Abstract: Aim at the problem of roll eccentricity in measuring on line and presenting accuracy, an new effective solution is provided. According to the theory of plate and strip rolling, the roll eccentricity online soft measurement model is established, through the collected pressing cylinder displacement, rolling force, export plate thickness data during the rolling process, the roll eccentricity can be estimated. In order to solve the roll eccentricity signal frequency and cycle diversification when the rolling speed changes, the order tracking technique is applied, the time marks of same angle sampling are calculated, and the values of resample in angle domain are calculated by Lagrange interpolation method. The time sequence of rolling process data is translated into angle domain sequence. And the mismatching of data due to the lag of thickness signal is solved by moving in angle domain. The signal of roll eccentricity is analysis and extracted by wavelet filtering and coherence time average method, which is the basement work to compensate the roll eccentricity effectively.

Key words: coherent average, cold strip mill, order tracing, roll eccentricity