船舶大舵角转向时艏摇与横摇的耦合仿真研究

Study on the Yaw-Roll Coupling Simulation of Vessel Course Changing under Large Rudder Deflection

为进一步研究船舶在大幅度转向时艏摇和横摇的耦合机制,在非线性船舶运动数学模型的基础上,进行了不同情形下的操纵仿真试验。试验结果显示在大舵角转向时,船舶的艏摇和横摇运动存在较强的耦合作用,横摇幅度和艏摇幅度存在正相关性。指出大幅度的横摇使艏摇出现相位滞后和偏离基准航向的现象;在横摇过大的情况下,大幅度动舵和加速操纵将导致稳性迅速消失和航向打横。

In order to further study the yaw-roll coupling mechanism of large degree vessel course changing, the maneuvering simulation tests under various conditions are performed based on the nonlinear ship motion mathematical model. The results show that during large rudder deflection course changing, the yaw and the roll motions of the ship have strong coupling effects, the roll amplitude has positive correlation with the yaw amplitude. Therefore, it is pointed out that large amplitude roll motion will cause the phenomenon of yaw motion phase lag and deviation from the reference heading; in the case of excessive roll motion, large amplitude rudder deflection and maneuvering acceleration will lead to the swift loss of stability and broaching.