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Journals and Conferences
The deÞning characteristic of a networked control system (NCS) is having a feedback loop that passes through a local area computer network. Our two-step design approach includes using standard control methodologies and choosing the network protocol and bandwidth in order to ensure important closed-loop properties are preserved when a computer network is… (More)
A networked control system is characterized by having a feedback loop closed through a local area network. This paper considers methods for scheduling the use of the network to guarantee both stability and controller performance. We propose and validate algorithms for choosing message identiÞers for dynamically scheduled networked control systems. Two… (More)
The deening characteristic of a networked control system (NCS) is having a feedback loop that passes through a local area computer network. This paper considers nonlinear systems controlled in this manner, and demonstrates that for suuciently high transmission rates, the network may be considered transparent. Three methods of scheduling data packets are… (More)
In this paper we derive Lyapunov stability and lin-earization properties for a class of switched systems. Based on these properties, we use an LMI method to design stabilizing controllers for switched systems. An example is given to illustrate the theoretical results.
A simple model for ideal control networks is proposed in this paper. A model for hybrid systems due to Witsenhausen is extended by adding both a discrete output and input. This extended model is used for modeling an ideal network of interactive hybrid systems. An equivalence is established between the network model and the Witsenhausen model. This… (More)
In this paper we study the effect of external perturbations on a networked control system. We start by assuming that the nonnetworked system without perturbation is exponentially stable. Then, for fast enough networks we show that if the perturbation is bounded the networked system is ultimately bounded and if the perturbation is vanishing then the… (More)
The problem of generating the trajectory for high rise/ high speed elevators is investigated in this paper. Several approaches are used: open loop optimal control, closed loop optimal control and optimization algorithms. Each approach is accompanied by numerical simulations.
In this paper we analyze a class of hybrid systems known as Witsenhausen systems, or switched systems. We study the existence of a solution to the state trajec-tory equation as well as conditions for global existence of solutions. We also present a discussion about the continuity of the solutions with respect to the initial condition. Then we prove some… (More)
This paper provides a general framework of Networked Control Systems. An Internet based NCS is simulated and TCP/IP communication issue of data streams in Networked Control Systems (NCS) is evaluated. The network is simulated with the ns-2 package, a widespread state-of-the-art open-source network simulator package for studying packet dynamics in
In this thesis we model and analyze complex distributed control systems known as control networks. We discuss a class of hybrid systems called switched systems or Witsenhausen systems. We study the existence of a solution to the state trajectory equation as well as conditions for global existence of solutions. We also present a discussion about the… (More)