Fault Tolerant Control Design for the Longitudinal Aircraft Dynamics using Quantitative Feedback Theory

Flight control laws of modern aircraft are scheduled with respect to flight point parameters. The loss of the air data measurement system implies inevitably the loss of relevant scheduling information. A strategy to design a fault tolerant longitudinal flight control system is proposed which can accommodate the total loss of the angle of attack and the calibrated airspeed measurements. In this scenario the described robust longitudinal control law is employed ensuring a control performance as close as possible to the nominal one. The controller is designed using quantitative feedback theory applied to the linear approximation of the longitudinal aircraft dynamics and is tested on a nonlinear high fidelity simulation model of a civil aircraft.

[1]  Isaac Horowitz,et al.  Quantitative feedback design theory : QFT , 1993 .

[2]  Guilhem Puyou,et al.  Clearance Benchmark for a Civil Aircraft , 2012 .

[3]  Philippe Mouyon,et al.  Adaptive LFT control of a transport aircraft on the lateral axis , 2012, 2012 IEEE International Conference on Control Applications.

[4]  Argyrios C. Zolotas,et al.  An optimisation algorithm for designing fixed-structure controllers using the QFT method , 2002, Proceedings. IEEE International Symposium on Computer Aided Control System Design.

[5]  Florian Holzapfel,et al.  Longitudinal Robust Controller for Excellent Handling Qualities Design of a General Aviation Aircraft using QFT , 2013 .

[6]  Andres Marcos,et al.  AIRBUS efforts towards advanced real-time Fault Diagnosis and Fault Tolerant Control , 2014 .

[7]  John C. Doyle.  Quantitative Feedback Theory (QFT) and Robust Control , 1986, 1986 American Control Conference.

[8]  M. Pachter,et al.  Full envelope flight control system design using QFT , 1994, Proceedings of 1994 American Control Conference - ACC '94.

[9]  Ian Postlethwaite,et al.  Multivariable Feedback Control: Analysis and Design , 1996 .

[10]  Daniel Ossmann,et al.  OPTIMIZATION-BASED TUNING OF LPV FAULT DETECTION FILTERS FOR CIVIL TRANSPORT AIRCRAFT , 2013 .

[11]  Steven J. Rasmussen,et al.  Quantitative feedback theory: fundamentals and applications: C. H. Houpis and S. J. Rasmussen; Marcel Dekker, New York, 1999, ISBN: 0-8247-7872-3 , 2001, Autom..

[12]  Hans-Dieter Joos,et al.  A Fault Diagnosis Based Reconfigurable Longitudinal Control System for Managing Loss of Air Data Sensors for a Civil Aircraft , 2014 .