Nonlinear energy sink to enhance the landing gear shimmy performance

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...

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Bibliographic Details
Published in:Acta mechanica 2021-07, Vol.232 (7), p.2605-2622
Main Authors: Sanches, Leonardo, Guimarães, Thiago A. M., Marques, Flávio D.
Format: Article
Language:English
Subjects:
Aircraft accidents & safety
Aircraft landing
Analysis
Classical and Continuum Physics
Control
Dynamic stability
Dynamical Systems
Energy transfer
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Heat and Mass Transfer
Landing gear
Landing of aircraft
Limit cycle oscillations
Nonlinear dynamics
Numerical integration
Original Paper
Parametric analysis
Solid Mechanics
Theoretical and Applied Mechanics
Vibration
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Summary: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.
ISSN:0001-5970
1619-6937
DOI:10.1007/s00707-021-02985-8