Roll eccentricity compensation control for strip rolling mills based on wavelet packet de-noising theory

This study seeks to improve the strip thickness accuracy by adding filter and compensator in strip rolling mills. Based on wavelet packet de-noising theory, this paper designed a wavelet packet analyzer of roll eccentricity (WPARE) to eliminate noises and useless frequencies in rolling force signal. By combining WPARE with a compensator, the rolling force influenced by the workpiece in a rolling process could be examined, and it can be fed back by the hybrid system in time. Meanwhile, the rolling gap with compensation eccentricity was quantitatively deduced. Results from a simulation illustrate that the new method could restrain the influence of eccentricity effectively and improve the thickness precision.