Flutter Estimation for Low Speed Aircraft Wing Using Fully Coupled Fluid – Structure Interaction

Abstract

The aero elastic responses and the flutter condition of 3-D flexible aircraft wingwere estimated by developed fully coupled fluid-structure interaction approach. Theactual wing in this approach was represented by an equivalent plate .Equivalentplate model (structure model) based on assumed mode method was then combinedwith unsteady panel-discrete vortex method (aerodynamic model) to build relativelysimple aeroelastic model. This model could be used for estimation of fluttercondition of moderate to high aspect ratio and low sweep wings of aircraft flight atlow subsonic speeds. The obtained results from the present model are able toprediction the flutter condition of the actual wing at different angles of attack. Theincreasing in the angle of attack leads to reduce flutter speed and flutter frequency.