On the Origin of Torsional Vibrations in Hot Rolling Mills and a Possible Remedy
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Published:2004-12-01
Issue:4
Volume:126
Page:811-823
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ISSN:0022-0434
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Container-title:Journal of Dynamic Systems, Measurement, and Control
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language:en
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Short-container-title:
Author:
Belli P.1, Bittanti S.2, De Marco A.2
Affiliation:
1. ABB, Via L. Lama 33, 20099 Sesto S. Giovanni (Mi), Italy 2. Politecnico di Milano, Dip. di Elettronica e Informazione, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
Abstract
Hot rolling mills suffer from severe torsional vibrations in particular working conditions (thin thickness). These vibrations are often explained as the result of an exogenous disturbance amplified by a resonance effect. In this paper, we show that these vibrations are in fact produced by the interaction between the kinematic chain and the phenomenon of the plastic deformation of the strip occurring in the roll bite. Precisely, the vibrations are the expression of an unstable limit cycle due to the combination of the dynamics associated with these two effects. Starting from this key observation, the vibration attenuation control problem is studied. First of all, by investigating the observability and controllability properties, it can be seen that there is a basic controllability problem in the standard configuration of the plant. To circumvent it, it is proposed to modify some mechanical characteristics so as to ensure the system controllability. Then a suitable active control system based on frequency domain concepts can be designed. The proposed control system neutralizes the torsional vibration, and therefore it allows one to preserve the system integrity while increasing plant efficiency and productivity.
Publisher
ASME International
Subject
Computer Science Applications,Mechanical Engineering,Instrumentation,Information Systems,Control and Systems Engineering
Reference13 articles.
1. Grimble, M. J., and Hearns, G., 1999, “Advanced Control for Hot Rolling Mills,” Advance Control, Highlights of ECC’99, P. M. Frank (ed.), Springer, London, pp. 135–169. 2. Anbe, Y., and Butter, D. H. E., 1992, “Compensation of a Digitally Controlled Static Power Converter for a Damping of Rolling Mill Torsional Vibration,” IEEE Trans. Ind. Appl., 28(2), pp. 427–433. 3. Doi, K., 1987, “Analysis and Control Systems for Shaft Vibration in Steel Rolling Processes,” Kawasaki Steel Giho. 4. Evans, P. R., and Vaughan, N. D., 1996, “Dynamic Characterization of a Rolling Mill,” J. Syst. Control Eng., 210, pp. 259–271. 5. Kugi, A., Novak, R., and Schlacher, K., 2001, “Non-Linear Control in Rolling Mills: A New Perspective,” IEEE Trans. Ind. Appl., 37(5), pp. 1396–1402.
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