Study On Lightweight-Oriented Structrue Optimization Of EMU Bogie Frame

After the sixth accelerating speed of national railway, high-speed rail has entered the stage of rapid development. A substantial increase in the speed of the trains has put forward higher requirements on each part. As the key component of the train, bogie frame structure should have higher reliability and lightweight structure, but there is a certain contradiction between the two aspects. So how to get a lightweight structure design with high reliability has an important significance.In order to realize the lightweight design of frame structure, choice of space structure optimization design, structural reliability assurance, material use efficiency and other key issues are studied in this paper. First of all, this paper drew up the principle of design space determination method based on the bogie frame design method and then formulated the space exploration process according to the above principle. Variable selection of the structural optimization is more reasonable by using the process. For the lack of constraints during the optimization design, this paper proposed to take structural stiffness, strength and frequencies as constraints of the structural optimization and realized a reasonable description of framework optimization constraints to ensure the reliability optimization results based on frame design principle. At last, in order to realize the uniform strength design requirement, this paper took variable cross-section design into the optimization design of frame structure. The welded plate was designed to be different thickness plate to improve the use of materials.This paper took a high-speed EMU power bogie frame as an example, realizing lightweight frame structure design under multiple constraints by using optimizing software Optistruct. By the comparison of related parameters for the optimized frame and the original, it is shown that at the same time of lightweight design, the overall stress distribution is more uniform, the material use is more fully and provides a method can be used for high speed EMU frame lightweight design.