DocumentCode :
1321742
Title :
Active compensation of roll eccentricity in rolling mills
Author :
Kugi, Andreas ; Haas, Werner ; Schlacher, Kurt ; Aistleitner, Karl ; Frank, Helge M. ; Rigler, Günter W.
Author_Institution :
Dept. of Autom. Control & Electr. Drives, Johannes Kepler Univ., Linz, Austria
Volume :
36
Issue :
2
fYear :
2000
Firstpage :
625
Lastpage :
632
Abstract :
This paper is concerned with the active compensation of the roll-eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons, e.g., inexact roll grinding or nonuniform thermal expansion of the rolls. The increasing demands on the thickness tolerances require new methods for the active compensation of the contribution of the roll eccentricity to the final thickness deviation. The presented method is based on the factorization approach over the set of stable transfer functions in combination with an adaptive least-mean-squares algorithm derived from the projection theorem. Here, the authors take advantage of the fact that the eccentricity-caused disturbance is periodic with a frequency proportional to the measured angular velocity of the rolls. Furthermore, it turns out that the presented concept fits the conventional control circuit of automatic gauge control in an optimal way. Simulation results for a cold rolling mill and measurement results for a hot strip mill demonstrate the feasibility and the excellent performance of the design
Keywords :
adaptive control; compensation; control system analysis; control system synthesis; least mean squares methods; metallurgical industries; process control; rolling mills; shape control; transfer functions; active compensation; adaptive least-mean-squares algorithm; angular velocity; factorization approach; feasibility; inexact roll grinding; nonuniform thermal expansion; performance; periodic disturbances; roll eccentricity; rolling mills; stable transfer functions; strip exit thickness; thickness tolerances; Angular velocity; Automatic control; Circuits; Frequency measurement; Milling machines; Optimal control; Strips; Thermal expansion; Transfer functions; Velocity measurement;
fLanguage :
English
Journal_Title :
Industry Applications, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-9994
Type :
jour
DOI :
10.1109/28.833781
Filename :
833781
Link To Document :
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