SUV白车身扭转刚度的分析与优化

Torsion Stiffness Analysis and Optimization of SUV Body-in-white

某款SUV开发过程中,由于后围部分门洞开口较大并且缺少包裹架结构,引起白车身扭转刚度不满足设计目标(≥17 000 N·m/(°))。对其建立有限元模型并进行扭转工况加载和受力分析以及灵敏度分析,依据白车身结构力学特性及分析结果进行优化设计,使其扭转刚度提升至17 870 N·m/(°),提升率达22.5%。通过此种分析方法和优化方案,可以在车身数据设计阶段提升车身扭转刚度,大大缩短开发周期,降低开发成本。

Body-in-white torsion stiffness can＇t meet the design target（≥17 000 N·m/（°））in SUV development process due to larger opening in rear wall area and no package bracket. Taking a SUV white body as the research object, the finite element model of a SUV is established and the stress analysis and sensitivity analysis are carried out. According to the mechanical properties of the white body structure and the analysis results, the torsion stiffness increases to 17 870 N·m/（°）,the increase rate reaches to 22.5%. The analysis method and optimization can improve the body torsion stiffness in the body data design stage, greatly shorten the development cycle and reduce the development cost.