2-Inertia System Control using Resonance Ratio Control and Manabe Polynomials

Abstract

Vibration suppression and disturbance rejection controls are important issues in recent steel rolling mill systems due to the application of high response Ac drive system. Various methods have been already proposed, for example, simple acceleration feedback, state feedback and H∞ control, etc.
In this paper, I will propose a novel controller for a 2-inertia system which is the simplest model of the rolling mill system, where the roll is coupled with the motor by a long shaft. By realizing “Manabe Polynomials” using the “resonance ratio control” based on the disturbance observer, the 2-inertia system can be controlled quite effectively. Moreover, the order of the proposed controller is only 2.
I will show some simulation results to demonstrate that the proposed controller suppresses the torsional vibration and the disturbance torque effectively in various 2-inertia systems with a wide range of the ratio between the motor and load inertia moments.