Abstract: The structure of the strip mill is complicated, and its control system becomes more and more precise and intellective. But the PID control strategy, being comprehensively used in the locale, is difficult to satisfy the request of improving the control precision of the strip mill, because the robust is not very well. So the generalized dynamic matrix control was applied to de-sign the predictive controllers in position servo system of strip mill, and strategy of the receding-horizon optimization, and the feedback correction were adopted. The state observer was con-structed, which made the control system have the state feedback form with the observer, and strengthened the robust of the sys-tem by correcting the predictive model. The control algorithm has the strong stability and the robust, based on the system step response. At the same time, the realization strategy of the com-puter control was provided. The method is easy to be realized and has intelligent capability. The simulation result indicates that the control effect using the presented method is better than that using the traditional PID control which is comprehensively used in the strip production.

Key words: Generalized dynamic matrix control, Position servo system, State observer, Strip mill