| 1. |
- Ljung, Lennart, 1946-
(författare)
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Convergence of an Adaptive Filter Algorithm
- 1978
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Ingår i: International Journal of Control. - : Taylor & Francis. - 0020-7179 .- 1366-5820. ; 27:5, s. 673-693
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Tidskriftsartikel (refereegranskat)abstract
- A state-space representation of a dynamical, stochastic system is given. A corresponding model, parametrized in a particular way, is considered and an algorithm for the estimation of its parameters is analysed. The class of estimation algorithms thus considered contains general output error methods and model reference methods applied to stochastic systems. It also contains adaptive filtering schemes and, e.g. the extended least squares method.It is shown that if a certain transfer function associated with the true system is positive real, then the estimation algorithm converges with probability 1 to a value that gives a correct input-output model.
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| 2. |
- Ljung, Lennart, et al.
(författare)
-
Convergence properties of a method for state estimation in power systems
- 1975
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Ingår i: International Journal of Control. - : Informa UK Limited. - 0020-7179 .- 1366-5820. ; 22:1, s. 113-118
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Tidskriftsartikel (refereegranskat)abstract
- The convergence of a proposed method for state estimation in power systems is analysed for a case with constant state vector. In particular, a set into which estimates obtained by two versions of the SCI method converge is determined.
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| 3. |
- Ljung, Lennart, 1946-, et al.
(författare)
-
Fast Calculation of Gain Matrices for Recursive Estimation Schemes
- 1978
-
Ingår i: International Journal of Control. - : Taylor & Francis. - 0020-7179 .- 1366-5820. ; 27:1, s. 1-19
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Tidskriftsartikel (refereegranskat)abstract
- A sequence of vectors {x(t)} with dimension N is given, such that x(t+1) is obtained from x(t) by introducing p new elements, deleting p old ones, and shifting the others in some fashion. The sequence of vectors $ is sought. This paper presents a method of calculating these vectors with proportional-to-Npoperations and memory locations, in contrast to the conventional way which requires proportional-to-N 2operations and memory locations. A non-symmetric case is also treated.
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| 4. |
- Wittenmark, Björn
(författare)
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Stochastic Adaptive Control Methods: A Survey
- 1975
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Ingår i: International Journal of Control. - : Informa UK Limited. - 0020-7179 .- 1366-5820. ; 21, s. 705-730
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Tidskriftsartikel (refereegranskat)abstract
- There is a vast literature about adaptive (self-organizing, self-optimizing) control systems. The aim of this paper is to point out some of the main ideas. Since there exists good survey papers about several of the classes of adaptive controllers the main part of this paper will concentrate on recent developments. The paper will cover stochastic adaptive controllers. The problem of dual control is given particular attention.
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| 5. |
- Åström, Karl Johan, et al.
(författare)
-
A simple non-linear drum boiler model
- 1975
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Ingår i: International Journal of Control. - : Informa UK Limited. - 0020-7179 .- 1366-5820. ; 22:5, s. 739-740
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Tidskriftsartikel (refereegranskat)abstract
- This note gives an improved version of a previously published model for a drum boiler.
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| 6. |
- Åström, Karl Johan, et al.
(författare)
-
A simplified non-linear model of a drum boiler - turbine unit
- 1972
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Ingår i: International Journal of Control. - : Informa UK Limited. - 0020-7179 .- 1366-5820. ; 16:1, s. 145-169
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Tidskriftsartikel (refereegranskat)abstract
- In the analysis of power systems it is highly desirable to have models of the different power generators. In this paper we present, a model for a drum boiler whose purpose is to describe the gross behaviour of the boiler. The major control variables are fuel flow and control valve setting. The output variables are drum pressure and active output power. The model is verified by experiments on a 160 Mw boiler.
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| 7. |
- Åström, Karl Johan
(författare)
-
Frequency domain properties of Otto Smith regulators
- 1977
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Ingår i: International Journal of Control. - 0020-7179. ; 26:2, s. 307-314
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Tidskriftsartikel (refereegranskat)abstract
- Frequency domain characteristics of Otto Smith regulators are investigated. It is shown that the regulator can be regarded as an ordinary regulator in cascade with a lead network with considerable lead.
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