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- Li, Zheng, et al.
(författare)
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Minimum Variance Prediction for Linear Time-Varying Systems
- 1994
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Ingår i: IFAC Proceedings Volumes. ; 27:8
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Konferensbidrag (refereegranskat)abstract
- In this paper we study the problem of minimum variance prediction for linear time-varying systems. We consider the standard time-varying autoregression moving average (ARMA) model and develop a predictor which guarantees minimum variance prediction for a large class of linear time-varying systems. The predictor is developed based on a pseudocommutation technique for dealing with noncommutativity of linear time-varying operators in a transfer operator framework. We also show connections between this input-output predictor and the Kalman predictor via an example.
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- Wittenmark, Björn
(författare)
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Adaptive stability augmentation
- 1990
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Ingår i: Automatica. - 0005-1098. ; 26:4, s. 699-707
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Tidskriftsartikel (refereegranskat)abstract
- Most adaptive controllers do not assume any a priori knowledge about the process to be controlled. In most situations there is, however, some knowledge about the process. This knowledge should be used to improve the performance compared to the “black box” approach of earlier adaptive controllers. The a priori knowledge is in this paper used in the estimation of the process and also in the design of the controller. The use in the design is new compared to earlier approaches. The a priori knowledge is used here to design a nominal controller. The unmodelled part of the process is estimated and an adaptive stability augmentation signal is added to the nominal controller. Different types of a priori knowledge and design methods are discussed and the performances are investigated through analysis and simulation.
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- Wittenmark, Björn
(författare)
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On the Choice of Design Method in Adaptive Control
- 1990
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Ingår i: 29th IEEE Conference on Decision and Control.
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Konferensbidrag (refereegranskat)abstract
- The selections of design method and design specifications for sampled-data adaptive controllers are discussed. The following issues are considered: choice of design method, choice and effect of sampling frequency and antialiasing filters, interplay between estimation and design, and implementation aspects and numerics.
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- Wittenmark, Björn, et al.
(författare)
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Some Aspects on Pole-Placement Design
- 1990
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Ingår i: IFAC Proceedings Volumes : 11th IFAC World Congress on Automatic Control - 11th IFAC World Congress on Automatic Control. ; 23:8:1, s. 211-216
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Konferensbidrag (refereegranskat)abstract
- Pole-placement design for SISO systems are discussed in input-output formulation. It is shown how the different design parameters influence the performance of the closed loop system. For instance, the influence of sampling period, anti-aliasing filter, and desired closed loop performance are treated in detail. Rules of thumb for the choice of the different parameters are given.
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