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Träfflista för sökning "WFRF:(Christiansson Anna Karin 1947 ) srt2:(2000-2004)"

Sökning: WFRF:(Christiansson Anna Karin 1947 ) > (2000-2004)

  • Resultat 11-14 av 14
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11.
  • Lennartson, Bengt, et al. (författare)
  • Low order sampled data H∞ control using the delta operator and LMIs
  • 2004
  • Ingår i: Decision and Control, 2004. CDC. 43rd IEEE Conference on. ; , s. 4479-4484
  • Konferensbidrag (refereegranskat)abstract
    • A procedure for H∞ optimization of low order controllers for discrete-time and sampled-data systems is presented in this paper. Generally, low order H∞ controllers may be achieved by solving bilinear matrix inequalities (BMIs). In this paper an iterative alternation between two LMIs gives a suboptimal solution. To avoid local minima in this search the initial controller is obtained by a frequency weighted controller reduction scheme, where the closed loop properties of a full order controller is taken into account. A minimal number of parameters in the state space realization of the controller also reduces the complexity and improves numerical robustness. The complete presentation is based on delta operator models, which shows a close relationship between the continuous- and discrete-time solutions. The sensitivity of the ordinary discrete-time shift operator LMI formulation to small sampling periods is also analyzed.
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14.
  • Lennartson, Bengt, et al. (författare)
  • Unified, periodic & sampled data H∞ control using the delta operator
  • 2004
  • Ingår i: Decision and Control, 2004. CDC. 43rd IEEE Conference on. ; , s. 2364-2369
  • Konferensbidrag (refereegranskat)abstract
    • A unified and general framework is presented for H∞ control of mixed continuous-time and discrete-time time-varying (periodic) systems. Using the delta operator, a close relationship is shown between the continuous- and discrete-time solutions. No assumptions are made on certain system matrices being zero or normalized, which makes the approach general and easy to apply. A combined continuous/discrete-time lifting procedure is shown to be useful, especially for ill-conditioned systems. This procedure together with the delta formalism results in a numerically robust design method concerning both short and long sampling periods for systems with W-conditioned dynamics, including widely spread eigenvalues.
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  • Resultat 11-14 av 14

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