【摘要】 为提高电动载货汽车轻量化水平，本文提出了一种车架与电池舱一体化（cell to frame-简称“CTF”）结构。首先建立对标车型车架有限元模型，计算了其静力学性能与自由模态，并通过自由模态试验验证有限元模型的准确性。然后采用道路实采的多工况组合疲劳载荷谱在时域内运用名义应力法进行车架疲劳寿命分析。接着对经有限元分析验证合理的CTF结构初始设计进行试验设计并建立代理模型。最后采用全局响应面法进行优化设计，获得最佳轻量化方案。结果表明，优化设计后，CTF结构质量相较于传统的车架与电池舱分离设计结构轻量139.95 kg，轻量化率达14.09%，同时CTF结构力学性能与疲劳寿命均满足设计要求。更多还原

【Abstract】 To improve the lightweight level of electric cargo vehicles, a Cell To Frame(CTF) structure that integrates the frame and battery compartment is proposed in this paper. Firstly, a finite element model of the benchmark vehicle frame is established, and its static performance and free mode are calculated. The accuracy of the finite element model is verified through free mode experiments. Then, the fatigue life analysis of the frame is carried out using the nominal stress method in the time domain using the multi working condition combination fatigue load spectrum obtained from road sampling. Next, experimental design is conducted on the initial design of the CTF structure, which has been validated by finite element analysis, and a surrogate model is established. Finally, the global response search method is used for optimization design to obtain the optimal lightweight solution. The results show that after optimized design, the weight of the CTF structure is reduced by 139.95 kg compared to the traditional separation design of the frame and battery compartment, with a lightweight rate of 14.09%. At the same time, the mechanical properties and fatigue life of the CTF structure both meet the design requirements.更多还原