Abstract
In this paper we present a new Hy- brid Failure Detection and Identification (FDI) and Adaptive Reconfigurable Control (ARC) scheme for achieving the desired flight performance in the pres- ence of multiple control effector failures that oc- cur short time apart. The failures include lock-in- place and hard-over. The problem of stable control reconfiguration in the presence of such failures is solved using a scheme employing multiple adaptive FDI observers and controllers and a suitably chosen decision-making mechanism. The scheme is shown to guarantee the detection and identification of a failed effector. Due to a convenient structure of the overall system, the observers can be modified on-line to reflect the new operating regime imme- diately following the failure. This enables fast FDI and effective ARC in the case of subsequent fail- ures. The stability of the overall FDI-ARC system is demonstrated using the Lyapunov method, while the approach is illustrated through numerical sim- ulations of the F-18 aircraft during carrier landing.
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