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Decoupling Control of Gage and Tension in Tandem Cold Rolling

Automatic gage control (A.G.C.) system is important for the tandem cold rolling of steel. First, the coupling relationship between strip gage and tension at the first stand is analyzed, and a dynamic gage-tension structure model is acquired. Next, the diagonal matrix decoupling method is studied, based on which a decoupling controller is designed in point of preventing undesirable vibration. Parameters in the controller and gage-tension model were determined by locale measurement and theoretical analysis. Finally, simulation results show that the controller can keep output tension stable and is effective in improving gage control performance