OPERATIONAL PARAMETER STUDY OF AIRCRAFT GROUND DYNAMICS

Andrew J Rankin, Bernd Krauskopf, Mark Lowenberg, Etienne Coetzee

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

Abstract

The dynamics of passenger aircraft on the ground are influenced by the nonlinear characteristics of several components, including geometric nonlinearities, the aerodynamics and interactions at the tyre-ground interface. We present a fully parametrised mathematical model of a typical passenger aircraft that includes all relevant nonlinear effects. The full equations of motion are derived from first principles in terms of forces and moments acting on a rigid airframe, and they include implementations of the local models of individual components. The overall model has been developed from and validated against an existing industry-tested SimMechanics model.

The key advantage of the mathematical model is that it allows for comprehensive studies of solutions and their stability with methods from dynamical systems theory, in particular, the powerful tool of numerical continuation. As a concrete example, we present a bifurcation study of how fixed-radius turning solutions depend on the aircraft's steering angle and centre of gravity position. These results are represented in a compact form as surfaces of solutions, on which we identify regions of stable turning and regions of laterally unstable solutions. The boundaries between these regions are computed directly and they allow us to determine ranges of parameter values for safe operation. The robustness of these results under the variation of an additional parameter, specifically, the engine thrust is investigated. Qualitative changes in the structure of the solutions are identified and explained. Overall our results give new insight into the possible turning dynamics of the aircraft in dependence on three parameters of operational relevance.

Original languageEnglish
Title of host publicationPROCEEDINGS OF ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, VOL 4, PTS A-C
Place of PublicationNEW YORK
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages303-310
Number of pages8
ISBN (Print)978-0-7918-4901-9
Publication statusPublished - 2010
Event7th International Conference on Multibody Systems, Nonlinear Dynamics and Control - San Diego
Duration: 30 Aug 20092 Sep 2009

Conference

Conference7th International Conference on Multibody Systems, Nonlinear Dynamics and Control
CitySan Diego
Period30/08/092/09/09

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