Bifurcation-based shimmy analysis of landing gears using flexible multibody models

Book chapter (2019)

Authors

C. J.J. Beckers Eindhoven University of Technology
A. E. Öngüt Siemens PLM Software
G. Verbeek Fokker Landing Gear, Helmond
R. H.B. Fey Eindhoven University of Technology
Yves Lemmens Siemens PLM Software
N. van de Wouw Team Bart De Schutter - Mechanical, Maritime and Materials Engineering , University of Minnesota Twin Cities, Eindhoven University of Technology
Research Group
Team Bart De Schutter (Mechanical, Maritime and Materials Engineering) (TU Delft)
Bifurcation analysis Shimmy Flexible multibody dynamics Landing gear dynamics
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Published Date

2019

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Delft Center for Systems and Control

Research Group

Team Bart De Schutter

Abstract

Shimmy oscillations are undesired vibrations in aircraft landing gears. In this chapter, the onset of shimmy vibrations, marked by Hopf bifurcations, is investigated in the parameter space of high-fidelity, flexible multibody landing gear models. Such a bifurcation analysis is performed by combining the Virtual.Lab Motion multibody solver with the numerical continuation software AUTO. The resulting quasi-2-parameter bifurcation diagrams, involving aircraft velocity and normal load, are verified using conventional time-simulation methods and are shown to be computationally more efficient. A sensitivity study reveals the influence of design parameters, such as the shimmy damping coefficient, mechanical trail, and steering actuator stiffness, on the occurrence of shimmy.