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https://hdl.handle.net/2142/22359
Description
Title
Adaptive dead-time compensation
Author(s)
Brown, Lyndon Joseph
Issue Date
1996
Doctoral Committee Chair(s)
Meyn, Sean P.
Department of Study
Electrical and Computer Engineering
Discipline
Electrical and Computer Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Engineering, System Science
Language
eng
Abstract
In this work a new paradigm for designing controllers for poorly modeled plants with significant dead time is proposed. We show how minimum variance control can be interpreted as dead-time compensation with infinite gain proportional feedback. Based on this interpretation, we develop more general control laws that do not suffer from the drawbacks of high gain feedback. These new controls are compared with the more traditional dead-time compensator, the Smith predictor, and the following directions of research are pursued: (1) The use of adaptation to achieve set-point matching without the use of integration. (2) The stability and convergence of these adaptive dead-time compensators are investigated under a variety of situations including an ideal stochastic framework and a time-varying deterministic framework. (3) Two methods for selecting controller parameters in an optimal manner are presented, and alternative strategies for adaptively generating d-step predictions are discussed. (4) The control laws are applied to a gas metal arc welder, and the resulting closed-loop performance is found to be superior to that for related controllers.
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