Design of adaptive robust output feedback dynamic controller for thickness control in a cold strip rolling mill
冷带轧机厚控系统自适应鲁棒输出反馈动态控制器设计

The thickness control system of cold strip rolling mill can be considered a linear uncertainty time-delay system with external disturbance.Firstly,robust output feedback dynamic controller for nominal system is designed to improve the dynamic and static performance of closed-loop system.The uncertainty matching condition is not necessary, and the parameter adaptive estimator law for uncertainty upper bound and adaptive controller are then designed on the basis of Lyapunov stability theory by taking parameter and disturbance uncertainty into account together.So the asymptotic stability of closed-loop system is guaranteed,and design conservation is reduced.Effective thickness control is also fulfilled for the exit strip by the robust output feedback dynamic controller and the adaptive controller.Finally,a simulation example is given to illustrate the efficacy of the proposed adaptive robust controller.