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Identification of processes in closed loop—identifiability and accuracy aspects

Gustavsson, Ivar; Ljung, Lennart and Söderström, Torsten (1977) In Automatica 13(1). p.59-75
Abstract
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.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Automatica
volume
13
issue
1
pages
59 - 75
publisher
Pergamon
external identifiers
  • scopus:0017360813
ISSN
0005-1098
DOI
10.1016/0005-1098(77)90009-7
language
English
LU publication?
no
id
2be44ad1-1767-46eb-8018-99363f89f087
date added to LUP
2018-12-09 17:43:33
date last changed
2019-01-06 14:19:21
@article{2be44ad1-1767-46eb-8018-99363f89f087,
  abstract     = {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.},
  author       = {Gustavsson, Ivar and Ljung, Lennart and Söderström, Torsten},
  issn         = {0005-1098},
  language     = {eng},
  number       = {1},
  pages        = {59--75},
  publisher    = {Pergamon},
  series       = {Automatica},
  title        = {Identification of processes in closed loop—identifiability and accuracy aspects},
  url          = {http://dx.doi.org/10.1016/0005-1098(77)90009-7},
  volume       = {13},
  year         = {1977},
}