复杂系泊系统静力特性快速计算方法研究

以一工作水深为375 m的转塔式浮式生产存储系统(FPSO)为例,研究了复杂系泊系统静力特性计算方法.基本思路是,首先计算出每种类型锚泊线的水平张力TH-水平跨距X曲线,以离散点的形式给出;然后依次给出上端系缆点水平移动距离,相应的计算每根锚泊线新的水平跨距,再根据这些新的水平跨距在对应的TH-X曲线中插值求出此时的每根锚泊线水平张力,将其向X轴正方向投影,合成后即得上端系缆点移动后的系泊系统X方向水平恢复力.对垂直方向的恢复力计算方法与此类似.计算结果与Dynfloat软件结果吻合得很好.此方法简单直观,容易理解,且耗时较少,比较适用于复杂系泊系统静力特性计算.

Investigation on quick computation method of the static characteristics of complex mooring system

In this paper, a turret moored FPSO in water depth of 375 m is selected to investigate the computation method of static characteristics of complex mooring system. The basic idea can be described as follows. Firstly, the curve of horizontal tension TH-horizontal span X of a single mooring line of every type of cable is calculated and the results are expressed in discrete points. Secondly, the horizontal transfer distance of the top point is presented in turn to calculate the corresponding new horizontal span of every mooring line. Thirdly, through numerical interpolation in the corresponding TH-X curve according to the new horizontal span, the horizontal tension of every mooring line can be calculated. Fourthly, to project T, at direction of X and to integrate it as total, the horizontal restoring force on the top point at direction X of the mooring system can be get. The calculation of the vertical restoring force is similar to that mentioned above. The results are compared with those from Dynfloat and the agreement is good. The method presented in this paper is comparatively brief, straight and easy to understand. It will consume comparatively less time. Obviously, it can be concluded that the method in this paper is quite feasible for computation of complex mooring system static characteristics.