Abstract: This paper takes formula student electric China (FSEC) racing car as the research object and carries out multi-dimensional optimization design research about the power system and transmission system. Through the theoretical calculation and simulation analysis, a transmission ratio matching model based on the maximum speed constraint and acceleration performance requirements is established, and the optimization scheme with the main transmission ratio of 3.76 is determined, as well as the performance advantages of the transmission ratio in endurance racing and high-speed obstacle avoidance scenarios are verified by using Optimum Lap software. For the chain transmission system, combined with the structural design of the large sprocket hollow six-pointed star, the innovative use of 7050 aluminum alloy material not only achieves the target lightweight but also ensures the dynamic strength requirements (safety factor is 15.4). ANSYS finite element simulation is verified that the maximum equivalent stress of the sprocket bank under extreme conditions (emergency braking) is 36.975 MPa, which is significantly lower than the ultimate strength of the material, confirming the reliability of the design. The results provide a reference paradigm for the design of the transmission system of FSEC with both theoretical depth and engineering practical value.

Key words: FSEC racing car; transmission system design; dynamic matching; chain drive optimization; finite element analysis

摘要： 文章以中国大学生电动方程式汽车大赛（FSEC）赛车为研究对象，围绕其动力系统与 传动系统展开多维度优化设计研究。通过理论计算与模拟分析，建立了基于最高速度约束和 加速性能需求的传动比匹配模型，确定了主传动比为 3.76 的优化方案，并在耐久赛和高速避 障场景下，利用 Optimum Lap 软件验证了这一传动比的性能优势。针对链传动系统，结合大 链轮镂空六芒星的结构设计，创新性地采用 7050 铝合金材质，既实现目标轻量化，又保证动 态强度要求（安全系数为 15.4）。链轮组在极端工况（紧急制动）下的最大等效应力为 36.975 MPa，经 ANSYS 有限元模拟验证，远远低于材料极限强度，确认设计可靠。该成果为 FSEC 赛车传动系统的设计提供了参考范式，理论深度和工程实践价值二者兼备。

关键词: FSEC 赛车；传动系统设计；动力匹配；链传动优化；有限元分析