顶推船队风浪中操纵特性

Maneuvering characteristic in wind and wave for the push boat train

采用4自由度"组合型"操纵运动数学模型,预报顶推船队风浪中操纵特性。由计算结果表明,顶推船队风浪中操舵沿与原航向成α角方向作回转漂移运动,风浪中回转,不仅存在横倾,而且以该横倾为基准叠加有横摇运动。从综合分析可知,顶推船队在相应工况下风浪中回转、初始回转及纠向和保持航向能力随波高ζa、风速船速比Ua/Uo、及船队长度Lc增大而下降,操舵角为影响风浪中回转能力的主因,随操舵角减小,其回转能力急剧下降。

The prediction on manoeuvrability in wind and wave was carried out with a four DOF mathematical model describing the maneuvering motion for the push boat train.The calculating results show that turning tract to take the helm in wind and wave is excursion tract alongα angle with original course,and turning in wind and wave,not only there is roll angle,but also there is rolling motion added based on the roll angle for push boat train.From synthesis analysis,the turning ability,initial turning ability,yaw-checking and course-keeping ability are descended with the increase of wave heigh ζa,Ua/Uo ratio of wind speed to ship speed,and length of the push boat train,and angle to take the helm is a central factor influencing the turning ability in wind and wave,the turning ability is descended with the decrease of rudder angle.