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Experimental and Numerical Aeroelastic Analysis of Airfoil-Aileron System with Nonlinear Energy Sink

  • Claudia Fernandez-Escudero
  • Miguel Gagnon
  • Eric Laurendeau
  • Sebastien Prothin
  • Annie Ross
  • Guilhem Michon
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Recent studies on nonlinear passive absorbers present high control efficiency for broadband frequency range with low added mass. This work presents a configuration of an airfoil typical section where the flap is considered as a Nonlinear Energy Sink (NES), which adds zero mass and has a cubic stiffness. An aeroelastic test-bench was created and characterized for linear and nonlinear structural configurations and tested in a subsonic wind-tunnel experimental campaign. The strongly nonlinear hardening stiffness is obtained by using linear springs and geometric nonlinearities. For the nonlinear tests, several Limit Cycle Oscillation (LCO) and subcritical and supercritical Hopf bifurcations were observed. Numerical analysis was also carried out for both linear and nonlinear cases using: Unsteady Vortex Lattice Method (UVLM) and Theodorsen theory (both low fidelity), Euler (medium fidelity) and Reynolds-Averaged Navier Stokes (high fidelity) methods. The numerical methods present good agreement, within the limits of each approach, and correspond with the experimental data. Using the NES, a gain of flutter speed is reached compared to the linear flap restoring force configuration.

Keywords

Aeroelasticity Unsteady aerodynamics Flutter LCO Nonlinear dynamics 

Notes

Acknowledgements

The authors would like to acknowledge the Natural Sciences and Engineering Research Council of Canada and ISAE-Supaero for the funding. The work benefited from the advices of Simon Bourgault-Côté and Matthieu Parenteau regarding the software NSCODE and UVLM, respectively.

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Copyright information

© Society for Experimental Mechanics, Inc. 2020

Authors and Affiliations

  • Claudia Fernandez-Escudero
    • 1
    • 2
  • Miguel Gagnon
    • 2
  • Eric Laurendeau
    • 2
  • Sebastien Prothin
    • 1
  • Annie Ross
    • 2
  • Guilhem Michon
    • 3
  1. 1.ISAE-SupaeroToulouseFrance
  2. 2.Polytéchnique MontrealMontrealCanada
  3. 3.Université de Toulouse, ICA, CNRS, ISAE-SupaeroToulouseFrance

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