基于正面力传递路径的轿车车身结构耐撞性.PDFVIP

ISSN 1674-8484 汽车安全与节能学报 , 2011 年 , 第 2 卷 第 4 期 05/ 11 CN 11-5904/U J Automotive Safety and Energy, 2011, Vol. 2 No. 4 317 — 322 基于正面力传递路径的轿车车身结构耐撞性 * 刘　钊，朱　平 ，喻　明，卢家海 （上海交通大学　上海市数字化汽车车身工程重点实验室，上海 ，200240 ） 摘  要： 为了提高整车安全性，研究了某轿车车身结构耐撞性。分析了整车正面碰撞过程中碰撞力传 递路径，利用HyperWorks 软件，建立整车有限元模型，对车身结构关键零件（前纵梁、保险杠横梁 和冲撞盒）进行改进设计。利用LS-DYNA 软件，根据中国新车评价规程(CNCAP) 碰撞安全法规，进行 了100%刚性壁（RGB）正面碰撞和40%偏置可变形壁障(ODB) 偏置碰撞的数值仿真。结果表明：车身 结构改进后，两种碰撞的前围板侵入量明显降低；两侧B 柱加速度均减少；碰撞吸能增加（对100% RGB，增加 9.8 kJ；对40% ODB ，增加3.3 kJ）。 关键词： 汽车安全 ; 结构耐碰撞性；力传递路径；轿车车身；有限元法 (FEM)；偏置可变形壁障(ODB) 中图分类号： U 491.6 Passenger car-body crashworthiness based on the force transmission path of frontal impact * LIU Zhao, ZHU Ping , YU Ming, LU Jiahai Shanghai Jiao Tong University, Shanghai Key Laboratory of Digital Auto Body Engineering, Shanghai 200240, （ China ） Abstract: Structural crashworthiness was investigated for a passenger car-body to improve vehicle safety. The auto-body structure was analyzed based on the force transmission path of frontal impact, with the auto-body finite element model being built using the HyperWorks program and some key parts being improved including the front side rail, front cross rail and crash box for a passenger car-body structure. Two front impacts were numerically simulated using LS-DYNA program according to the crash regulation by China New Car Assessment Program, CNCAP, in which one is full front impact with rigid barrier