Structure optimisation research for the upper bracket of automobile front-end frame based on the compromise programming method

At present, the market for automobile lightweight is mainly based on plastic instead of steel, while the stiffness and strength of plastic are usually lower than that of steel, so it is difficult to ensure its stiffness. In this paper, the upper bracket of automobile front-end frame is taken as the research object. The initial finite element model of the upper bracket is established by CATIA and HyperMesh software. The single-objective topology optimization is carried out by defining the load of each working condition, and the weight value of each working condition is determined. The mathematical model is established by compromise programming method for multi-objective topology optimization. According to the optimization results and combined with the actual injection molding manufacturing, the final product is designed. The mechanical performance test of the upper bracket of automobile front-end frame of the optimized design is carried out, and the results of each test are within the qualified range, which verifies the feasibility of the mathematical model established in this paper.