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 language | English |
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Pages (from-to) | 138-148 |
Number of pages | 11 |
Journal | Journal of Fluids and Structures |
Volume | 85 |
DOIs | |
State | Published - Feb 2019 |
Keywords
- Aeroelasticity
- Flutter
- Kapitza's pendulum
- Parametric excitation
All Science Journal Classification (ASJC) codes
- Mechanical Engineering