Abstract: Based on the N1 type multi-purpose vehicle model, this paper uses LS-Dyna software to carry out an extended optimization simulation analysis of the body structure to evaluate the strength of the optimized front and rear rollover structures; and according to the optimization results, real vehicle trial production and tests are carried out to verify the reliability of the optimization scheme; the results show that, before the optimization, the lower part of the B-pillar was plastically bent, and the front windshield beam was seriously deformed. After the optimization, the body deformation was significantly reduced, and the distance between the upper body and the production space reached 92 mm, with a high safety margin; according to the optimization results, the actual vehicle was restructured and strengthened, and carry out tests according to regulations. The results show that the minimum distance from the car body to the living space is 115mm, which meets the requirements of simulation analysis and meets the strength of regulations. GB—17578 Strength Requirements and Test Methods of Passenger Car Superstructure regulations, economical and reliable.

Key words: M2 class car; Simulation; Structure optimization; Body structure design; Real car test

摘要： 文章基于 N1 类多用途汽车车型，采用 LS-Dyna 软件对车身结构进行拓展优化仿真分 析，评估优化前后侧翻结构强度。并根据优化结果开展实车试制与试验，验证优化方案可靠 性。结果表明，优化前，B 柱下部塑性折弯，前挡风玻璃横梁变形严重，优化后，车身变形 显著降低，车身上部与生产空间距离达到 92 mm，安全裕度高；根据优化结果对实车进行改 制加强，并按法规开展试验，结果显示车身至生存空间的最小距离为 115 mm，达到仿真分析 要求，满足法规强度；通过仿真分析对 N1 类多用途汽车车型进行结构优化，可针对性加强车 身，从而达到 GB—17578《客车上部结构强度要求及试验方法》法规要求，经济、可靠。

关键词: M2 类车；仿真分析；结构优化；车身结构设计；实车验证