Optimal Servo Control for Coil Tension of the Coiler System in Hot Rolling Mill

This paper designs an optimal servo controller for the coiler system in hot rolling mill in order to suppress the tension fluctuation of the tail-end part after a steel plate leaves the final stand of hot rolling mill. The state space model of the coiler system is firstly modeled. Next, the optimal servo controller combined with a disturbance observer is designed using the inverse LQ optimal control method and the full state observer algorithm. Finally, it is shown by a computer simulation that the proposed control system is very effective to control tension fluctuations between the pinch roll and the mandrel under disturbances.