamic Behavior of Mooring System

采用准定常时间域方法分析了在风、浪、流联合作用下海上系泊系统的运动及动力特性．在每一时间步系泊力由准静态方法得到．得到船舶运动时历后，采用推广的三维集中质量法求得锚链的动力特性．在计算船舶的静水恢复力和Ｆｒｏｕｄｅ－Ｋｒｙｌｏｖ力时，计及了瞬时湿表面变化引起的非线性作用．

A quasi steady time domain method is developed for the prediction of dynamic behavior of a mooring system under the envionmental disturbances, such as regular or irregular waves, winds and currents.The mooring forces are obtained in a static sense at each instant. The dynamic feature of the mooring cables can be obtained by incorporating the extended 3 D lumped mass method with the known ship motion history. Some nonlinear effects, such as the influence of the insattaneous change of the wetted hull surface to the hydrostatic restoring forces and Froude Krylov forces, are included.The computational results show a satisactory agreement with the experimental ones.