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Acta Mechanica Sinica

, Volume 29, Issue 4, pp 583–592 | Cite as

Analysis of limit cycle oscillations of a typical airfoil section with freeplay

  • Si-Jin ZhangEmail author
  • Gui-Lin Wen
  • Fan Peng
  • Zi-Qiang Liu
Research Paper

Abstract

A typical airfoil section system with freeplay is investigated in the paper. The classic quasi-steady flow model is applied to calculate the aerodynamics, and a piecewise-stiffness model is adopted to characterize the nonlinearity of the airfoil section’s freeplay. There are two critical speeds in the system, i.e., a lower critical speed, above which the system might generate limit cycle oscillation, and an upper critical one, above which the system will flutter. Then a Poincaré map is constructed for the limit cycle oscillations by using piecewise-linear solutions with and without contact in the system. Through analysis of the Poincaré map, a series of equations which can determine the frequencies of period-1 limit cycle oscillations at any flight velocity are derived. Finally, these analytic results are compared to the results of numerical simulations, and a good agreement is found. The effects of freeplay value and contact stiffness ratio on the limit cycle oscillation are also analyzed through numerical simulations of the original system. Moreover, there exist multi-periods limit cycle oscillations and even complicated “chaotic” oscillations may occur, which are usually found in smooth nonlinear dynamic systems.

Keywords

Freeplay nonlinearity Typical airfoil section Limit cycle oscillations Poincaré map 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Si-Jin Zhang
    • 1
    Email author
  • Gui-Lin Wen
    • 1
  • Fan Peng
    • 1
  • Zi-Qiang Liu
    • 2
  1. 1.School of Mechanical and Vehicle EngineeringHunan UniversityChangshaChina
  2. 2.Institute of Astronautic Aero-Dynamics and TechnologyBeijingChina

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