Investigations on the interactions between structural and aerodynamic nonlinearities and unsteadiness for aeroelastic systems

A nonlinear analysis is performed on a two-degree-of-freedom wing-based system. Structural nonlinearities are introduced in the pitch degree of freedom when considering two different forms of the aerodynamic loads. Comparisons between quasi-steady and unsteady aerodynamic representations are investigated and discussed including stall effects. The nonlinear aeroelastic response is carried out in the presence of quadratic and cubic nonlinearities...