Material-structure integrated optimization method for steel-aluminum hybrid frame

Abstract

The invention discloses a material-structure integrated optimization method for a steel-aluminum hybrid frame, which comprises the following steps of: establishing a three-dimensional model and a finite element model of the frame, calculating the strength, rigidity and modality of a classic working condition, converting a material variable into a continuous variable of relative density by using a variable density method, screening a design variable with pertinence, and optimizing the material-structure integrated optimization of the steel-aluminum hybrid frame. And designing a test by taking the grouped relative density and thickness as design variables, carrying out structural material integrated design on the frame by utilizing a response surface model and an MOGA algorithm, and verifying after an optimization result is obtained. The method is high in reliability and applicability, material-structure integrated optimization can be effectively carried out on the vehicle frame, the development cost is saved, the development period is shortened, and reference is provided for development of material-material optimization of the material-mixed vehicle frame.

Description

technical field [0001] The invention belongs to a lightweight design method for a vehicle frame, and in particular relates to a material-structure integration optimization method for a steel-aluminum hybrid vehicle frame. Background technique [0002] As a main bearing part of the car, the frame's quality and performance occupy an important part of the quality and performance of the vehicle, so the lightweight of the frame is one of the important positions for the lightweight of the car. At present, the methods of lightening automobiles and their parts are mainly the use of new materials, the use of advanced manufacturing processes and the change of structure. All three methods can make the frame obtain a significant weight reduction effect. With the continuous development of the automobile industry, it has been There have been new types of frames such as steel-aluminum hybrid frames, but the single optimization direction has gradually reached the limit of optimization, so t...

AI Technical Summary

Problems solved by technology

At present, the methods for reducing the weight of automobiles and their parts are mainly the use of new materials, the use of advanced manufacturing processes and structural changes. These three methods can make the frame obtain obvious weight reduction effects. With the continuous development of the automobile industry, it has New types of frames such as steel-aluminum hybrid frames have appeared, but the single optimization direction has gradually reached the limit of optimization, so the present invention proposes a material-structure integrated optimization method for steel-aluminum hybrid frames. In the process of introducing the structural variables and material variables of the frame panels at the same time, the degree of freedom in design optimization is increased, and the goal of lightweight frames can be met to a greater extent.

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