微型电动汽车车身的轻量化

Lightweight Study on A Mini Electric Vehicle Body

目前对于电动汽车车身轻量化研究中,多数都没能兼顾优化后车身性能、优化效率和精度。为了提高轻量化后车身的性能,提出一种综合考虑质量、刚度与一阶振动模态的多目标优化设计法。将有限元分析法和实验验证相结合,构造了基于材料和尺寸的微型电动汽车车身轻量化方法,确保了优化精度。采用灵敏度分析法确定关键部件厚度为优化模型的设计变量,提高了轻量化研究的效率。与传统的轻量化研究相比,该方法在获得近似最优解的同时能够保证轻量化后的车身性能满足要求,并且提高了计算效率和精度。

Most of the recent lightweight studies of electric vehicle body wasn＇t considered the performance of optimized vehicle body, the optimization efficiency and accuracy. In order to improve optimized vehicle body performance,a kind of multi-objective design optimization method considering mass,stiffness and the first order vibration mode is proposed. Combined with finite element analysis method and experimental verification,the lightweight method of electric vehicle body based on material and structure was constructed to ensure the optimization accuracy.Sensitivity analysis method is adopted to define the key components＇ thicknesses as the variables of optimization model for improving the efficiency of the lightweight study. In comparsion with the traditional deterministic lightweight study,this method not only obtains an approximate optimal solution but also ensures the optimized vehicle body＇s performance,and it also improves the optimization efficiency and accuracy.