锚泊浮船坞的水动力性能

提出了一种浮船坞锚泊系统响应分析的数值计算模型，运动方程在时域内求解．三维混合积分方程法用于计算浮船坞在频域内的水动力系数和波浪扰动力，并消除了不规则频率的影响．假想作用力法用于模拟锚泊线的作用，考虑了锚泊线的弹性和流力作用．计算和实验证明，在锚链中设置块重能减小浮船坞的最大运动幅值及锚链张力峰值．由于波频运动的影响，交叉锚泊系统其锚链所受的张力幅值比开式锚泊系统大，从而使得交叉锚泊系统锚链的疲劳寿命比开式系统短．

HYDRODYNAMIC BEHAVIOUR OF A MOORED FLOATING DOCK

This paper describes a numerical model for designing mooring system of a floating dock in shallow waters. Motion equations of the moored floating dock are solved numerically in time domain. The combined integral equation method is used to remove irregular frequencies from the results in the computations of hydrodynamics. The mooring line is analyzed by using what is called imaginary reaction process, in which the elongation of the mooring line and hydrodynamic forces acting on it are taken into consideration. Results of the calculation and the model test show that the method proposed to reduce peak mooring forces is successful. Due to the influence of wave frequency motions, greater tension forces occur in cross moorings with large amplitude than in open moorings, so that the fatigue life of the chains in the cross moorings is much less as compared with open moorings.