AIRCRAFT LATITUDINAL STATIC AEROELASTIC RESPONSE ANALYSIS USING NONLINEAR AERODYNAMIC DATA

The latitudinal static aeroelastic characteristics of an aircraft varying with angle of attack and vertical n-factors are analyzed based on nonlinear aerodynamic data, and compared with those based on linear aerodynamic data. Linear aerodynamic data means the aerodynamic forces linearly vary as the angle of attack, side slip angle and the deflective of control surfaces, nonlinear aerodynamic data vary nonlinearly as those angles. After the comparison, it can be concluded that: 1) the rigid and control derivatives of aileron are not influenced by angle of attack based on linear aerodynamic data, but both reduce with the increase of angle of attack based on nonlinear aerodynamic data; 2) whether based on linear aerodynamic data or on nonlinear aerodynamic data, the loads along the span of wing and vertical tail as well as the root loads of them vary in the same trend, just have the difference on numerical values.