较大周期波浪作用下大型系泊(LNG)船舶运动响应试验研究(英文)

Experimental Study of the Motion Responses of a Large Mooring (LNG) Ship in the Waves with Grand Period

采用物理模型试验方法,对横向较大周期波浪作用下一艘大型系泊(LNG)船舶运动响应特性进行了研究。结果表明:系泊船舶纵移、横移和回转运动存在着自振周期;横移运动为周期性运动,横移自振周期与船舶横摇固有周期比值在1.11～1.23间,且横移运动峰值随着波浪周期的增大而增大;不同装载状态下,升沉运动随波浪周期增大的变化规律一致,升沉运动量最大值大于波高;横向波浪作用下,系泊船舶纵摇运动受波浪周期变化影响很小;横摇运动为周期性运动,横摇自振周期与船舶固有横摇周期的比值在1.23～1.48间,横摇运动峰值随波浪周期增大而增大。

An experiment was performed on a large mooring LNG （Liquid Natural Gas） ship to study its characteristics of motion responses in transverse waves with grand period of 10-50 s. The results indicate that the mooring ship＇s movements of surge, sway and yaw have their own natural periods, the sway of the mooring ship has periodic movement. The ratio of the natural period of sway and the nat- ural rolling period of the mooring ship is within 1.11~1.23. The peak value of sway grows along with the increase of the wave period, along with the periodic changes of waves, the regularities of the LNG ship＇s movement of heave are basically the same under different loading conditions. The peak value of heave is greater than the wave height, under the effects of transverse waves, the ship＇ s movement of pitch is affected little by the changes of wave period, the movement of roll is a kind of periodic change. The ratio of the natural periods of roll and the natural rolling period of the mooring ship is within 1.23-1.48. The peak value of roll grows along with the increase of wave period.