The establishment and experiment verification of the bending moment prediction formula of inflatable wing structure

Based on the principle of energy conservation, a bending moment prediction formula of the inflatable wing structure is established when the pure bending deformation occurs in the inflatable wing under a concentrated load at the tip of the wing. The formula shows that: the greater the load at the wing tip is, the longer the length of the wing is, and the larger the wing tip deforms, and they relate each other linearly. To verify the theoretical analysis results, an inflatable wing of NACA0012 airfoil tip static load experiment is conducted. The results show that: the error between the experimental data and the theoretical calculation is within 10%, and under the greater load and smaller pressure the Wing tip deformation is more obvious. The theoretical analysis results presented in this paper is well consistent with the experimental results.