STATE-FEEDBACK CONTROL OF THE STRIP STEERING FOR ALUMINUM HOT-ROLLINGMILLS

This paper discusses the influence of the various factors on the strip steering, and the new concept of the parallel mill modulus control. I t has given an outline of a new steering control system, and has shown its effectiveness. The parallel mill modulus control based on the ben ding force difference operation is useful in comparison with the conve ntional control using the roll gap difference operation, because the v alue of the parallel mill modulus, which depends on the rolling condit ions, is not needed. A new steering control system, based on the state feedback using both bending force difference and roll gap difference, has been developed to compensate for the time delay of the actuators and to stabilize steering. By analytically deriving the controller par ameters from the plant parameters, tuning of the control system is mad e easy. The effectiveness of the new system has been shown by applicat ion in an actual plant. Copyright (C) 1997 Elsevier Science Ltd.