Control Relevant Identification of Sheet and Film Processes
Featherstone, Andrew Paul
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https://hdl.handle.net/2142/82436
Description
Title
Control Relevant Identification of Sheet and Film Processes
Author(s)
Featherstone, Andrew Paul
Issue Date
1997
Doctoral Committee Chair(s)
Braatz, Richard D.
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, General
Language
eng
Abstract
Sheet and film processes, which are characterized by a large number of inputs and outputs and strong interactions, illustrate the difficult and interesting control relevant identification problems existing in large scale processes. Existing techniques for model identification require substantially more input-output data than are typically available for these processes, and do not inform the control engineer on how to conduct experiments to provide the most useful process information for control purposes. Theoretical results dealing with the model identification requirements for controller performance and stability are developed. Next, the level of accuracy in the identified model is quantified using rigorous statistical analysis techniques. A direct relationship is derived between the model accuracy and controller design. In order to improve model accuracy, methods are developed to address the problem of input design, where input moves are selected to provide data rich in the process information relevant for closed loop control. This is followed by controller simulation results which demonstrate how the quality of the model affects the closed loop performance resulting from two controller design methods. A proposed combined identification and control procedure provides more accurate estimated models and higher quality cross-directional film profiles than industrially accepted identification and control procedures.
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