Lattice structure unit cell density distribution optimization method

Abstract

The invention discloses a lattice structure unit cell density distribution optimization method, and the method comprises the following steps of: by analyzing geometric, functional and working condition characteristics of a lattice structure, filling internal unit cells of the lattice structure, and establishing a solid model and a finite element model of the lattice structure; extracting a main force transmission path of the dot matrix structure entity model by adopting a force transmission path visualization method; calculating the shortest distance between the center point of each unit cell and the main force transmission path, optimizing the size parameters of the unit cells by taking the length of the distance as a judgment criterion, constructing a mathematical model of unit cell size optimization design, and obtaining a new unit cell density distribution rule in the lattice structure through calculation. According to the method, the density distribution of the unit cells in the structure is guided by adopting the force transmission path, explicit mechanical guidance can be provided for designers, the proposed optimization method does not need to establish a complex mathematical model, and reference significance can be provided for design and optimization of other bearing structures.

Description

technical field [0001] The invention belongs to the field of lattice structure and additive manufacturing, and particularly relates to a method for optimizing the density distribution of lattice structure cells. Background technique [0002] In the context of energy saving and emission reduction, the lightweight requirements of mechanical equipment in the fields of automobiles, aerospace, and aviation are getting higher and higher. The structural features of high stiffness, high strength, and low weight have become the goals pursued by structural engineers; lattice structures as A new type of lightweight and high-strength structure, composed of regular porous unit cells, has excellent mechanical properties such as ultra-light, high porosity, high toughness, high specific strength, high specific stiffness, and high energy absorption. It has been used in aerospace, It has been applied in industries such as medical equipment. [0003] The internal unit cells of the traditional...

AI Technical Summary

Problems solved by technology

[0003] The internal unit cells of the traditional lattice structure are uniformly arranged, but studies have shown that under the same load, the variable density lattice structure has higher mechanical properties and lighter weight than the equal density lattice structure; the existing variable density The design of the lattice structure is mainly based on topology optimization. By identifying the optimization result and converting it into a density value, the variable density distribution of the unit cell is realized based on iterative search; however, the unit cell size parameters in the lattice structure are many and mutually coupled. , the numerical instability of the topology optimization method itself can easily lead to problems such as grid dependence and local extremum in the optimization results, which will inevitably affect the optimization effect, and the existing structural optimization methods based on numerical analysis are essentially black-box model optimization. It is difficult to provide designers with reasonable mechanical guidance during unit cell density optimization; therefore, it is necessary to explore new methods for optimizing the unit cell density distribution of lattice structures

Images