03.2 - Structural Analysis and Design, Structural Dynamics, Aeroelasticity
CHARACTERIZATION OF THE NONLINEAR AEROELASTIC BEHAVIOR OF AN AIRFOIL WITH FREEPLAY AND AERODYNAMIC NONLINEARITY
M. Candonč, R. Carreseč, H. Ogawač, P. Marzoccač; čRMIT University, Australia
Higher-order spectra analysis is utilised to analyse nonlinear flutter phenomena for a three-dimensional transonic wing model with pitch / plunge freeplay introduced at the root. The analysis utilises the bispectrum and trispectrum to identify the presence quadratically and cubically coupled frequencies and hence the presence of nonlinearities. The range of motion through which the root of the wing can rotate (pitch) and translate (plunge) is varied and correlations are drawn between the values of the higher-order spectra and the flutter boundary / limit cycle oscillation amplitude. This research is undertaken with the aim of generating a greater understanding of nonlinear flutter phenomena which is an essential milestone in building efficient and reliable nonlinear flutter prediction capabilities.