Fast Robust Adaptive Backstepping Control with Its Application to Fault-Tolerant Flight Envelope Protection

摘要

In this paper, a fast robust adaptive backstepping (FRAB) flightrnenvelope protection controller is proposed to deal with nonlinear aircraftrnsystem with partial loss faults in structure. Firstly, the nonlinearrnlongitudinal dynamics model of a large transport aircraft is built up.rnSecondly, a FRAB controller using fast terminal sliding mode and radialrnbasis function neutral network (RBFNN) is designed to track the pilot’srncommand. Furthermore, two protection schemes of command limiting andrncontrol mode switching are proposed to implement the flight envelopernprotection task in this study. Simulation results of the Boeing 747 airplanernmodel show that the proposed algorithm has robust stability and betterrnperformances in overshoot, settling time, and steady error compared withrnconventional backstepping methods. The effectiveness of the developedrnalgorithm for flight envelope protection has been validated throughrnsimulation with model uncertainties, disturbances, and structural faults.