An investigation into the effect of freeplay on the nonlinear aeroelastic behavior of a wing via higher-order spectra

Michael Candon, Hideaki Ogawa, Robert Carrese, Pier Marzocca

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Higher-order spectra analysis is used to analyze the nonlinear flutter characteristics of the AGARD 445.6 wing benchmark model, modified to include freeplay structural nonlinearities in pitch and plunge at the wing root. High-fidelity coupled CFD-CSD fluid-structure interaction simulations are conducted and bispectral densities are computed from selected aeroelastic wing dynamic response signals to identify the presence of quadratic nonlinearities within the available time histories. Initially, various freeplay conditions are investigated, before focusing on the intensity of nonlinear behavior at various wing spanwise stations. The considerable effect of freeplay is clearly demonstrated as the wing enters a bounded limit cycle oscillation (LCO) with amplitudes several orders of magnitude larger than that of the case without freeplay. Nonlinear coupling is demonstrated via self-interaction of the LCO frequency and coupling between the LCO frequency and the first torsional mode, this is shown to be strongest at the root where the pitch / plunge mechanism is installed and torsion is most prominent, dissipating spanwise from the pitch / plunge mechanism as the torsional motion becomes less significant. Modal analysis, alongside analysis of the leading-trailing edge phase change and wing deformation shapes supports the findings of the HOS, generating understanding of the underlying physical attributes leading to the observed nonlinear aeroelastic phenomena.

Original languageEnglish
Title of host publication26th International Conference on Adaptive Structures and Technologies, ICAST 2015
PublisherInternational Conference on Adaptive Structures and Technologies
ISBN (Electronic)9781510821897
Publication statusPublished - Jan 1 2015
Externally publishedYes
Event26th International Conference on Adaptive Structures and Technologies, ICAST 2015 - Kobe, Japan
Duration: Oct 14 2015Oct 16 2015

Publication series

Name26th International Conference on Adaptive Structures and Technologies, ICAST 2015

Conference

Conference26th International Conference on Adaptive Structures and Technologies, ICAST 2015
CountryJapan
CityKobe
Period10/14/1510/16/15

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Building and Construction
  • Civil and Structural Engineering
  • Mechanics of Materials
  • Electrical and Electronic Engineering

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