Selection index synthesis for 2-level AFTC design
Résumé
In this paper, a two-level reconfiguration action is used to design an Active Fault Tolerant Control system. The first level of the procedure is triggered when the impact of the fault on the system performance is limited. The reconfi- gurable controller is updated by the new post-fault system model. At the second level a dynamic reference modification based on Reference Governor is proposed. The idea consists of modifying the set-point or reference according to the allo- wable performance degradation and the system constraints which become more strict after fault occurrence in order to avoid any actuator saturation and ensure system stability. A selection index is synthesized in order to commute from level 1 to level 2. The effectiveness of the proposed solution is illustrated by an F14 flight control subjects to actuator faults and constrained on the actuator dynamic ranges.