Nonlinear and linear aeroelastic modeling and experimental analysis of flexible wings for wind tunnel flutter tests

Abstract

© 2016 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.Nonlinear aeroelastic phenomena is continuously investigate in aeronautical researches. The nonlinearity nature, for these cases, could be aerodynamic, such as dynamic stall or shock waves or structural, for example, free play or large displacements due to high aspect ratio and high flexibility. This work will investigate a very flexible wing with high aspect ratio subjected to unsteady flow. A flutter analysis is proceeded in order to evaluate the error between the computational result and the experiment. Since the linear flutter theory consider small displacements, it is expected a nonlinear phenomena. In this case, the experiment time series is analyzed in order to understand this nonlinearity and a 0-1 test is performed to evaluate if the system has chaotic behavior.