系泊油轮与海上平台的碰撞力分析

考虑风、浪、流的联合作用以及平台护舷非线性恢复刚度,研究船舶系泊状态与平台的撞击力及其分布规律。针对不同的风、浪、流的作用方向以及不同的风速、波高及流速,计算波浪和海流的载荷,建立系泊船舶的分析模型,采用频域与时域分析方法,进行系泊船舶运动及其与平台之间碰撞力的仿真,得到系泊船舶与平台的碰撞力时间历程,并分析不同碰撞力发生的概率,确定发生最大碰撞力的风、浪、流方向,比较常量护舷刚度与非线性护舷刚度的计算结果。结果表明,橡胶护舷刚度的选取对于碰撞力的计算结果影响显著,选取非线性护舷刚度计算靠泊碰撞力十分必要,用目前的经验公式计算得到的碰撞力偏差较大。

Collision Force Between Moored Tanker and Offshore Platform

Collision force and its distribution which acted on the rubber fender of a ship moored to a platform were researched by considering the influence of wind, wave, flow and nonlinear stiffness of the plat- form fender. According to different angles of wind, wave and flow as well as different wind speed, wave height and flow velocity, the loads of wave and ocean current for mooring system were calculated. And also the analysis model for moored ship was established. Moreover the collision force between the moored ship and a platform were simulated through the method of time domain and frequency domain, and obtained the time history of collision force. Besides, the probability of occurrence of different collision force was ana- lyzed in order to determine the direction of wind, wave and flow which maximum collision force occurred. The results show that the rubber fender stiffness has significant effect on the calculation of collision force, it is essential to choice non-linear fender stiffness when calculating the collision force on the platform. And there are relatively larger deviations by using empirical formula to calculate collision force.