The investigation of aeroelastic effects on the elastic wave propagation and radiated noise of periodic structures

In classic aeroelastic and flutter studies the natural modes of the structures are analysed with and without flow coupling. The study of travelling elastic waves in presence of flow, or travelling flutter waves, even though being suggested in many works in the literature, never had a deep and practical application. Here, within a finite element framework, a wave-based approach is coupled with supersonic and subsonic aerodynamic theories to analyse the effect of one-sided mean flow on the structural dispersion curves. Different polynomial eigenvalue problems arise, depending on the aeroelastic model used, as for the observed effects on the elastic wave propagation. The method is here applied both on homogeneous and complex-shaped periodic cells. The sound transmission is also computed and compared to the case in which aeroelastic effects are included.