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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 10, 2008
Accepted January 9, 2009

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Improved fourier transform to estimate frequency responses

Yu Jin Cheon Chun Ho Jeon Jietae Lee Su Whan Sung^†

Department of Chemical Engineering, Kyungpook National University, 1370Sankyeok-dong, Buk-gu, Daegu 702-701, Korea

suwhansung@knu.ac.kr

Korean Journal of Chemical Engineering, July 2009, 26(4), 925-929(5), 10.1007/s11814-009-0155-1

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Abstract

Abstract.For the automatic tuning of PID controllers, a new identification method is proposed to estimate the frequency responses of the process from the activated process input and output. It can extract many more frequency responses as well as guarantee better accuracy compared with the previous describing function analysis algorithm. Also, the proposed method can be applied to the case that the initial part of the activated process input and output is periodic_x000D_ (cyclic-steady-state), whereas the previous method using the modified Fourier transform cannot incorporate the case.

Keywords

Frequency Response Identification Autotuning PID

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