中文摘要：

船舶航行过程中，风力的干扰影响会致使船舶偏离计划航线，浪费能源，甚至对船舶造成危害。为改善船舶航向保持和航向跟踪的性能，可以对风力强度进行前馈控制；但是，至今对风力与等效舵角之间较准确的数量关系一直缺少了解。论文以三自由度船舶平面运动数学模型为基础，分析了在风干扰下的船舶运行状态，得出了风力等效舵角的机理型计算公式。通过对仿真实验结果的分析可知，将状态反馈控制与利用风力等效舵角的前馈控制相结合，组成的航向复合控制是可行的。

英文摘要：

Wind disturbance can make a ship deviate from the set course which wastes energy and imperils the safety of navigation. In order to improve the performance of course keeping for ships, the feed-forward control for wind force can be used, but the relationship between the wind force and its equivalent rudder angle is lack of understanding at present. In this note, on the basis of a mathematical model of 3 DOF ship motions, a theoretic formula of equivalent rudder angle to wind force is deduced after analyzing ship navigating states under wind disturbance. The analysis of the results of simulation experiments proves that it is feasible to control the course by using the feed-forward control of wind force equivalent rudder angle combined with state feedback control.