Robust steering control of hot strip mill

Ivan Malloci (1) , Jamal Daafouz (1) , Claude Iung (1) , Rémi Bonidal (2) , Patrick Szczepanski (2)

1 CRAN - Centre de Recherche en Automatique de Nancy
2 ArcelorMittal

In this article, a robust hot strip mill steering control is proposed in order to guarantee the system stability and to improve its performances. The rolling process consists in crushing a metal strip between some rolls for obtaining a product with constant and desired thickness. The quality of the rolled products and the safety of the production process are linked to the lateral movement of the strip in the line. Then, the main task of the steering control consists in reducing this displacement. A hot strip mill treats products with very different characteristics. Then, the products are divided into several families, with reference to their physical characteristics, and the stabilisation problem is formulated as a convex problem. Finally, for each family, a different robust controller is designed. Simulated and experimental results concerning the steering control in the ArcelorMittal hot strip mill of Eisenhuttenstadt are presented.

Mots clés: Hot strip mill; Steering control; Singular perturbation; Polytopic uncertainties; H2 robust control design

Domaines: Automatique

Ivan Malloci, Jamal Daafouz, Claude Iung, Rémi Bonidal, Patrick Szczepanski. Robust steering control of hot strip mill. 10th European Control Conference, ECC'09, Aug 2009, Budapest, Hungary. pp.CDROM. ⟨hal-00417791⟩