Fault Diagnosis and Reconfigurable Control for Commercial Aircraft with Multiple Faults and Actuator Saturation

Yishi Liu,Jianwei Liu,Sheng Hong,Enrico Zio

doi:10.3390/aerospace8040108

Abstract

Active fault-tolerant control systems perform fault diagnosis and reconfigurable control. There is a bidirectional uncertainty between them, and an integrated scheme is proposed here to account for that. The system considers both actuator and sensor faults, as well as the external disturbance. The diagnostic module is designed using an unknown input observer, and the controller is constructed on the basis of an adaptive method. The integrated strategy is presented, and the stability of the overall system is analyzed. Moreover, different kinds of anti-windup techniques are utilized to modify the original controllers, because of the different controller structures. A simulation of the integrated anti-windup fault-tolerant control method is demonstrated using a numerical model of Boeing 747. The results show that it can guarantee the stability of the post-fault aircraft and increase the control performance for the overall faulty system.

Highlights

Introduction and Matteo Davide LorenzoThe electrical flight control system (EFCS) is the industrial standard for commercial aircraft and has been widely used in the aviation sector, because it can improve the safety and performance of aircraft [1]
Fault-tolerant control (FTC) has gained importance because it can deal with system faults automatically, make the system stable, and regain the performance of faulty aircraft
FTC consists of passive fault-tolerant control (PFTC) and active fault-tolerant control (AFTC) [4]

Summary

Introduction and Matteo Davide Lorenzo

The electrical flight control system (EFCS) is the industrial standard for commercial aircraft and has been widely used in the aviation sector, because it can improve the safety and performance of aircraft [1]. Based on the designed estimator, a controller is reconfigured using a modified fuzzy dynamic output feedback method to address faults (actuator or sensor) and mismatched input disturbances. The authors of [16] presented an integrated strategy of AFTC where the PD extended state observer was designed to estimate system states and actuator/sensor faults, and the control law was designed using a modified LMI-based L2 robustness procedure. Different from the works in [7,8,9,10,11,12,13], an integrated reconfigurable control strategy is presented to cancel the pairing between estimator and controller, and to improve the performance of the controller. Two common actuator constraints (magnitude and rate) are considered to design the anti-windup FTC scheme using different techniques. The following notations will be used throughout the paper: I signifies an identity matrix, diag{·} signifies the diagonal matrix, and (·)† signifies the pseudo-inverse

System Modeling

Integrated Reconfigurable Controller Design

Anti-Windup Mechanisms

Application Example

Conclusions