Analysis and Simulation for Compensation of the Eccentricity in a Cold Mill

Using the method of Modified Fast Fourier Transform and of least square, the periodical variation signal is produced by the eccentricity in a cold mill is detected. By means of this signal detected, the system of roll mill press down is controlled to compense the thickness variation of the strip. Finally a way of periodical correction is presented to avoid the accumulation of errors appeared in the phase computation.