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Frank, Paul M.

Enhancement of robustness in observer-based fault detection. (English) Zbl 0813.93003

Int. J. Control 59, No. 4, 955-981 (1994).
Summary: A prerequisite for the feasibility of the technique of observer-based fault detection and isolation (FDI) in dynamic systems is a satisfactory robustness with respect to modelling uncertainties. This paper surveys the most relevant methods to increase the robustness in both the stage of residual generation and residual evaluation. Among these methods are the generalized observer scheme, the robust parity space check, the unknown input and \(H_ \infty\) observer scheme, the decorrelation filter, and the concept of adaptive threshold selection. It is pointed out that the unknown input observer concept, which provides perfect decoupling from the modelling errors or its optimal approximation with the aid of \(H_ \infty\) techniques, constitutes a general framework of robust residual generation that generalizes and unifies numerous other approaches, among them the parity space and detection filter approach. It is further shown that this FDI method can even be applied to a certain class of nonlinear systems.

Cited in 22 Documents

MSC:

93-02 Research exposition (monographs, survey articles) pertaining to systems and control theory
93B35 Sensitivity (robustness)
93E10 Estimation and detection in stochastic control theory
93B07 Observability

Keywords:

observer-based fault detection; isolation; robustness; residual generation; residual evaluation; unknown input observer concept; \(H_ \infty\) techniques
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\textit{P. M. Frank}, Int. J. Control 59, No. 4, 955--981 (1994; Zbl 0813.93003)
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