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Zbl 0858.93040
Wang, H.; Daley, S.
Actuator fault diagnosis: An adaptive observer-based technique. (English)
[J] IEEE Trans. Autom. Control 41, No.7, 1073-1078 (1996). ISSN 0018-9286

An adaptive observer technique is considered for the detection and diagnosis of actuator faults in deterministic systems. Two observers, a fixed detection observer, and an adaptive diagnostic observer are constructed separately to detect and diagnose the fault. A general situation where the system is under either model uncertainty or external disturbances is discussed in detail and a modification of the adaptive diagnostic algorithm is proposed to enhance robustness. Under the assumption that the observer gain matrix can be selected such that the resulting observation error is strictly positive real, it is shown that the adaptive diagnostic algorithms yield a desired dynamic performance for fault diagnosis. Furthermore, the selection of the threshold for fault detection is discussed, and some simulation examples are given.
[K.Marti (Neubiberg)]

MSC 2000:: *93C40 Adaptive control systems
90B25 Reliability, etc.
93B07 Observability

Keywords: adaptive observer; detection; diagnosis; actuator faults; robustness; positive real

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