International Journal of Control, Automation and Systems

, Volume 8, Issue 3, pp 506–518

New results in disturbance decoupled fault reconstruction in linear uncertain systems using two sliding mode observers in cascade


  • Kok Yew Ng
    • School of EngineeringMonash University
    • School of EngineeringMonash University
  • Zhihong Man
    • Robotics and Mechatronics EngineeringSwinburne University of Technology
  • Rini Akmeliawati
    • Kuliyyah of EngineeringInternational Islamic University
Regular Papers Control Theory

DOI: 10.1007/s12555-010-0303-8

Cite this article as:
Ng, K.Y., Tan, C.P., Man, Z. et al. Int. J. Control Autom. Syst. (2010) 8: 506. doi:10.1007/s12555-010-0303-8


This paper presents a disturbance decoupled fault reconstruction (DDFR) scheme using two sliding mode observers in cascade. Measurable signals from the first observer are found to be the output of a fictitious system that is driven by the fault and disturbances. Then the signals are fed into a second observer which will reconstruct the fault. Sufficient conditions which guarantee DDFR are investigated and presented in terms of the original system matrices, and they are found to be less conservative than if only one single observer is used; therefore DDFR can be achieved for a wider class of systems using two sliding mode observers. A simulation example validates the claims made in this paper.


Disturbance decouplingfault reconstructionrobustnesssliding mode observer

Copyright information

© Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers and Springer-Verlag Berlin Heidelberg 2010