波浪作用下串联浮筒对船型网箱锚泊系统的受力影响分析

Analysis of the influence of increasing buoys on the anchoring system of ship-type cage under wave

船型网箱是一种新型抗风浪深水网箱,其采用船形结构以及单点系泊方式,合理的锚泊系统设计是保证船型网箱安全可靠的关键.依据Stokes二阶波浪理论和Morison方法,采用数值方法分析了锚泊系统串联浮筒对船型网箱水动力特性的影响以及不同波况作用下浮筒位置、大小对锚绳力的影响,并进行了物理模型实验验证.结果表明,船型网箱最大锚绳力随着波高的增大而增大,随周期变化不明显;串联浮筒增加了浮架纵向位移,使得浮架相对水质点速度减小,从而减小了浮架所受最大波流力以及锚绳力;最大锚绳力随着浮筒直径增加先减小后增大,随着浮筒位置远离浮架连接点而减小.

The ship-type cage is a new type of wind-resistant offshore cage.This cage uses a boat-shaped structure and a single-point mooring method that can be rotated downstream around the anchor point.Reasonable mooring system design is the key to ensure the safety and reliability of ship-type cages.According to Stokes second-order wave theory and Morison method,the effects of increasing the buoy on the hydrodynamic characteristics of the ship-type cage,as well as the effects of buoy position and size on anchor rope forces under different wave conditions are analyzed by numerical method.Physical model experiments were performed to verify the results.The results show that the maximum anchor rope force of the ship-type cage increases with the increase of the wave height,and has no obvious change with the period.Connecting the buoy increases the longitudinal displacement of the floating frame,thereby reducing the maximum wave current force on the floating frame and the force on the anchor rope.The maximum anchor rope force decreases first and then increases as the diameter of the buoy increases,and decreases as the buoy moves away from the connection point of the buoy.