On Optimal Estimation Speed of Disturbance Observer used in the Slow Resonance Ratio Control.

Abstract

In the resonance ratio control, which is a well-known excellent technique for vibration suppression and disturbance rejection control of torsional systems, the estimation speed of the disturbance observer was assumed to be much faster than the resonance frequency of the controlled object. However, too fast disturbance observer sometimes causes implementation problem. In this paper, we give the optimal speed of the disturbance estimation and propose a novel technique, “slow resonance ratio control”. It enables us to design the speed controller and the vibration suppression controller completely independently.