A new decentralized retrofit adaptive fault-tolerant flight control design

摘要

In this paper, we develop a new decentralized retrofit adaptive fault-tolerant control design for a class of nonlinear models arising in flight control. The proposed adaptive fault-tolerant controller is designed to accommodate loss-of-effectiveness (LoE) failures in flight control actuators and achieve accurate estimation of failure-related parameters. The design is based on local estimation of LoE parameters and generation of local retrofit control signals to accommodate the failures. Using state-dependent closed-loop estimation errors, we show the overall system to be stable and demonstrate the tracking error to converge to zero asymptotically for any combination of actuator failures. Through computer simulation of F/A-18 aircraft under actuator LoE failures, the proposed approach is also shown to achieve better parameter estimation' performance compared to the fully centralized design and the design employing local observers and a centralized adaptive controller.