INFLUENCE ON THE FLUTTER BEHAVIOR OF PRE-STRESSED WING STRUCTURES UNDER AERODYNAMIC LOADING

Modern wing designs exhibit a significant increase in wing flexibility through slenderer wings in combination with an extensive lightweight structural design. Especially wing flutter becomes increasingly important with higher elasticity. In addition, wings with increased elasticity show a significantly higher deflection between jig- and flight-shape. For this purpose, the effects of changes in stiffness, mass matrix and different lift distributions between jig and 1g trimmed cruise condition are analyzed with regard to the flutter prediction according to the p-k method. The structural and aerodynamic effects are exemplary compared using a generic composite higher aspect ratio swept wing, where the most significant influence could be identified by the simple geometrical change from jig- to flight-shape.     «

Modern wing designs exhibit a significant increase in wing flexibility through slenderer wings in combination with an extensive lightweight structural design. Especially wing flutter becomes increasingly important with higher elasticity. In addition, wings with increased elasticity show a significantly higher deflection between jig- and flight-shape. For this purpose, the effects of changes in stiffness, mass matrix and different lift distributions between jig and 1g trimmed cruise condition are...     »