| 1. |
- Gustavsson, Ivar, et al.
(författare)
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Identification of Processes in Closed Loop-Identifiability and Accuracy Aspects
- 1977
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Ingår i: Automatica. - : Elsevier. - 0005-1098 .- 1873-2836. ; 13, s. 59-75
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Tidskriftsartikel (refereegranskat)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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| 2. |
- Söderström, Torsten, et al.
(författare)
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A Theoretical Analysis of Recursive Identification
- 1978
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Ingår i: Automatica. - : Elsevier. - 0005-1098 .- 1873-2836. ; 14:231-244
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Tidskriftsartikel (refereegranskat)abstract
- In this paper five different recursive identification methods will be analyzed and compared, namely recursive versions of the least squares method, the instrumental variable method, the generalized least squares method, the extended least squares method and the maximum likelihood method. They are shown to be similar in structure and need of computer storage and time. Making use of recently developed theory for asymptotic analysis of recursive stochastic algorithms, these methods are examined from a theoretical viewpoint. Possible convergence points and their global and local convergence properties are studied. The theoretical analysis is illustrated and supplemented by simulations.
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| 3. |
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| 4. |
- Söderström, Torsten, et al.
(författare)
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Analysis of some On-Line Identification Methods
- 1976
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Ingår i: Proceedings of the 4th IFAC Symposium on Identification and System Parameter Estimation. - 9780444851130
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Konferensbidrag (refereegranskat)
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| 5. |
- Söderström, Torsten, et al.
(författare)
-
Identifiability Conditions for Linear Multivariable Systems Operating under Feedback
- 1976
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Ingår i: IEEE Transactions on Automatic Control. - : IEEE Control Systems Society. - 0018-9286 .- 1558-2523. ; 21:6, s. 837-840
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Tidskriftsartikel (refereegranskat)abstract
- The possibility of estimating the parameters of a dynamic system when it is operating in closed loop is examined. Earlier considered ways of designing regulators to achieve desired identifiability properties are unified and generalized. The result of the analysis of this short paper gives a simple criterion, which contains earlier known conditions as simple special cases.
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