Complete automobile collision simulation method on basis of parameterization design

Abstract

The invention relates to a complete automobile collision simulation method on the basis of the parameterization design and belongs to the field of a nonlinear finite element and nonlinear multi-body dynamics. The method comprises the following steps of: calculating collision force and a stroke of each power-absorbing component by nonlinear finite element software; according to series/parallel power-absorbing characteristics of the power-absorbing components, determining an equivalent total rigidity of power adsorption devices between carriages; then establishing a complete automobile collision dynamic performance analysis model on the basis of the parameterization design; and combining the complete automobile collision dynamic performance analysis model with constraint conditions to obtain an optimal combination of the power-absorbing characteristics of the power-absorbing components so as to obtain the optimal values of motion and a longitudinal load of each carriage in the complete automobile collision process. In the method, the nonlinear finite element and the nonlinear multi-body dynamics are combined to carry out complete automobile collision simulation research; the nonlinearity and the elastic plastic deformation of a material are simulated by the established model; and meanwhile, the collision simulation analysis of an automobile head is expanded to the complete automobile.

Description

technical field [0001] The invention relates to a whole vehicle collision simulation method based on parametric design, which belongs to the field of rail vehicle whole vehicle collision research combining nonlinear finite element and nonlinear multi-body dynamics. Background technique [0002] The train is composed of multiple carriages, and its collision is different from the single collision of automobiles, airplanes, ships and other means of transportation. It not only has the collision damage of a single vehicle, but also has the collision problem of each workshop. The train multi-body coupled impact has both multi-particle system dynamics and structural dynamics with large plastic deformation. Theories and methods of mechanics. At present, there are two main types of domestic research on passive safety technology for rail vehicles: one is to use multi-body dynamics software to analyze the kinematics and dynamics characteristics of trains during collisions, because the...

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Problems solved by technology

At present, there are two main types of domestic research on passive safety technology for rail vehicles: one is to use multi-body dynamics software to analyze the kinematics and dynamics characteristics of trains during collisions, because these softwares cannot simulate the nonlinearity of materials well. and elastic-plastic deformation, engineering application has its limitations; the other is to use finite element software such as LS-DYNA, MSC-DYTRAN, etc. for large deformation and nonlinear transient analysis of structures. The deformation and distortion of the time step will cause a sharp decrease in the time step, resulting in a decrease in calculati...

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