Publicação: Dynamical characterization of fully nonlinear, nonsmooth, stall fluttering airfoil systems
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Stall flutter is turning into a more likely condition to be encountered as the demand for increasingly more flexible wings grows for HALE-like aircraft. Due to the various nonlinearities involved that can lead to complex motion, the characterization of the dynamical behavior in the post-flutter condition becomes important. The dynamics of a pitch–plunge idealized HALE typical section with aerodynamic, structural and kinematic nonlinearities in the stall flutter regime was investigated using an aeroelastic state-space formulation which includes a modified Beddoes-Leishman dynamic stall model. The results reveal that period-doubling was possible without stall, but chaos arose at discontinuity-induced bifurcations due to dynamic stall. A parametric study has been conducted to assess the influence of key parameters in the development of bifurcations and chaos.
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Chaos, Discontinuity-induced bifurcations, Dynamic stall, HALE, Piecewise-smooth systems
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Inglês
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Nonlinear Dynamics, v. 107, n. 3, p. 2053-2074, 2022.
