On discrete-time observer structures for fault estimation

Dusan Krokavec, Anna Filasova, and Pavol Liscinsky
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Full Paper
phmec_16_031.pdf158.94 KBMay 27, 2016 - 10:40am

In the paper there is proposed a modified technique for system faults estimation in linear dynamic systems, which gives the possibility simultaneously estimate the system state and faults. Using a discrete-time observer form, the considered faults are assumed to be additive, thereby the principle can be applied for a broader class of time-varying fault signals. An enhanced algorithm is provided to verify stability of the observer with improved performance of fault estimation. Exploiting the given procedure the proposed technique allows to obtain signals that can be further used for thresholds setting in the fault residual scheme. The approach utilizes the measurable output vector variables and the design conditions are based on linear matrix inequality technique.

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Submission Keywords: 
Linear dynamic systems
discrete-time observers
additive fault estimation
fault residuals
enhanced Lyapunov function
linear matrix inequalities
Submission Topic Areas: 
Model-based methods for fault detection, diagnostics, and prognosis
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