Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/71188
Title: Novel use of relays in identifying frequency response points
Authors: Loh, A.P. 
Cai, X.
Tan, W.W. 
Keywords: Frequency response
Identification
Relay auto-tuning
Issue Date: 2001
Source: Loh, A.P.,Cai, X.,Tan, W.W. (2001). Novel use of relays in identifying frequency response points. Proceedings of the American Control Conference 4 : 3288-3293. ScholarBank@NUS Repository.
Abstract: In this paper, relays with hysteresis are used to determine points on the frequency response curve of a plant with a specified gain or phase. On-line algorithms are developed to adjust the parameters of a relay in such a way that the limit cycling conditions correspond to the operating point of interest. When the objective is to find the point with a specified gain, the amplitude of the relay is tuned iteratively. When the objective is to find the point with a specified phase, then the width of the hysteresis is tuned. The plant and its gain cross-over frequency are assumed unknown. The only assumption is that stable limit cycling conditions exist for the plant under relay feedback control. Simulation results show that our algorithms can give accurate identification of the frequency response points. We show further how these tunings can lead to on-line tuning of phase lead and phase lag compensators.
Source Title: Proceedings of the American Control Conference
URI: http://scholarbank.nus.edu.sg/handle/10635/71188
ISSN: 07431619
Appears in Collections:Staff Publications

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