Bifurcation analysis of the generic transport model for open-loop and closed-loop configurations

Stephen J Gill, Mark H Lowenberg, Luis Crespo, Simon A Neild, Bernd Krauskopf, Guilhem Puyou

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)


The paper evaluates the influence on off-nominal flight dynamics charac- teristics when closing the loop on an aircraft model with a feedback feedfor- ward control law. Of particular interest is the departure/upset behaviour of the closed-loop system near stall. The study vehicle is the NASA Generic Transport Model (GTM) and both fixed-gain and gain-scheduled versions of a LQR-PI controller are evaluated. The differences in effectiveness of the controllers are first demonstrated using time responses to fixed com- mands. Then, bifurcation analysis is used to characterize spiral and spin behaviour of the open-loop system, after which the influence of closing the loop on the system bifurcation diagram is shown. This yields an under- standing of the dynamics underlying both the open-loop and closed-loop system under off-nominal conditions, and hence a means of assessing the effects of varying the controller gains on the upset tendencies of the aircraft.

Original languageEnglish
Title of host publicationProceedings of the 2013 AIAA Atmospheric Flight Mechanics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages23
Publication statusPublished - Aug 2013
EventAIAA Atmospheric Flight Mechanics (AFM) Conference - Boston, MA, United States
Duration: 19 Aug 201322 Aug 2013


ConferenceAIAA Atmospheric Flight Mechanics (AFM) Conference
Country/TerritoryUnited States
CityBoston, MA


  • Aircraft dynamics
  • Airliner upset
  • Bifurcation analysis
  • Control laws


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