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|Title:||Process frequency response estimation from relay feedback|
|Authors:||Wang, Q.-G. |
|Source:||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|
|Appears in Collections:||Staff Publications|
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