RECONFIGURE project summary

Reconfiguration of Control in Flight for Integral Global Upset Recovery (RECONFIGURE)

Currently, commercial aircraft fault tolerant control (FTC) strategies in the flight control system (FCS) are based on fail-safe approaches whereby a nominal ("normal") control law is switched first to a robust ("alternate") solution and then if necessary to a "direct" law. Note that despite its name, the later law ensures a minimal level of stability augmentation independently of the type of abnormal event. The advantages of the current approach are the ease of design, analysis and certification.

Each control law is designed off-line for different levels of robustness and each includes a set of specific guidance and control (G&C) functions which assist the pilot during the flight. Some of these functions are switched off as the control law is switched from "normal" to "direct" and even though this state-of-practice is safe, it is also known to decrease the easiness of the piloting task and as functions get de-activated the use of automatic guidance (Auto-Pilot) or navigation systems (Flight Management) is prevented.

More advanced and less conservative FTC-FCS approaches have not been used due to mainly:

  1. A lack of demonstrated maturity of reconfigurable G&C methods for aircraft.
  2. A lack of research in the practical limitations arising from the interaction of reconfigurable G&C systems with the estimation and diagnostic systems that feed the first with the required information to reconfigure or adapt their behaviour.
  3. A definite gap in terms of the clearance problem, which is a precursor for FCS certification, for this type of G&C systems.

The previous standard FTC-FCS approach was programmatically pursued since aircraft makers seek above all safety and acceptable performance (Robust Stability). But for the future aircraft, it has been identified the need to change the design paradigm towards a performance-oriented one:

"Full-time & all-event availability of performance-optimized G&C functions"

This paradigm can be translated into the desire to extend the operability of the G&C functions designed to assist the pilot in keeping the flight safe and making the flight task easier and the mission optimal.

The main goal of RECONFIGURE is to investigate and develop aircraft guidance and control (G&C) technologies that facilitate the automated handling of off-nominal/abnormal events and optimize the aircraft status and flight. The automatism of the G&C will help alleviate the pilots' task and optimize performance by automatically reconfiguring the aircraft to its optimal flight condition. This automatism and optimization must be performed while maintaining the current aircraft safety levels.

Acronym: RECONFIGURE
Name: REconfiguration of CONtrol in Flight for Integral Global Upset REcovery
Contract number: FP7-AAT-2012-314544
Instrument: Collaborative - Small or medium-scale focused research project
Total Cost: 5.578.667 euros
EU Contribution: 3.971.108 euros
Call: FP7-AAT-2012-RTD-1
Starting Date: 1st January 2013
Duration: 42 months
Coordinator: Dr. Murray Kerr (Deimos Space SLU)
EC Officer: Christiane Bruynooghe