系泊船舶运动响应周期试验研究

针对国内外系泊船舶物理模型试验中所给系泊船舶运动响应周期特征参数的不同,对横向波浪作用下一艘26.6×104 m3系泊LNG船舶的运动响应周期特性进行物理模型试验研究。结果表明,半载状态下,纵移运动存在着32 s的自振周期;横移运动为周期性间歇增长运动,横移运动周期与系泊船舶固有横摇周期的比值在1.11～1.23,大体上随波浪周期增大成倍数增长;横摇运动峰值随波浪周期增大而增大,横摇运动周期与系泊船舶固有横摇周期的比值在1.23～1.48,大体上随波浪周期增大成倍数增长;不同装载状态下回转运动均存在着较长的自振周期:半载状态为30 s,满载状态为32 s。

Experimental study on periods of mooring ship's motion responses

In respect of the difference between domestic and foreign physical model tests in characteristic parameters of a mooring ship’s motion response periods,experiments are performed on a 266 000 m3 LNG ship under the function of transverse waves to study the characteristics of the ship’s motion response periods.The results show that a natural period to the ship’s surge motion is 32 s under the ballasted condition;the sway motion is a kind of intermittent periodic growth movement,the ratios of the periods of sway motion and the natural periods of the ship’s roll are between 1.11 and 1.23,which,in general,grow exponentially with the increase of wave periods.The peak values of rolling motion grow with the increase of wave periods.The ratios of rolling motion periods and the mooring ship’s natural rolling periods are between 1.23 and 1.48,which roughly grow exponentially with the increase of wave periods;the natural periods of yaw motions become longer under different loading conditions: 30 s for the ballasted condition,and 32 s for the laden condition.