Abstract

The objective cf this article is one of regulation of the output product thickness of a two-stand cold-rolling mill. The design of a compensator which regulates the closed loop system to a nominal operating point against step disturbances occurring as sudden changes in the input material thickness and variations in the rolling frictions at the two stands is developed. A linearized mathematical model derived by Smith (1969), valid for fluctuations about the steady-state operating point is multivariate, fully interacting, and contains a time delay representing the travel time of the metal between stands. Linear optimal control theory combined with digital simulation is used to derive the control. The control proposed provides acceptable dynamic performance and is intensitive to the steady-state errors in the process model.

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