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Sökning: WFRF:(Åström Karl)

  • Resultat 21-30 av 872
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21.
  • Wittenmark, Björn, et al. (författare)
  • Computer Control: An Overview
  • 2002
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Computer control is entering all facets of life from home electronics to production of different products and material. Many of the computers are embedded and thus ``hidden'' for the user. In many situations it is not necessary to know anything about computer control or real-time systems to implement a simple controller. There are, however, many situations where the result will be much better when the sampled-data aspects of the system are taken into consideration when the controller is designed. Also, it is very important that the real-time aspects are regarded. The real-time system influences the timing in the computer and can thus minimize latency and delays in the feedback controller. The paper introduces different aspects of computer-controlled systems from simple approximation of continuous time controllers to design aspects of optimal sampled-data controllers. We also point out some of the pitfalls of computer control and discusses the practical aspects as well as the implementation issues of computer control. Published as a Professional Briefs by IFAC.
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24.
  • Åström, Karl Johan, et al. (författare)
  • A simple non-linear drum boiler model
  • 1975
  • Ingår i: International Journal of Control. - : Informa UK Limited. - 0020-7179 .- 1366-5820. ; 22:5, s. 739-740
  • Tidskriftsartikel (refereegranskat)abstract
    • This note gives an improved version of a previously published model for a drum boiler.
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25.
  • Åström, Karl Johan, et al. (författare)
  • A simplified non-linear model of a drum boiler - turbine unit
  • 1972
  • Ingår i: International Journal of Control. - : Informa UK Limited. - 0020-7179 .- 1366-5820. ; 16:1, s. 145-169
  • 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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27.
  • Åström, Karl Johan, et al. (författare)
  • Design of decoupled PI controller for two-by-two systems
  • 2002
  • Ingår i: IEE Proceedings: Control Theory and Applications. - : Institution of Engineering and Technology (IET). - 1350-2379 .- 1359-7035. ; 149:1, s. 74-81
  • Tidskriftsartikel (refereegranskat)abstract
    • The design of PI controllers for systems with interacting loops is discussed. It is advantageous to deal with the interaction at the loop level, because supervisory control seldom has sufficient bandwidth. A new scheme based on modified scalar PI design and static decoupling is developed, in which the frequency characteristic of the coupling between the lower-level loops is taken into account. This leads to a design method emphasising the trade-off between the individual loop performances and the interaction indices introduced in the paper. The controller is easily implemented, due to its simple configuration based on standard components. A useful observation is that the interaction can be reduced substantially by using set-point weighting. The method is applied to three examples, including a model of a new laboratory system called the quadruple-tank process
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28.
  • Åström, Karl Johan, et al. (författare)
  • Expert Control
  • 1986
  • Ingår i: Automatica. - : Elsevier BV. - 0005-1098. ; 22:3, s. 277-286
  • Tidskriftsartikel (refereegranskat)abstract
    • There has been substantial progress in the theory and practice of automatic control through application of mathematical analysis and numerics. Symbolic data processing has, however, so far only had marginal influence on control systems despite the fact that the actual engineering of control systems contains a substantial amount of heuristic logic. This paper shows how the logic may be replaced by an expert system. This leads to simplification of conventional systems and makes it possible to obtain control systems with new capabilities.
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29.
  • Åström, Karl Johan, et al. (författare)
  • Expert Control
  • 1993
  • Ingår i: An introduction to intelligent and autonomous control. - 0792392671
  • Bokkapitel (refereegranskat)
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