Abstract In this chapter, three main limitations of the classical implementation of the MMAE method to isolate faults based on predefined fault hypotheses are highlighted. The first limitation concerns the number of filters that must be designed in order to span the range of possible fault scenarios, which must be limited due to computational load. The second limitation appears when an actuator is locked at an arbitrary non-zero position that biases the residuals of the KFs, leading to inaccurate fault detection and state estimation. Third, most of the implementations of an MMAE method only work efficiently around predefined operating conditions. This chapter presents a nonlinear actuator FDI system, which works over the entire operating envelope of an aircraft. Locked-in-place and floating actuator faults can be handled. The robustness of the FDI system is enhanced by the use of auxiliary excitation signals. The FDI system is also capable of handling two simultaneous actuator failures with no increase of the computational load. The complete system has been demonstrated in simulation with a nonlinear model of a model aircraft in moderate to severe wind conditions.
Nonlinear Fault Detection and Isolation System
2009-01-01
46 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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