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Robust control strategies for an electric motor driven accumulator with elastic webs
David Kuhm1, Dominique Knittel, Marie-Ange Bueno
1Web handling research Center, UFR Physique et Ingénierie, Campus Meinau, University of Strasbourg, 17, rue du Maréchal Lefebvre, 67100 Strasbourg, France.
Abstract:
This paper concerns the modelling of an accumulator used in industrial elastic web processing plant to allow changing material roll while the rest of the line remains at a constant web velocity. A nonlinear model of a motor actuated accumulator is first summarized. This model is derived from the physical relationships describing web tension and velocity dynamics in each web span of this accumulator. A linear model is deduced from the nonlinear one around a working point for frequency domain analysis. Thus the effect of some mechanical accumulator parameter variations are analyzed. In a second part, multi-model industrial PI controllers, adjusted with evolutionary algorithm on our realistic nonlinear model are compared with multi-model H∞ controllers. Both controllers allow good robustness against mechanical parameter variations.
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