Phase-domain filtering pick-up method for roll eccentricity compensation control

A phase-domain filtering pick-up method for roll eccentricity compensation control is proposed by analyzing the mechanism of action of roll eccentricity. This method utilizes the character that the effect intensity of roll eccentricity is closely related to the rotating phase of rollers. In the method the time-domain eccentricity data are transformed to the phase domain of the roller's rotating movement first, and then processed. In the linear phase domain, the eccentricity-related signal shows distinct periodicity, and the periodicity of the other periodic signals in time-domain is weakened during this transformation. The roller's rotating period is used as the target period for cyclic statistics in the linear phase domain. Theoretic analysis indicates that the effect of noise is eliminated and some unwanted periodic signals are choked by the statistics, so the roll eccentricity characteristic information can be picked up adequately. The essential of this proposed method is a kind of comb filter in linear phase-domain. The eccentricity characteristic information can give data support for eccentricity compensation.