Optimization design of the wing structure based on variable density method and feasible direction method

In order to realize the lightweight design of the wing structure, the internal structure of the wing was taken as the research object. Topology optimization took structural compliance as the objective function, and size optimization took mass as the objective function. The variable density method based on the SIMP stiffness interpolation model was used to optimize the structural layout of the wing. On this basis, the finite element model (FEM)of shell-rod structure was established, and the feasible direction method (MFD) was used to optimize the wing structure size. The mass of structure is reduced by 28.7% compared with the initial structure, the optimal design scheme of the wing is obtained.