Sensitivity of the Generic Transport Model upset dynamics to time delay

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)

Abstract

Bifurcation analysis has previously been applied to the NASA Generic Transport Model (GTM) to provide insight into open-loop upset dynamics and also the impact on and sensitivity of such behaviour to closing the loop with a flight controller. However, these studies have not considered time delay in the system: this arises in all feedback controllers and has specific relevance when remotely piloting a vehicle such as the NASA AirSTAR GTM with ground-based controllers. Developments in the AirSTAR programme, in which a sub-scale generic airliner model will be tested for loss-of-control conditions over long ranges, raise the prospect of increased adverse effects of time delay relative to previous testing. This paper utilises bifurcation analysis, supplemented with time histories, on the GTM numerical model with a LQR-PI controller to evaluate the sensitivity of the closed-loop system stability to time delay. In this paper, the impact of time delays in both a fixed-gain and a gain-scheduled version of the controller is presented in terms of stability of nominal and off-nominal solutions.
Original languageEnglish
Title of host publicationAIAA Guidance, Navigation, and Control Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages20
ISBN (Print)9781600869624
DOIs
Publication statusPublished - Jan 2014
EventAIAA Guidance, Navigation, and Control Conference 2014 - SciTech Forum and Exposition 2014 - National Harbor, MD, United Kingdom
Duration: 13 Jan 201417 Jan 2014

Conference

ConferenceAIAA Guidance, Navigation, and Control Conference 2014 - SciTech Forum and Exposition 2014
CountryUnited Kingdom
CityNational Harbor, MD
Period13/01/1417/01/14

Keywords

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

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