Shape Control Systems for Sendzimir Cold-rolling Steel Mills with Actuator Saturation

This paper deals with the shape control methodology for Sendzimir cold-rolling steel mills. Due to the several problems which come from the Sendzimir mills' complicate structure, designing automatic shape control system for these mills was one of the main control issues in cold rolling industries. The multi-variable problem and model uncertainty were regarded as main cause which make designing shape control difficult, but we found the actuator saturation problem is also severe. Since most conventional controllers for Sendzimir mill shape control systems do not have the consideration of actuator saturation problem, manual control by operators is still needed in the steel industries. The paper compares some typical shape controllers with various perspectives, and shows how much the actuator saturation affects the shape control performance. At the end of the paper, we'll choose one most effective controller which can handle the actuator saturation problem and demonstrate the shape control result by simulation.