Smith predictor based sliding mode control for a class of unstable processes

Mehta, Utkal V. and Rojas, R. (2015) Smith predictor based sliding mode control for a class of unstable processes. Transactions of the Institute of Measurement and Control, NA . pp. 1-9. ISSN 0142-3312

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Abstract

A strategy to regulate unstable processes using a modified Smith predictor based sliding mode controller (SP-SMC) is illustrated. The proposed scheme presents disturbance rejection and optimal control input usage with overall improved regulatory performances. The unstable process with time delay is first estimated using a simple measurement of limit cycle output obtained from a modified relay experiment. Then this paper extends a work on SP-SMC for unstable processes, which leads to significant improvements in its regulatory capacities of reference inputs and disturbances. A new control law is incorporated in the discontinuous part of sliding mode control such that the overall performance improves significantly. The metaheuristic search algorithm with some modifications has been implemented successfully to satisfy the new control performance index. The robustness of the controller is also tested under the process uncertainty. Illustrative examples show the simplicity and superiority of the presented design method over previously published approaches.

Item Type:	Journal Article
Additional Information:	Published online only
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > Robotics and Automation
Divisions:	Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics
Depositing User:	Utkal Mehta
Date Deposited:	24 Jan 2016 23:52
Last Modified:	23 May 2016 22:53
URI:	http://repository.usp.ac.fj/id/eprint/8668

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