Abstract: In the process of carrier-based aircraft landing, the probability of rudder failure increases significantly due to the strong interference of complex and harsh sea surface environment, deck movement and ship stern flow, which may lead to the decrease of landing control accuracy and even cause instantaneous instability. This paper combines the advantages of passive fault-tolerant control and active fault-tolerant control, and proposes an active-passive com-posite fault-tolerant flight control method based on direct lift mode. Firstly, aiming at the problem of sudden change of response characteristics of carrier-based aircraft in the early stage of rudder failure, a passive fault-tolerant con-trol method based on predefined time global fast terminal sliding mode is designed to ensure the instantaneous flight stability of carrier-based aircraft in a predetermined time and improve the robustness of the control system. Then, aiming at the high-precision control requirements of the terminal landing, an active adaptive reconfigurable control based on online identification is designed to enhance the attitude and track tracking control ability of the car-rier-based aircraft after failure. Finally, the effectiveness of the method in the case of elevator and flap damage is verified by mathematical simulation and engineering application simulation test. The simulation results show that the proposed method has stronger robustness and control performance than the direct lift PID landing control meth-od and single passive or active fault-tolerant control under different degrees of rudder damage.

Key words: Direct lift landing, active-passive combined fault-tolerant control, sliding mode control, adaptive control, control surface damage