New results in robust actuator fault reconstruction for linear uncertain systems using sliding mode observers

Kok Ng, Chee Pin Tan, Christopher Edwards, Ye Chow Kuang

Research output: Contribution to journalArticle

38 Citations (Scopus)
10 Downloads (Pure)

Abstract

This paper presents a robust actuator fault reconstruction scheme for linear uncertain systems using sliding mode observers. In existing work, fault reconstruction via sliding mode observers is limited to either linear certain systems subject to unknown inputs, relative degree one systems or a specific class of relative degree two systems. This paper presents a new method that is applicable to a wider class of systems with relative degree higher than one, and can also be used for systems with more unknown inputs than outputs. The method uses two sliding mode observers in cascade. Signals from the first observer are processed and used to drive the second observer. Overall, this results in actuator fault reconstruction being feasible for a wider class of systems than using existing methods. A simulation example verifies the claims made in this paper.
Original languageEnglish
Pages (from-to)1294-1319
JournalInternational Journal of Robust and Nonlinear Control
Volume17
Issue number14
DOIs
Publication statusAccepted/In press - 29 Nov 2006

Keywords

  • robustness
  • fault reconstruction
  • sliding mode observer

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