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| 2. |
- Ariba, Y., et al.
(författare)
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Simple conditions for $L_2$ stability and stabilization of networked control systems
- 2011
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Ingår i: Proceeding of 8th International Federation of Automatic Control (IFAC) World Congress. ; , s. 96-101
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Konferensbidrag (refereegranskat)abstract
- The stability analysis and stabilization of networked control systems subject todata loss and time-varying transmission delays are explored. The stability result is based onquadratic separation and operator theory, which allows to capture the above phenomena intothe single formalism of aperiodic sampling. The obtained stability condition is expressed throughan LMI. The stabilization problem is a bit more involved due to the inherent structure of theobtained LMI. An approximation (dilation) is then proposed to obtain a more tractable LMIfor stabilization. Several examples illustrate the effectiveness of the proposed approach.
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| 3. |
- Briat, C., et al.
(författare)
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The Conservation of Information, Towards an Axiomatized Modular Modeling Approach to Congestion Control
- 2015
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Ingår i: IEEE/ACM Transactions on Networking. - 1063-6692 .- 1558-2566. ; 23:3, s. 851-865
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Tidskriftsartikel (refereegranskat)abstract
- We derive a modular fluid-flow network congestion control model based on a law of fundamental nature in networks: the conservation of information. Network elements such as queues, users, and transmission channels and network performance indicators like sending/acknowledgment rates and delays are mathematically modeled by applying this law locally. Our contributions are twofold. First, we introduce a modular metamodel that is sufficiently generic to represent any network topology. The proposed model is composed of building blocks that implement mechanisms ignored by the existing ones, which can be recovered from exact reduction or approximation of this new model. Second, we provide a novel classification of previously proposed models in the literature and show that they are often not capable of capturing the transient behavior of the network precisely. Numerical results obtained from packet-level simulations demonstrate the accuracy of the proposed model.
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| 5. |
- Demirel, Burak, et al.
(författare)
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Deterministic and stochastic approaches to supervisory control design for networked systems with time-varying communication delays
- 2013
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Ingår i: Nonlinear Analysis. - : Elsevier BV. - 1751-570X .- 1878-7460. ; 10:1, s. 94-110
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Tidskriftsartikel (refereegranskat)abstract
- This paper proposes a supervisory control structure for networked systems with time-varying delays. The control structure, in which a supervisor triggers the most appropriate controller from a multi-controller unit, aims at improving the closed-loop performance relative to what can be obtained using a single robust controller. Our analysis considers average dwell-time switching and is based on a novel multiple Lyapunov-Krasovskii functional. We develop stability conditions that can be verified by semi-definite programming, and show that the associated state feedback synthesis problem also can be solved using convex optimization tools. Extensions of the analysis and synthesis procedures to the case when the evolution of the delay mode is described by a Markov chain are also developed. Simulations on small and large-scale networked control systems are used to illustrate the effectiveness of our approach.
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