汽车-护栏系统耐撞性研究的有限元模型

Finite Element Model for Crashworthiness Study of Vehicle Crash Barrier System

为了建立汽车及公路护栏组成的复杂系统的耐撞性分析模型,基于VPG与LS-DYNA软件平台,应用标准化建模方法,即通过设定建模原则,在充分利用VPG内置的标准模型数据库如悬挂、轮胎、假人、安全带等各种模型的基础上,采用分块建模法,分别建立汽车、护栏、座椅模型,定义好各自内部的接触;并利用VPG的“export”功能,生成各自的DYN文件;再利用生成的DYN文件,就可组合出汽车-护栏系统耐撞性研究的各种中间环节的有限元模型,最终实现“汽车-护栏-乘员-座椅-安全带”系统模型的一体化。仿真分析与试验结果的对比表明,笔者建立的模型具有足够的可信度,适合工程应用,并给出了一个应用示例。

In order to establish a crashworthiness analysis model for the complicated system composed of vehicle and highway crash barrier, standardized modeling based on VFG and LS-DYNA software is used. Modeling rules are set, taking full advantage of the database of standard Model involved in VFG such as suspension, tire, durrrny, seat belt etc as the bases, respective DYN files are formulated using export function of VFG to establish models of vehicle, crash barrier and seat respectively by parted modeling method. The respective inner contact is defined. By these formulated DYN files, the finite element model for the crashworthiness system study of various intermediate links of vehicle and crash barrier system could be composed. Eventually, the integrated model of ＂automobile-crash barrier-passenger-seat-seat belt＂ is obtained. Comparison of simulated analysis and experimental results shows that the model established is fully reliable and applicable in engineering. The model is exemplified with an application case.