锚泊线一阶运动响应对二阶锚链阻尼的影响(英文)

First-Order Response Effect on Second-OrderDamping of Mooring Line? ?

本文主要研究锚泊线的一阶运动响应对二阶锚链阻尼的影响。在频域内采用摄动方法分析系泊结构物慢漂运动时 ,锚链二阶方程可分解成非齐次方程和齐次方程。其解分别与锚链的一阶运动响应和浮式结构物的二阶运动有关。为了探讨锚泊线一阶运动的影响 ,本文通过求解非齐次和齐次方程 ,分别求得相应的二阶锚链阻尼和二阶锚链力。从计算结果可以看出 ,尽管由非齐次方程得到的二阶锚链力占总的二阶锚链力成分很小 ,但其所提供的二阶锚链阻尼却与二阶齐次方程解同量级。故在分析二阶锚链阻尼时 。

In this paper we investigated the effect of first-order responses of mooring line on the second-order mooring line damping. In the analysis of the slow oscillation of a moored floating structure by the perturbation method in frequency domain,the second-order equations of mooring line are divided into non-homogeneous and homogeneous equations.The solutions are related to first-order responses of mooring line and second-order floating structure oscillation,respectively. In order to find the effect of first-order responses of mooring line,the second order mooring line tension and damping were determined by solving the non-homogeneous and homogeneous equations.From the results,it can be found that,although the second-order tension of mooring line obtained from the non-homogeneous equation is quite small compared with the total second-order mooring line tension,the damping contributed from both of the them are in the same order in quantity. So, in predicting the second-order mooring line damping, the effect of thesolution related to the non-homogeneous equation can not be neglected.