Electrical and Electronic Engineering - Research Publications

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Author: DACIC, DRAGAN × Author: Nesic, Dragan × End date: 2012 × Type: Journal Article ×

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Now showing 1 - 4 of 4
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    Path Following for Nonlinear Systems With Unstable Zero Dynamics: An Averaging Solution
    Dacic, DB ; Nesic, D ; Teel, AR ; Wang, W (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2011-04-01)
    We consider a path-following problem in which the goal is to ensure that the error between the system output and the geometric path is asymptotically less than a prespecified constant, while guaranteeing a forward motion along the path and boundedness of all states. Comparing with the results on this problem, we exploit averaging techniques to develop an alternative simpler solution for a class of nonlinear systems and for paths satisfying a certain geometric condition.
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    Observer design for wired linear networked control systems using matrix inequalities
    Dacic, D ; Nesic, D (PERGAMON-ELSEVIER SCIENCE LTD, 2008-11-01)
    We design an observer-protocol pair to asymptotically reconstruct the states of a linear time-invariant (LTI) plant under communication constraints induced by the network. We parameterize a class of observers and protocols, and for a given network transmission interval, we derive sufficient conditions in terms of matrix inequalities for the existence of an observer-protocol pair in the considered class that asymptotically reconstructs the plant states.
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    Quadratic stabilization of linear networked control systems via simultaneous protocol and controller design
    Dacic, DB ; Nesic, D (PERGAMON-ELSEVIER SCIENCE LTD, 2007-07-01)
    We derive conditions for quadratic stabilizability of linear networked control systems by dynamic output feedback and communication protocols. These conditions are used to develop a simultaneous design of controllers and protocols in terms of matrix inequalities. The obtained protocols do not require knowledge of controller and plant states but only of the discrepancies between current and the most recently transmitted values of nodes' signals, and are implementable on controller area networks. We demonstrate on a batch reactor example that our design guarantees quadratic stability with a significantly smaller network throughput than previously available designs.
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    Path-following for nonlinear systems with unstable zero dynamics
    Dacic, DB ; Nesic, D ; Kokotovic, PV (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-03-01)
    In the path-following problem formulated in this note, it is required that the error between the system output and the desired geometric path eventually be less than any prespecifled constant. If in a nonlinear multiple-input-multiple- output (MIMO) system the output derivatives do not enter into its zero dynamics, a condition relating path geometry and stabilizability of the zero dynamics is given under which a solution to this problem exists. The solution is obtained by combining input-to-state stability and hybrid system methodologies.