月池共振对超深水钻井船运动性能的影响

为了研究月池内流体共振对船体运动的影响,以一艘超深水钻井船为研究对象,采用三维势流理论计算钻井船月池内自由液面和船体的运动,通过月池内自由液面的运动信息,得到月池各种模态下的共振频率,并以此来检验相关理论和经验公式对月池共振频率预报的准确性。月池底部打开和关闭2种状态下钻井船的运动特性显示,月池的活塞共振运动会显著增加船体的垂荡运动,而月池的晃荡共振运动对船体运动的影响较小。

Study on the Effect of Moon Pool Resonance on the Motion of a Ultra-deepwater Drillship

In order to study the effect of fluid resonance in a moon pool on the motion of the ship, taking an ultra-deepwater drillship as the object of study, the three-dimensional potential flow theory is used to calculate and analyze the motion of free surface in the moon pool and the ship body. The value of various modes of resonance frequencies can be obtained through the information of the free surface motion in the moon pool, which also can be used to test the accuracy of the theoretical and empirical formula about the moon pool natural frequency. The motion characteristics of a drillship with a moon pool and without a moon pool are analyzed and compared. The calculation results show that the piston resonance motion in the moon pool can increase the heave motion of the ship body and that the sloshing resonance motion has much less influence on the ship motion.