Application of decoupling hybrid control for cold rolling mill with disturbance observer

In this paper, a decoupled hybrid control of velocity and tension is applied to cold rolling system with a disturbance observer in simulation. This innovative method controls the strip tension and line speed independently in orthogonally-crossed two modal spaces: the differential mode and the common mode. In the proposed system, even if the operator changes the line speed, the target tension is maintained at constant value. As a result, the product quality and stability of the cold rolling process are improved.