事故车辆局部变形精细计算与模拟系统

在收集汽车碰撞事故相关典型案例基础上,以事故车辆局部复杂变形区域为研究对象,采用有限元方法、六面体网格生成算法及十节点曲边四面体对事故车辆变形部位变形前后划分网格.针对各网格单元,采用车辆动力学及弹性力学理论建立碰撞力计算模型以及碰撞瞬间速度计算模型.在汽车碰撞事故虚拟再现分析中,通过拟合网格单元以较高的计算精度得到事故发生前汽车的运动速度大小和方向.

Refined Calculation and Simulation System of Local Deformation for Accident Vehicle

The present paper aims to identify the cause and process of vehicle crash. The object of study is local large deformation for accident vehicle. Based on collecting the typical accident cases related to the vehicle crash, this study divides local large deformation into grid using finite element method, hexahedral mesh generation algorithm and ten node curved edge tetrahedr~l element. Aim to each grid cell, this study builds calculation mode! of the impact force and instantaneous speed using vehicle dy- namics model, elastic mechanics, when collisiQp occurs. In the process of the analysis for vehicle crash accident, this study got the speed value and direction of the vehicle before the accident occurs, whichhave higher computational accuracy.Therefore,this study can provide scientific theoretical foundationfor accident analysis and identification.