Optimal design method of passenger car thin-walled beam

Abstract

The invention discloses an optimal design method for thin-walled beams of a passenger car. The optimal design method comprises the following steps: S1, establishing finite element models of various thin-walled beams with different sections; S2, performing collision simulation to select a thin-walled beam with an optimal section; S3, energy absorption grooves with V-shaped or U-shaped sections being added to the thin-wall beams in the S2; S4, selecting an energy absorption groove with an optimal shape; S5, the optimal energy absorption groove adding number being selected on the thin-walled beamwith the optimal section; S6, the thickness of the thin-walled beam, the side length of the section of the energy absorption groove and the distance between the energy absorption grooves serving as optimization variables, and DOE experimental design being conducted through a Hammersley experimental design method; s7, establishing an approximate model through a HyperKriging method; s8, establishing an optimization model by taking maximum energy absorption as a target and taking the condition that the collision acceleration is smaller than a value before optimization as a constraint; s9, adopting a genetic algorithm for optimization, and the optimal value of each variable being calculated; s10, performing collision simulation on the framework provided with the original thin-wall beam and the passenger car framework provided with the optimized thin-wall beam; s11, analyzing a collision result of the two whole vehicles; therefore, the optimized safe energy absorption structure of the thin-walled beam is obtained.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an optimal design method for thin-walled beams of passenger cars. Background technique [0002] The safety performance of a passenger car directly affects the life and property safety of passengers. When a bus accident occurs, the design structure of the thin-walled beam of the bus deforms in a predetermined way during the collision, which can effectively absorb the collision energy and generate a good collision waveform, which can reduce the impact damage of the occupants, especially the driver, and provide the occupants with a living space . [0003] Chinese invention patent (application number: CN201810451880.2) "A thin-walled beam deformation guiding structure" discloses a thin-walled beam deformation guiding structure, which belongs to the field of thin-walled beam design and manufacturing, including thin-walled beams, heated areas, and unheated areas. Along the axial ...

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Problems solved by technology

[0008] In order to solve the above problems, the present invention proposes a method for optimizing the design of thin-walled beams for passenger cars. The method optimizes the design of the thin-walled beams from the perspectives of improving the energy absorption of the thin-walled beams and reducing the collision acceleration, so as to solve the problem of incomplete energy absorption of the thin-walled beams and improve the impact of passenger cars. security

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