Ennineerinn Control - Oriented Modeling of Sheet and Film Processes
نویسندگان
چکیده
Sheet and film processes pose a challenging identification and control problem due to high complexity, poor conditioning, and limited input output data. The interaction between model accuracy and closed-loop performance is explored for sheet and film processes using a model decomposition in terms of two static orthogonal matrices in series with a diagonal transfer--function matrix. It is shown that the accuracy of the diagonal elements of the transfer--function matrix directly spec$es the closed-loop performance achievable by a model-based controller. This motivates the development of a combined identification and control procedure in which the controller is designed to be robust to model inaccuracies quant$ed during ident$cation. The resulting controller is compared to an industrially accepted controller design method for two examples7 including a simulated blown-film process. Based on the theoretical results and simulations, it was concluded that the poor performance often reported for existing industrial sheet and film process-control systems is likely due to signs of the model gains being incorrectly identified.
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تاریخ انتشار 2004