刘善英　宁子允　陈祖兴

摘 要：方法：本文通过构建SFE参数化模型，并应用拓扑优化手段对白车身结构进行灵敏度分析。然后根据车身结构灵敏度分析及车身截面灵敏度分析结果进行方案设计与分析验证，以探讨在车身结构设计前期应用SFE及拓扑优化进行车身性能初步分析的可行性。结论：SFE参数化模型与拓扑优化可以作为车身设计前期可靠的性能分析手段，可提前对车身性能进行评估，并可根据灵敏度提出具有针对性的优化建议，为后续车身设计中性能、重量与成本的平衡具有一定的指导意义。

关键词：SFE 拓扑优化 白车身 灵敏度 结构优化

Application of Sensitivity Analysis Based on SFE Parametric Model to Optimization of Body-in-White Torsion Performance

Liu Shanying，Ning Ziyun，Chen Zuxing

Abstract：Method： this paper constructs an SFE parameterized model and applies topology optimization methods to analyze the sensitivity of the body-in-white structure. Then， based on the body structure sensitivity analysis and the body section sensitivity analysis results， the program design and analysis verification are carried out to explore the feasibility of applying SFE and topology optimization to the preliminary analysis of body performance in the early stage of the body structure design. Conclusion： SFE parameterized model and topology optimization can be used as a reliable performance analysis method in the early stage of car body design. It can evaluate car body performance in advance， and can propose targeted optimization suggestions based on sensitivity to provide performance， weight and cost in subsequent car body design. The balance has a certain guiding significance.

Key words：SFE， topology optimization， body-in-white， sensitivity， structural optimization

对于白车身系统开发来说，性能、成本、重量是开发的核心目标，但是三者关系复杂，即相互关联又相互矛盾。日趋严苛的油耗要求是车身重量的主要诉求，重量减少能带来油耗降低、成本降低的显著效益。但消费者日益关注的性能及不断严苛的安全法规则驅使着车身性能需不断提高，安全、舒适度、操控耐久等则是车身性能的主要诉求[1]。性能的提升则意味着零件数量的增加、重量的增加、新技术的大量应用等等，相应的给成本与重量提出了较大的需求。因此车身开发面临着高性能、轻量化、低成本的挑战。传统的车身开发需要借助多轮CAE仿真分析及优化来达到较为合理的车身结构，整个过程会消耗较长周期。拓扑优化可以实现多目标的最优化设计，并拟合出精度很高的性能曲线（或曲面）[2]。……