This chapter analyses and discusses an active fault tolerant control system for avionic applications. The approach applies to an aircraft longitudinal autopilot in the presence of faults affecting the system actuators. The key point of the developed fault tolerant control scheme consists of its active feature, since the fault diagnosis module provides a robust and reliable estimation of the fault signals, which are thus compensated. The design technique, relying on a nonlinear geometric approach, i.e. a differential geometry tool, allows to achieve adaptive filters, which provides both disturbance decoupled fault estimates and fault isolation features. The chapter also shows how these fault estimates are thus exploited for control accommodation. In particular, by means of this nonlinear geometric approach, it is possible to obtain fault reconstructions decoupled from the wind components of the considered aircraft application. It is shown how this solution provides very good robustness characteristics and performances to the overall system. Finally, the effectiveness of the considered scheme is analysed by means of an high fidelity flight simulator, in different conditions and in the presence of actuator faults, turbulence, measurement noise, and modelling errors.

Fault diagnosis and fault-tolerant control techniques for aircraft systems

Simani S.
Ultimo
Writing – Review & Editing
2020

Abstract

This chapter analyses and discusses an active fault tolerant control system for avionic applications. The approach applies to an aircraft longitudinal autopilot in the presence of faults affecting the system actuators. The key point of the developed fault tolerant control scheme consists of its active feature, since the fault diagnosis module provides a robust and reliable estimation of the fault signals, which are thus compensated. The design technique, relying on a nonlinear geometric approach, i.e. a differential geometry tool, allows to achieve adaptive filters, which provides both disturbance decoupled fault estimates and fault isolation features. The chapter also shows how these fault estimates are thus exploited for control accommodation. In particular, by means of this nonlinear geometric approach, it is possible to obtain fault reconstructions decoupled from the wind components of the considered aircraft application. It is shown how this solution provides very good robustness characteristics and performances to the overall system. Finally, the effectiveness of the considered scheme is analysed by means of an high fidelity flight simulator, in different conditions and in the presence of actuator faults, turbulence, measurement noise, and modelling errors.
2020
9781785618307
9781785618314
Active fault-tolerant control system; Active feature; Actuator faults; Actuators; Adaptive filters; Aerospace simulation; Aircraft; Aircraft control; Aircraft longitudinal autopilot; Aircraft systems; Avionic applications; Avionics; Chapter analyses; Considered aircraft application; Control accommodation; Control system synthesis; Design technique; Developed ftc scheme; Disturbance-decoupled fault estimates; Fault diagnosis; Fault diagnosis module; Fault isolation features; Fault reconstructions; Fault signals; Fault tolerance; Fault-tolerant control techniques; Nlga; Nonlinear control systems; Nonlinear geometric approach; Robust control; Robust estimation; System actuators;
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2456425
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