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Identification of Processes in Closed Loop-Identifiability and Accuracy Aspects
Uppsala University, Sweden.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Uppsala University, Sweden.
1977 (English)In: Automatica, ISSN 0005-1098, E-ISSN 1873-2836, Vol. 13, no 1, 59-75 p.Article in journal (Refereed) Published
Abstract [en]

It is often necessary in practice to perform identification experiments on systems operating in closed loop. There has been some confusion about the possibilities of successful identification in such cases, evidently due to the fact that certain common methods then fail. A rapidly increasing literature on the problem is briefly surveyed in this paper, and an overview of a particular approach is given. It is shown that prediction error identification methods, applied in a direct fashion will given correct estimates in a number of feedback cases. Furthermore, the accuracy is not necessarily worse in the presence of feedback; in fact optimal inputs may very well require feedback terms. Some practical applications are also described.

Place, publisher, year, edition, pages
Elsevier, 1977. Vol. 13, no 1, 59-75 p.
Keyword [en]
Closed loop systems, Identification, Identifiability, Accuracy of identification, Optimal experiment design
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-100851DOI: 10.1016/0005-1098(77)90009-7OAI: oai:DiVA.org:liu-100851DiVA: diva2:664033
Available from: 2013-11-13 Created: 2013-11-13 Last updated: 2017-12-06

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Ljung, Lennart

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