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New Results in Disturbance Decoupled Fault Reconstruction in Linear Uncertain Systems Using Two Sliding Mode Observers in Cascade

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. It is found that this scheme will enable DDFR to be achieved for a wider class of systems compared to previous work of using one single observer. A simulation example validates the claims made in this paper.

Kok Ng and Chee Tan


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