H_∞ filter and load observer based complex compensative control for vibration suppression in the 2-mass motor drive system of a rolling mill

A vibration suppressing approach for the rolling mill drive system was put forward, which adopt the complex compensative control based on H_∞ filter and load observer, on the analysis of a two-mass electrometrical model with two-loop drive and engineering practice. Besides the conventional load observer loop, a pseudo roller speed loop was added by means of the roll speed observer value from H_∞ filter constructed by soling the EVP problem of LMI. Compared with the conventional state observer and load observer method, the proposed method loosed the suppose condition of the conventional observer method, and combine the compensations from the load observer and state observer to accomplish integrated vibration attenuation of the motor and roller. Simulation proved that the method achieved better vibration attenuation effect on both the motor and roller than the traditional load observer method.