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.
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Acknowledgements
The work in this chapter was supported by Siemens PLM Software and Fokker Landing Gear. Their cooperation is gratefully acknowledged.
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Beckers, C.J.J., Öngüt, A.E., Verbeek, G., Fey, R.H.B., Lemmens, Y., van de Wouw, N. (2019). Bifurcation-Based Shimmy Analysis of Landing Gears Using Flexible Multibody Models. In: Jauregui, J. (eds) Nonlinear Structural Dynamics and Damping. Mechanisms and Machine Science, vol 69. Springer, Cham. https://doi.org/10.1007/978-3-030-13317-7_7
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