Abstract: In response to the increase of the frontal collision speed to 55 km/h and the 21% increase in collision energy in the China-new car assessment program (C-NCAP), based on the principle of conservation of energy, a "sandwich cage style" force transmission path for the front cabin and a step-by-step controllable deformation strategy are proposed in this paper. Simulation analysis is carried out with the aid of computer aided engineering (CAE) technology, and its accuracy can reach more than 95%. Moreover, the analysis results have all passed the verification of real vehicles, achieving the goals of directional folding of collision force and graded energy absorption of "soft front and hard rear". The front fender intrusion is reduced by 19.6%, the peak acceleration of the B-pillar is decreased by 13.2%, and the energy absorption efficiency is increased by 17.8%. The five-star vehicle body safety standard is achieved, providing a basis and solution for the safety design of high-energy collision structures of electric vehicles.

Key words: frontal collision; sandwich cage style; step-by-step controllable deformation strategy;directional folding

摘要： 针对中国新车评价规程（C-NCAP）正面碰撞速度提至 55 km/h，碰撞能量增加 21%， 依据能量守恒原理，文章提出前舱“三明治笼式”传力路径及逐级可控变形策略，借助计算 机辅助工程（CAE）技术开展仿真分析，其精度可达 95%以上，且分析结果均通过了实车验 证，达成碰撞力定向折叠与“前软后硬”分级吸能目标。实现前围板侵入量降低 19.6%，B 柱加速度峰值减少 13.2%，吸能效率提升 17.8%，达成五星车体安全标准，为电动汽车高能量 碰撞结构安全设计提供依据与方案。

关键词: 正面碰撞；三明治笼式；逐级可控变形策略；定向折叠