Based on Nonlinear Disturbance Observer Approach Non-interactive Control for Hot Rolling Mill: Experimental Validation

This paper proposes an advanced method to reduce fluctuations of strip tension and looper position in a steel rolling mill. We design a non-interactive controller to decouple the looper system into two subsystems. We consider uncertainties, disturbances and interactions as each nominal subsystem's disturbance. To reduce these disturbances, we use a nonlinear disturbance observer. We prove that the proposed method can reduces response time and fluctuations in strip tension in comparison with other methods. Simulation results and hardware experiment results are included.