A lightweight hierarchical optimization design method for automobile structure

Abstract

The invention relates to a lightweight hierarchical optimization design method for an automobile structure. First, a finite element model of a complete vehicle is built, and then a first-level optimization and a second-level optimization are carried out based on the finite element model of the complete vehicle; the first-level optimization first constructs a soft constraint model, Then carry out topology optimization analysis, optimize the material distribution of the research object, then optimize the structural shape of the research object, and then find out the area where the strain energy is concentrated in the soft constraint model, and optimize the area where the strain energy is concentrated; the second level optimization Firstly, the finite element model of the whole vehicle is taken as the analysis object, and the simulation analysis is performed, and then the transfer function between the control factor and the output performance is established, and then based on the transfer function, the optimization of the control factor is completed, and the optimal solution is obtained. The light-weight hierarchical optimization design method of the automobile structure proposed by the present invention can reduce the design redundancy or insufficient performance by moderately reducing the weight; it can fully correlate and improve the performance of the whole vehicle, and the structure optimization effect is more obvious.

Description

technical field [0001] The invention relates to the technical field of lightweight automobiles, in particular to a method for grading and optimizing the lightweight structure of automobiles. Background technique [0002] Lightweight automobiles, that is, on the premise of ensuring the relevant performance, make the weight the lightest, thereby reducing the overall vehicle weight and fuel consumption. There are three main ways to achieve light weight: 1. Lightweight structure, that is, adopting a more reasonable structural design, which is also a more economical and practical way; 2. Lightweight material, that is, using lightweight metals or non-metals with high strength and low density Materials; 3. Lightweight process, that is, through more advanced process technology. [0003] The existing lightweight technologies for automobile structures are all based on the modal, stiffness and other properties under the “hard constraint state” (completely locked or completely released...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing lightweight technology of automobile structure cannot effectively correlate and reflect the performance of the whole vehicle, resulting in design redundancy or insufficient performance, the present invention proposes a hierarchical optimization design method for lightweight automobile structure, which can realize forward development of lightweight automobile structure , and can take into account the vehicle performance and quality

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