冷带轧机厚控系统自适应鲁棒输出反馈动态控制器设计

冷带轧机厚控系统可被认为是一个受外界干扰的线性不确定时滞系统.本文首先设计了标称系统下的鲁棒输出反馈动态控制器,以改善闭环系统的动静态性能;其次,在系统不需要满足不确定性匹配条件的情况下,将参数和外部扰动不确定性综合考虑.应用Lyapunov稳定性理论设计了系统不确定性上界参数的自适应估计器和系统的自适应控制器,保证了闭环系统的渐近稳定性,减小了设计的保守性;两者结合实现了板带出口厚度的有效控制.最后通过一个仿真实例说明本文所提出的自适应鲁棒控制器的有效性.

Design of adaptive robust output feedback dynamic controller for thickness control in a cold strip rolling mill

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.