升力反馈减摇鳍防失速控制方法研究

Study on Control Method of Fin Stabilizer with Lift Feedback to Prevent Stall

为了克服常规浪级调节单元的不足,进一步提高减摇鳍的减摇效果,并预防高海况下的动态失速,针对升力反馈减摇鳍系统,采用基于T-S模型的广义预测控制器中带遗忘因子的最小二乘法在线辨识船舶横摇运动方程,以适应变化的海况和船舶横摇参数,减小了计算量,提高了船舶横摇参数变化时减摇鳍的减摇效果。在分析了升力反馈减摇鳍在高海况下失速发生原因和浪级调节单元不足的基础上,通过在预测控制器中引入约束条件解决了高海况下的动态失速。相对于浪级调节单元,广义预测控制器提高了高海况下减摇鳍的利用效率。仿真结果表明,该方法可以在高海况下充分发挥减摇鳍系统的效能,提高减摇效果,并有效防止动态失速的发生。

A generalized predictive controller based on T-S model was employed to improve the effectiveness of fin stabilizer, avoid the dynamic stall of fin and overcome the shortcoming of wave compensation unit by identifying the roll equation of motion by least＇ square method with forgetting factor to adapt the change of sea condition and ship roll parameters. And it can reduce the amount of calculation and improve effectiveness while parametric variation. Based on reason analysis of dynamic stall at high sea state and shortcoming of wave compensation unit, constrained conditions were introduced to predictive controller, ant it can improve the utilization efficiency of fin stabilizer at high state of sea. The simulation, result on ship shows the proposed control strategy can full utilize the efficiency of fin stabi- lizer and get better stabilization effectiveness in high sea state, and dynamic stall is avoided.