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The cross-directional control problem of web forming processes subject to input constraints is investigated. We focus our discussion on the analysis of the properties of a previously proposed anti-windup strategy specially tailored for cross-directional control systems. The strategy first seeks disturbance compensation in those control directions associated with the largest gains, as determined by a spatial frequency decomposition of the system's interaction matrix. Simulation results show that the attained steady state performance is superior to that achieved by traditional MIMO anti-windup schemes and is close to an optimal QP solution to the problem. In addition, the strategy presents a robust stabilizing feature, in the sense that it automatically disengages control in those directions where uncertainty in the sign of the gain can otherwise lead to instability.
Decision and Control, 2002, Proceedings of the 41st IEEE Conference on (Volume:2 )
Date of Conference: 10-13 Dec. 2002