某车型正面40%偏置碰撞的车体结构优化  

Car-body structure optimization of front 40% offset impact on a vehicle

作　　者：王月[1] 尹高纪[1] 周大永[1,2] 刘卫国[1,2] 孙立志[1] 

机构地区：[1]浙江吉利汽车研究院有限公司 [2]浙江省汽车安全技术重点实验室

出　　处：《汽车安全与节能学报》2014年第4期371-377,共7页Journal of Automotive Safety and Energy

基　　金：浙江省汽车安全技术研究重点实验室建设项目(2009E10013)

摘　　要：某车型在64 km/h正面40%偏置碰撞试验中,出现踏板和转向管柱的侵入量超标问题。其原因是:更换动力后,前机舱变形空间减小,车体纵梁变形模式不合理,及前围板附近位置的强度较低。为此,该文提出了优化方案:调整纵梁的材料及修改纵梁内加强板的结构,来提高纵梁总成整体结构强度,增加加强件,来提高前围的总体强度。运用Hyperworks及LS-DYNA软件进行仿真分析。结果表明:优化后,改善了纵梁的变形模式,前围板侵入量减小了42 mm;乘员的伤害也得到改善,整体得分提高1分。因此,该优化方案合理,车身结构的加强对乘员起到很好的保护作用。The reasons were analyzed why steering column deformation and pedal deformation exceeded the standard values in 64km/h positive 40% offset impact. It is because the available space decreases after changing powertrain, with unreasonable vehicle rail deformation mode and low vehicle cowl strength. An optimization scheme was proposed including changing the rail material and modifying the strengthening plate structure of the rail inner to improve the rail assemble strength with strengthening plates added to raise the cowl strength. Hyperworks and LA-DYNA soft wares were used for simulation analysis. The results show that the optimization improves the deformation mode, decreases the cowl invasion by about 42mm, and decreases passenger injuries with the total point increasing by one. Therefore, the structure strengthens occupants＆#39; protection. The results show the reasonability of the optimization scheme.

关 键 词：汽车安全 正面碰撞 纵梁 前围板 车体结构优化 

分 类 号：U461.91[机械工程—车辆工程]