Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0967-0661(97)84368-7
Title: Process frequency response estimation from relay feedback
Authors: Wang, Q.-G. 
Hang, C.-C. 
Bi, Q.
Keywords: auto-tuning
FFT
frequency responses
identification
relay feedback
Issue Date: Sep-1997
Citation: Wang, Q.-G., Hang, C.-C., Bi, Q. (1997-09). Process frequency response estimation from relay feedback. Control Engineering Practice 5 (9) : 1293-1302. ScholarBank@NUS Repository. https://doi.org/10.1016/S0967-0661(97)84368-7
Abstract: In this paper, a method for process frequency response identification is proposed, which can identify multiple points on process frequency response from a single relay feedback test. The process input and output transients resulting from a relay feedback cannot be directly converted to the frequency domain to obtain a process frequency response using FFT. A decay exponential is then proposed to modify the process input and output, so that the process frequency response can be identified with the help of FFT. Real-time testing of the method on various processes gives quite accurate process frequency responses, especially in the frequency range [0,ω(c)], which is important for control design and process modelling. The method inherits and extends the advantages of the original relay auto-tuning technique. It can be easily applied to PID auto-tuning and to transfer function modelling.
Source Title: Control Engineering Practice
URI: http://scholarbank.nus.edu.sg/handle/10635/81020
ISSN: 09670661
DOI: 10.1016/S0967-0661(97)84368-7
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