Switched system modeling and robust steering control of the tail end phase in a hot strip mill

In this article, a robust steering control for the last phase of the rolling process in a hot strip mill is proposed. This phase, called tail end phase, may be modelled as a linear switched system. The switchings make the system unstable and the task of the tail end steering control consists in guaranteeing the safety of the industrial plant. The control law has to take into account the physical variations of the rolled products and an uncertainty in the switching time. Simulation results concerning the ArcelorMittal hot strip mill of Eisenhüttenstadt are presented.