Multi-cell energy absorption structure combination optimization design method

Abstract

The invention discloses a multi-cell energy absorption structure combination optimization design method, which comprises the following steps: establishing a multi-cell energy absorption structure finite element model according to a material to be optimized, and determining a design variable, a constraint condition and an optimization target; carrying out an orthogonal experiment according to the established three-level design variable table of the variables and an optimization target; establishing a target response data matrix, and performing Taguchi analysis on the target response data matrix; performing grey correlation analysis based on the normalized signal-to-noise ratio sequence of each response to obtain a grey correlation coefficient sequence corresponding to each response; determining a preliminarily optimized variable combination to realize rapid positioning of a preliminarily optimized result in a large space; selecting a significant influence variable and carrying out secondary optimization by using a preliminary optimization variable; and carrying out multi-objective continuous optimization design to obtain a Pareto leading edge of an optimization problem, and determining an optimal compromise design point. According to the method, the specific energy absorption of the structure can be improved, the peak acceleration can be reduced, and the lightweight and safety performance of the structure can be improved to a great extent.

Description

technical field [0001] The invention relates to the lightweight and structural design technology of an automobile body, in particular to a combination optimization design method of a multicellular energy-absorbing structure. Background technique [0002] With the continuous development of the automobile industry and the increasing shortage of energy resources, people are paying more and more attention to structures with better performance to reduce energy consumption. Cellular structures, such as honeycomb structures, are increasingly used in cushioning and energy-absorbing structures such as energy-absorbing boxes, front side members, and bumpers of automobiles due to their stable energy absorption performance, light weight, high specific strength and specific stiffness superior. Therefore, how to design an energy absorber with high specific energy absorption and small peak acceleration is a problem worth studying. [0003] The design of parameters such as material and th...

AI Technical Summary

Problems solved by technology

The problem with the traditional multi-objective continuous optimization design method is that in the case of uncertain design space, the degree of improvement of the target response after optimization is greatly limited; for multi-variable and large-interval design problems, the number of iterations will be too high. Many, the optimization efficiency is low, resulting in a large calculation cost

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