高空长航时飞机普遍具有大展弦比机翼 ,其气动弹性问题尤为突出 .考虑机翼结构的几何非线性对结构刚度的影响和机翼平面变形对非定常气动力的影响 ,采用准模态的思想进行大变形下的振动工程分析 ,并利用片条理论计算变形机翼的非定常气动力 ,然后进行颤振计算 .以某型飞机机翼为例的计算表明 ,随变形幅度增大 ,机翼的颤振速度有明显的下降 The aircraft with high aspect ratio generally has a large aspect ratio wing, and its aerodynamic elasticity is particularly prominent. Considering the influence of the geometric nonlinearity of the wing structure on the structural stiffness and the influence of plane deformation on the unsteady aerodynamics, State vibration theory analysis under large deformation, and the use of strip theory to calculate the unsteady aerodynamic deformation of the wing, and then flutter calculation to a certain type of aircraft wing as an example of the calculation shows that with the deformation amplitude increases , Wing flutter rate has dropped significantly