SLIDING MODE RECONFIGURABLE CONTROL FOR COSMIC RAYS FAULTS IN FLIGHT SYSTEMS

ABSTRACT In this paper, a FTFC system is designed to handle a cosmic rays fault affecting actuator control signal. The geometric approach is used to design the fault diagnosis module. This module determines the gravity of the fault and calculates its parameters. Based thereon, a new reconfigurable Sliding Mode Control law is designed and applied on the longitudinal linear model of the F-16 aircraft. Simulations are performed using Matlab®/Simulink® to show the effectiveness of the proposed approach. KEYWORDS following Cosmic rays faults, Actuator faults, Fault detection and diagnosis, Fault tolerant flight control, Sliding mode control, Geometric approach for fault reconstruction, Lyapunov stability. INTRODUCTION In safety critical systems such as avionics, degraded performance must be instantly maintained to tolerate faults and keep the system in working condition. Isermann [1] defined a fault as “ an unpermitted deviation of at least one characteristic property (feature) of the system from the acceptable, usual, standard condition