摘要
针对某电动汽车前机舱吸能不足,前纵梁后端抗弯性能薄弱等问题,参照法规及C-NCAP要求,运用Hypermesh和LS-DYNA软件建立了全宽正面碰撞有限元模型,并对该电动汽车前机舱进行了耐撞安全性分析。采取了"改变前纵梁内部加强板的位置、并改变相应焊点"的优化措施,对优化前后的机舱吸能、刚性墙撞击力、车身加速度、前纵梁抗弯性能等进行了比较。仿真计算结果表明:在几乎没有增加成本的前提下,该结构在优化后碰撞吸能提高3.5%,刚性墙撞击峰值力降低11.73%,峰值加速度降低3.8%,左纵梁后端抗弯能力提高28.6%,右纵梁后端抗弯能力提高4.7%,实现了良好的优化效果。
Aiming at the problem that the energy absorption of an electric vehicle＇s front cabin is insufficient and bending performance of the backend of front rails is not good, refers to the requirements of the regulations and the C-NCAP, the full-width frontal crash finite element model was built by Hypermesh and LS-DYNA software, the crashworthiness of front cabin was investigated. The location of the internal reinforcing plate of front rail and the welding spots were changed. The energy absorption of front cabin, the rigid wall impact force, the acceleration and the flexural capacity of the backend of front rail were compared before and after optimization. Simulation results indicate that, on the premise of almost no increase in the cost, the energy absorption of this structure increases by 3.5% after optimization, the rigid wall impact peak force decreases by 11.73%, the peak acceleration reduces by 3.8%, the ftexural capacity of the backend of left front rail increases by 28.6%, and the flexural capacity of the backend of right front rail increases by 4.7%. The effect is good through optimization.
出处
《机电工程》
CAS
2013年第3期325-328,共4页
Journal of Mechanical & Electrical Engineering
基金
浙江省自然科学基金(重点)资助项目(LZ12E05003)
浙江省汽车安全技术实验室开放基金重点资助项目(LHY11090563)
关键词
电动汽车
耐撞性
有限元
优化设计
electric vehicle
crashworthiness
finite element
optimization design
