Abstract
At the Mizushima Works of Kawasaki Steel Corp. a new control algorithm applying modern control theory has been developed to improve accuracy of strip width and gauge at the hot strip finishing mill. From the control aspect, hot strip mill is a highly representative multi-variable process, including complicated rolling phenomena and numerous rolling control loops. The new algorithm consists of optimum regulator and feedforward control to control observed disturbances. First, nonlinear equations are derived, describing total rolling phenomena from rolling theory, thermal phenomena, and control equipment, then linearized to obtain linear state space equations for the 7 stand finisher. Many physical considerations are incorporated in order to decouple variables after ISM method analysis of their mutual relations. From simulation results of these linear state space equations, good results were expected, even simplifying a system using some assumption and approximation.
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