Abstract
This paper is devoted to the issues of robust fault detection for a class of observer-based feedback control systems with model uncertainties, disturbances and faults. As the observer-based feedback controller structure allows a direct access to the residual signal, a robust post-filter is designed such that the modified residual satisfies the optimized robustness against disturbances under a desired sensitivity to faults. Moreover, the detection performance of the designed fault detection system is analyzed. Simulation results are given at the end of the paper to demonstrate the effectiveness of the proposed schemes.
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This work has been supported by the National Natural Science Foundation of China under Grants 61633001, 61473004, and 61603033, Beijing Natural Science Foundation under Grant 4174096, and the Fundamental Research Funds for the Central Universities under Grant FRF-TP-16-084A1.
Appendices
Appendix
Appendix 1: The Observer-Based Controller Design
Lemma 2
Given \(\gamma _d>0\), the observer-based feedback control systems (3) are stable and satisfy the \(H_\infty \) performance \(\Vert z(t)\Vert _2\le \gamma _d\Vert d(t)\Vert _2\), if there exist positive definite matrices \(P_1,~P_{10},~P_2\in {\mathcal {R}}^{n\times n}\), matrices \(F,~F_{0}\in {\mathcal {R}}^{n_u\times n},~\hat{L}\in {\mathcal {R}}^{n\times p}\), and a positive constant \(\varepsilon \) such that
where
Furthermore, the observer gain is given by \(L=P_2^{-1}\hat{L}\) and the feedback control gain F is computed by an iterative LMI algorithm.
Proof
Let the Lyapunov function candidate \(P=\hbox {diag}\{P_1,~P_2\}\). Using the bounded real lemma and the matrix inequalities
the conclusion is evident. \(\square \)
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Zhao, Z., Yang, Y., Ding, S.X. et al. Robust Fault Detection for Observer-Based Feedback Control Systems. Circuits Syst Signal Process 37, 3364–3382 (2018). https://doi.org/10.1007/s00034-017-0726-z
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DOI: https://doi.org/10.1007/s00034-017-0726-z