Fault Tolerant Control of Aircraft Actuating Surfaces using Generalized DI and Integral SM Control

The paper introduces a new fault tolerant control structure against control surface failure, made by a combined use of Generalized Dynamic Inversion (GDI) control and Integral Sliding Mode control (ISMC). The null-control vector in the GDI-based control law parameterizes all the possible control functions that drive the aircraft trajectories to the sliding surface. A simple choice of the null-control vector is made, and is shown to yield closed-loop system stability for the nominal actuator scenario. The small gain theorem is employed to provide an explicit lower limit on the actuator efficiency matrix in the event of faults/failures. The efficacy of the proposed method in tolerating control surface actuator failure is demonstrated on the ADMIRE benchmark model.

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