Method for building simplified parametric finite element model of car collision

Abstract

The invention discloses a method for building a simplified parametric finite element model of car collision, and aims to solve the problem of consumption of a large amount of modification and calculation time due to adoption of a conventional detailed finite element model in car body structure anti-collision design and improvement in the prior art. The method comprises the following steps of 1) establishing a topological structure of a car body: (1) obtaining a detailed finite element model of a car; (2) building a one-dimensional unit topological model of the car body; and (3) building a topological structure model of the car body; 2) extracting cross section parameters of parts; 3) extracting stiffness characteristics of the parts and performing parameterization: (1) extracting crushing stiffness characteristics and performing parameterization; (2) building finite element simulation models of the crushing parts by utilizing Hypermesh software and performing calculation by utilizing LS-DYNA software to obtain a crushing force-crushing quantity curve; and (3) simplifying the crushing force-crushing quantity curve according to an absorbed energy equality principle and performing parameterization; 4) simulating collision characteristics of the parts; and 5) verifying the simplified parametric finite element model.

Description

technical field [0001] The invention relates to a method for establishing a vehicle passive safety field, more precisely, the invention relates to a method for establishing a simplified parameterized finite element model of an automobile collision. Background technique [0002] Automobile passive safety refers to the performance that the vehicle can effectively protect the occupants or pedestrians outside the vehicle from injury or minimize the degree of injury in the event of a traffic accident. In order to improve the passive safety of automobiles, the body structure must be designed reasonably so that it can produce reasonable deformation and fully absorb the collision energy when a collision occurs. In the design and optimization process of the car body structure, the method of combining actual vehicle test and finite element simulation analysis is widely used at present. The finite element simulation analysis uses a computer to carry out a virtual crash test to obtain ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problem that the traditional detailed finite element model consumes a lot of modification and calculation time when the design and improvement of the crashworthiness of the car body structure exist in the prior art, and provides a simplified car collision parameter The establishment method of the finite element model

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