Brief paper: Disturbance decoupled fault reconstruction using cascaded sliding mode observers

Authors:
Kok Yew Ng;Chee Pin Tan;Denny Oetomo
Affiliations:
School of Engineering, Monash University Sunway campus, Jalan Lagoon Selatan, Sunway 46150, Malaysia;School of Engineering, Monash University Sunway campus, Jalan Lagoon Selatan, Sunway 46150, Malaysia;Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
Venue:
Automatica (Journal of IFAC)
Year:
2012

Citing 2
Cited 0

Robust model-based fault diagnosis for dynamic systems

Robust model-based fault diagnosis for dynamic systems
Sliding mode observers for fault detection and isolation

Automatica (Journal of IFAC)

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Abstract

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.