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| 2. |
- Glad, Torkel, 1947-
(author)
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Observability and Nonlinear Dead Beat Observers
- 1983
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In: Proceedings of the 22nd IEEE Conference on Decision and Control. - Linköping : Linköping University. ; , s. 800-802
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Conference paper (peer-reviewed)abstract
- It is shown that conditions that guarantee observability for continuous time nonlinear systems also imply observability for discrete measurements. This is used to show the existence of nonlinear dead beat observers.
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| 3. |
- Glad, Torkel, 1947-
(author)
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On the Gain Margin of Nonlinear and Optimal Regulators
- 1982
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In: Proceedings of the 21st IEEE Conference on Decision and Control. - Linköping : Linköping University. ; , s. 957-962
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Conference paper (peer-reviewed)abstract
- The robustness of non-linear regulators for nonlinear systems with respect to variations in gain is investigated. It is shown that there exist regulators that produce asymptotically stable closed loop systems but do not tolerate any variation in gain without instability. However, if the linearized closed loop system is also asymptotically stable, then there is always some gain margin. For a wide class of optimal regulators it is shown that the gain margin is infinite with respect to increases in gain and that decreases down to 0.5 can be tolerated. The robustness properties of linear quadratic control laws are thus generalized.
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| 4. |
- Glad, Torkel, 1947-
(author)
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On the Gain Margin of Nonlinear and Optimal Regulators
- 1984
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In: IEEE Transactions on Automatic Control. - : IEEE Control Systems Society. - 0018-9286 .- 1558-2523. ; 29:7, s. 615-620
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Journal article (peer-reviewed)abstract
- The robustness of nonlinear regulators for nonlinear systems with respect to variations in gain is investigated. It is shown that there exist regulators that produce asymptotically stable closed-loop systems, but do not tolerate any variation in gain without instability. However, if the linearized closed-loop system is also asymptotically stable, then there is always some gain margin. For a wide class of optimal regulators, it is shown that the gain margin is infinite with respect to increases in gain and that decreases down to 0.5 can be tolerated. The robustness properties of linear quadratic control laws are thus generalized.
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| 5. |
- Glad, Torkel, 1947-, et al.
(author)
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Reglerteknik : grundläggande teori
- 1981
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Book (other academic/artistic)abstract
- Boken behandlar grundläggande metoder för beskrivning, analys och dimensionering av reglersystem. Klassiska angreppssätt som rotortmetoden och frekvensanalys med hjälp av Bodediagram diskuteras.Dessutom introduceras tillståndsvariabler och metoder att analysera känslighet och robusthet hos reglersystem. Grunderna för behandling av olinjära fenomen och digital implementering av regulatorer diskuteras.Bokens omfattning motsvarar en typisk grundkurs i reglerteknik inom civilingenjörsutbildningen.
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| 6. |
- Glad, Torkel, 1947-
(author)
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The Gain Margin of Optimal Bang-Bang Control Systems
- 1984
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In: Proceedings of the 23rd IEEE Conference on Decision and Control. - Linköping : Linköping University. ; , s. 941-943
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Reports (other academic/artistic)abstract
- The gain margin of optimal controllers of bang-band type is considered. It is shown that the gain margin is infinite if the switching surface is such that trajectories that reach it stay in the surface. For other types of switching surface an example shows that the behavior is more complicated when the gain is increased.
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