On-Line Tuning of Controllers for Unstable Processes

Majhi, S and Atherton, D P (2004) On-Line Tuning of Controllers for Unstable Processes. In: 9th Portugese Conference on Automatic Control, Faro, Portugal, June 7-11, 2004.

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In this paper, a relay based on-line controller tuning method for open-loop unstable processes is presented. In the proposed method, prior to controller tuning a relay in tandem with the controller and plant induces limit cycle oscillations. Based on the limit cycle measurements, a ¿rst order transfer function model of the process dynamics is obtained. Fourier series based curve ¿tting with the options of nonlinear least squares method and trust-region algorithm has been used to detect the peaks and zero crossings of the noisy limit cycle output signals. Using a control tuning method based on the explicit process model the controller settings are re-tuned non-iteratively to achieve enhanced performance without disrupting closed-loop control. The results obtained with this method are presented for typical design examples. A comparison of the performances with those given by earlier workers for unstable processes is presented.

Item Type: Conference or Workshop Item (Paper)
Additional Information: PDF available from http://www.apca.pt/~apca_docs/CONTROLO2004/controlo2004/papers/pdf0052.pdf
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Derek Atherton
Date Deposited: 06 Feb 2012 20:54
Last Modified: 04 Apr 2012 11:32
URI: http://sro.sussex.ac.uk/id/eprint/28662
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