Nonlinear Stall Flutter and Divergence Analysis of Cantilevered Graphite/Epox...

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Nonlinear Stall Flutter and Divergence Analysis of Cantilevered
Graphite/Epoxy Wings
Peter Dunn* and John Dugundjit
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
The nonlinear, stalled, aeroelastic behavior of rectangular, graphite/epoxy, cantilevered wings with varying
amount of bending-torsion stiffness coupling is investigated. A nonlinear aeroelastic analysis is developed using
the nonlinear, stalled ONERA aerodynamic model initially presented by Tran and Petot. Nonlinear flutter
calculations are carried out using Fourier analysis to extract the harmonics from the ONERA aerodynamics, then
a harmonic balance method and a Newton-Raphson solver are applied to the resulting nonlinear, Rayleigh-Ritz
aeroelastic formulation. Test wings were constructed and subjected to wind-tunnel tests for comparison against
the developed analysis. Wind-tunnel tests show reasonable agreement between theory and experiment for static
deflections, for linear flutter and divergence, and for nonlinear, torsional stall flutter and bending stall flutter
limit cycles. The current nonlinear analysis shows a transition from divergence to bending stall flutter, which
linear analyses are unable to predict

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