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CLOSED-LOOP IDENTIFICATION A TWO STEP APPROACH 闭环系统辨识论文.pdf

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CLOSED-LOOP IDENTIFICATION A TWO STEP APPROACH 闭环系统辨识论文

J, Proc. Cont. Vol. 7, No. 6, pp. 425-438, 1997 © 1997Elsevier ScienceLtd. All rights reserved Printed in Great Britain 0959-1524/97 S17.00 + 0.00 ELSEVIER PII:S0959-1524(97)00019-X Closed-loop identification: a two step approach Biao Huang and Sirish L. Shah* Department of ChemicalEngineering, UniversityofAlberta, Edmonton.AB, Canada T6G2G6 Received 17May 1996;revised24 February 1997 The accuracy aspects of identification (with respect to both variance and bias of estimates) and the role of filtering in closed-loop identification is discussed in this paper. It is shown that the key difference between closed-loop and open-loop identification is the existence of the sensitivity function. A closed-loop identi- fication algorithm which asymptotically yields the same expressions as open-loop identification, in both variance and bias errors, is proposed. The proposed algorithm is evaluated by simulated examples as well as experiments performed on a computer-interfaced pilot-scale process. © 1997Elsevier Science Ltd Keywords: closed-loop identification;process identification;predictionerror methods;reduced-complexitymodels A necessary prerequisite