The effect of elastic couplings and material uncertainties on the flutter of composite high aspect ratio wings

In this paper, the stochastic aeroelastic stability analysis of a composite high aspect ratio wing with various elastic couplings is investigated. The consists rectangular spar-box made from materials. Due to its ratio, structure modelled using exact beam formulation, and aerodynamic loads acting on are simulated an unsteady lifting line theory. A cross section considered, effect effective parameters studied. First, baseline designed three different determined. These that affect design out-of-plane (flap)-twist, in-plane (lag)-twist extension-twist. Furthermore, uniformly distributed load assessed for layups. Finally, material uncertainties It observed type coupling has significant sensitivity flutter speed frequency due randomness properties. particular, behaviour lag-twist more sensitive than other two