Tension control for winding systems with two degrees of freedom H/sub /spl infin// controller

The plant considered in this paper is a web system with winder, traction motor and unwinder. Transport system dynamics change dramatically due to the wide variation in roll radii and inertia. The effect of these changes is reduced by gain scheduling control. Industrial systems typically use decentralized PID controllers. In this paper, the authors present multivariable H/sub /spl infin// robust control with two degrees of freedom and gain scheduling. This controller significantly improves disturbance rejection performance and significantly reduces coupling between web tension and velocity. Performances of this controller and classical H/sub /spl infin// controllers are compared.