期刊
IEEE-CAA JOURNAL OF AUTOMATICA SINICA
卷 6, 期 3, 页码 750-759出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JAS.2019.1911492
关键词
Fault detection and isolation; finite-frequency domain; H_/H-infinity technique; unknown input observer; zonotopic threshold analysis
资金
- National Key R&D Program of China [2018YFB 1304600]
- National Natural Science Foundation of China [51805021, U1813220]
- China Postdoctoral Science Foundation [2018M631311]
- Fundamental Research Funds for the Central Universities [XK1802-4]
This work proposes a robust fault detection and isolation scheme for discrete-time systems subject to actuator faults, in which a bank of H_/H-infinity fault detection unknown input observers (UIOs) and a zonotopic threshold analysis strategy are considered. In observer design, finite-frequency H_ index based on the generalized Kalman-Yakubovich-Popov lemma and H-infinity technique are utilized to evaluate worst-case fault sensitivity and disturbance attenuation performance, respectively. The proposed H_/H-infinity fault detection observers are designed to be insensitive to the corresponding actuator fault only, but sensitive to others. Then, to overcome the weakness of predefining threshold for FDI decision-making, this work proposes a zonotopic threshold analysis method to evaluate the generated residuals. The FDI decision-making relies on the evaluation with a dynamical zonotopic threshold. Finally, numerical simulations are provided to show the feasibility of the proposed scheme.
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