Variable density lattice structure design method based on BESO

The invention provides a BESO-based variable density lattice structure design method, and relates to the technical field of lattice structure design. The method comprises the following steps: firstly, establishing an initial three-dimensional structure finite element model of a solid structure to be optimized, and setting an initial design domain and optimization parameters of an optimization part; dividing finite element grids for the initial three-dimensional structure, and applying boundary conditions and load conditions; calculating an evolution step length of a design variable in an optimization process; calculating the sensitivity and objective function of each grid unit, and performing sensitivity filtering; and finally, adding and deleting the grid units according to the evolution step length of the design variable to obtain an optimal variable density lattice structure. According to the method, the existing BESO is optimized, the accuracy degree of sensitivity calculation data of the BESO is improved