Brief paper: Communication and control co-design for networked control systems

  • Authors:

  • Lei Zhang;Dimitrios Hristu-Varsakelis

  • Affiliations:

  • Mechanical Engineering and Institute for Systems Research, University of Maryland, College Park, MD 20742, USA;Department of Applied Informatics, University of Macedonia, Thessaloniki 54006, Greece

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2006

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Abstract

This paper discusses the stabilization of a networked control system (NCS) in which sensors and actuators of a plant exchange information with a remote controller via a shared communication medium. Access to that medium is governed by a pair of periodic communication sequences. Under the model utilized here, the controller and plant handle communication disruptions by ''ignoring'' (in a sense to be made precise) sensors and actuators that are not actively communicating. This choice has the effect of significantly reducing the complexity of selecting control/communication policies. It is shown that, for discrete-time NCS, the reachability and observability of the plant can be preserved if the communication sequences are chosen properly. We propose a method for exponentially stabilizing a NCS by first identifying a pair of communication sequences that preserve reachability and observability and then designing an observer-based feedback controller based on those sequences.