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Bifurcation analysis of an aeroelastic system with concentrated nonlinearities

Abdelkefi, Abdessattar; Vasconcellos, Rui Marcos Grombone De; Marques, Flavio Donizeti; Hajj, Muhammad R. Universidade De São Paulo

NONLINEAR DYNAMICS, DORDRECHT, v. 69, n. 41306, pp. 57-70, JUL, 2012

SPRINGER; DORDRECHT 2012

Acesso online

  • Título:
    Bifurcation analysis of an aeroelastic system with concentrated nonlinearities
  • Autor: Abdelkefi, Abdessattar; Vasconcellos, Rui Marcos Grombone De; Marques, Flavio Donizeti; Hajj, Muhammad R.
  • Universidade De São Paulo
  • Assuntos: Nonlinear Aeroelasticity; Quasi-Steady; Duhamel Formulation; Normal Form; Engineering; Mechanical; Mechanics
  • É parte de: NONLINEAR DYNAMICS, DORDRECHT, v. 69, n. 41306, pp. 57-70, JUL, 2012
  • Descrição: Analytical and numerical analyses of the nonlinear response of a three-degree-of-freedom nonlinear aeroelastic system are performed. Particularly, the effects of concentrated structural nonlinearities on the different motions are determined. The concentrated nonlinearities are introduced in the pitch, plunge, and flap springs by adding cubic stiffness in each of them. Quasi-steady approximation and the Duhamel formulation are used to model the aerodynamic loads. Using the quasi-steady approach, we derive the normal form of the Hopf bifurcation associated with the system's instability. Using the nonlinear form, three configurations including supercritical and subcritical aeroelastic systems are defined and analyzed numerically. The characteristics of these different configurations in terms of stability and motions are evaluated. The usefulness of the two aerodynamic formulations in the prediction of the different motions beyond the bifurcation is discussed.
    Sao Paulo State Research Agency, FAPESP, Brazil
    Sao Paulo State Research Agency, FAPESP, Brazil [2007/08459-1]
    Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil [0205109]
    Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil
  • DOI: 10.1007/s11071-011-0245-6
  • Títulos relacionados: NONLINEAR DYNAMICS
  • Editor: SPRINGER; DORDRECHT
  • Data de publicação: 2012
  • Idioma: Inglês

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