Active and Passive Fault Tolerant Control for Winged Aircraft with Simultaneous Actuator and Sensor Faults

Abstract

Fault-tolerant control problems for the winged aircraft systems with simultaneous actuator and sensor faults are investigated via the T-S fuzzy observer and finite time integral sliding approach. Firstly, to ensure the fault amplitude to be estimated and the control input to be extracted explicitly, the T-S fuzzy model and Lie derivative are introduced to describe the winder aircraft longitudinal flight model respectively, and a more general sensor and actuator time-varying fault model is furthermore developed. Then an approach to decouple sensor faults from actuator faults is proposed. Sufficient conditions to achieve the sensor fault diagnosis and estimation using adaptive law are proposed. Moreover, based on the filtered sensor signals, a passive fault-tolerant control strategy using finite time integral sliding mode is proposed for winged aircraft with actuator faults. The obtained results suggest an effective way to maintain acceptable performance in the case that actuator and sensor faults occur simultaneously. Numerical simulations validate the effectiveness of the proposed approach.