Abstract
Results generated from an aeroelastic model that combines a nonlinear structural dynamic model based on MARC with an approximate aerodynamic model that incorporates leading edge vortices and a wake model are presented. The aerodynamic model, used in our earlier studies, is extended to forward flight, and the effect of fluid viscosity is incorporated into the formulation in a partial manner. Results presented describe aerodynamic and aeroelastic studies conducted on airfoils and flapping wings in hover and forward flight. For the rigid cases considered, the approximate model shows reasonable agreement with CFD based results and predicts the trends accurately. The aeroelastic results presented indicate that wing flexibility has beneficial effects in both hover and forward flight. Comparisons show that aerodynamic loads are comparable to inertia loads for the cases considered.
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