面向InSAR的空气扰动影响机翼挠曲变形建模

For the problem of multi-node InSAR wing deflection deformation error, a method based on mechanism modeling integrated parameter identification is proposed for the layered modeling of wing deflection deformation induced by air disturbance. First, this model takes atmospheric turbulence as the main air disturbance in the InSAR imaging working section, and based on Dryden model, it is analyzed that the working height and speed of the aircraft are the main factors affecting atmospheric turbulence. Therefore, the modeling of wing deformation affected by atmospheric turbulence is transformed to the layered modeling of wing deformation under different working conditions (height change, velocity change). Second, the wing deformation mechanism model is established based on the combination of the aerodynamic theory and the cantilever beam deformation theory. The parameters of the model are identified by the experimental data obtained from the simulation analysis of computational fluid dynamics and computational structural mechanics. Finally, the simulation experiments show that, calculated by both the proposed method and the mature modal superposition principle, the lateral displacement error is better than 0.6 mm (relative error 0.3%) and the axial displacement error is better than 0.015 mm (relative error 0.2%). In addition, based on the distributed fiber Bragg grating measurement system of wing structure built in the laboratory and the principle of modal superposition, the deformation is calculated to verify the proposed method, the lateral displacement error is better than 0.3 mm (relative error 1%) and the axial relative error is better than 0.06 mm (relative error 3%).