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Acta Mechanica

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26-04-2021 | Original Paper

Nonlinear energy sink to enhance the landing gear shimmy performance

Authors: Leonardo Sanches, Thiago A. M. Guimarães, Flávio D. Marques

Published in: Acta Mechanica | Issue 7/2021

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Abstract

The shimmy phenomenon is a significant concern in aircraft landing gear dynamics. The prediction of the shimmy instability is an essential issue in landing gear design to develop a passive or active suppression method. This work investigates the application of the nonlinear energy sink (NES) concept to mitigate the effects of shimmy in landing gears. The NES concept has been used in recent research on mechanical vibrations. It comprises a passive target energy transfer method that refers to a one-way energy transfer from a primary to a nonlinear subsystem. The landing gear model is based on torsional displacement coupled with the tyre classical elastic string analogy model. The NES device connects to the wheel shaft, and it comprises a mass, a linear damper, and a pure cubic spring. The numerical integration in time was used to assess the shimmy onset speed and the post-shimmy limit cycle oscillations. A parametric analysis of the landing gear nonlinear dynamics without the NES is presented. The design space of possible NES parameters is given, obeying design constraints, and inspected to assess adequate NES designs. The best NES samples are included in the landing gear dynamics to study their influence. Results have shown that the NES can adequately expand the operational speed range for no shimmy and lead to lower LCO amplitudes in the post-shimmy for a reasonable range of speeds. The NES concept’s successful employment for the landing gear dynamics suggests an enormous potential form of passive shimmy control.

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Title: Nonlinear energy sink to enhance the landing gear shimmy performance
Authors: Leonardo Sanches
Thiago A. M. Guimarães
Flávio D. Marques
Publication date: 26-04-2021
Publisher: Springer Vienna
Published in: Acta Mechanica / Issue 7/2021
Print ISSN: 0001-5970
Electronic ISSN: 1619-6937
DOI: https://doi.org/10.1007/s00707-021-02985-8

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Nonlinear energy sink to enhance the landing gear shimmy performance

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