Disturbance decoupled fault reconstruction using cascaded sliding mode observers

Kok Ng, Chee Pin Tan, Denny Oetomo

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39 Citations (Scopus)
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This paper presents a disturbance decoupled fault reconstruction (DDFR) scheme using cascaded sliding mode observers (SMOs). The processed signals from a SMO are found to be the output of a fictitious system which treats the faults and disturbances as inputs; the ‘outputs’ are then fed into the next SMO. This process is repeated until the attainment of a fictitious system which satisfies the conditions that guarantee DDFR. It is found that this scheme is less restrictive and enables DDFR for a wider class of systems compared to previous work when only one or two SMOs were used. This paper also presents a systematic routine to check for the feasibility of the scheme and to calculate the required number of SMOs from the outset and also to design the DDFR scheme. A design example verifies its effectiveness.
Original languageEnglish
Pages (from-to)794-799
Issue number5
Publication statusAccepted/In press - 14 Sept 2011


  • Disturbance rejection
  • Sliding mode
  • Observers
  • Fault diagnosis

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