Forced vibrations as a mechanism to suppress flutter—An aeroelastic Kapitza's pendulum

Ofek Peretz, Amir D. Gat

Research output: Contribution to journalArticlepeer-review

Abstract

Inspired by Kapitza's inverted pendulum, forced vibrations are suggested as a mechanism to suppress aeroelastic flutter. We examine high-frequency small-amplitude vibrations (e.g. by an internal oscillating mass) applied on a 2D airfoil, yielding forced periodic excitation in the gyration-radius. Under such excitation, the aeroelastic dynamics involve time-periodic system of two Hill-type ODEs. Harmonic balance is applied, along with Floquet theory approach, in order to find approximated transition curves between stable and unstable regions. The transition curves are obtained from the relevant Hill's determinants, and are validated by numerical calculations. Structural 3D effects are examined by the aeroelastic strip approach for excitation in a section or the entire wing. The results indicate that rapid small-amplitude oscillations can significantly increase the maximal stable velocity in realistic flight conditions.

Original languageEnglish
Pages (from-to)138-148
Number of pages11
JournalJournal of Fluids and Structures
Volume85
DOIs
StatePublished - Feb 2019

Keywords

  • Aeroelasticity
  • Flutter
  • Kapitza's pendulum
  • Parametric excitation

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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