Abstract: To reduce the mass of a truck frame while ensuring its service performance, a finite element model is first established for the frame's static analysis under four working conditions and modal analysis. Then, according to the finite element analysis results, parameters with great lightweight potential including the crossbeam hole diameter and the upper and lower flange lengths of the longitudinal beam are selected for parametric modeling and orthogonal tests. The results show that the upper flange length of the longitudinal beam has the most significant influence on the service performance of the frame, and the influence trends of various parameters on the frame performance are clarified. Finally, the response surface method is adopted for multi-objective optimization, achieving a 5.22% reduction in the frame mass while satisfying the service performance requirements.

Key words: truck frame; statics; modal analysis; lightweight

摘要： 为降低货车车架质量并保障使用性能，首先建立车架四工况静力学及模态分析有限元 模型；随后依据有限元分析结果，选取轻量化潜力较大的横梁孔直径、纵梁上下折边长度参 数开展参数化建模与正交试验。结果表明，纵梁上折边长度对车架使用性能影响最为显著， 并明确了各参数对车架性能的影响趋势，最后采用响应面法进行多目标优化，实现车架质量 降低 5.22%，且性能满足使用要求。

关键词: 货车车架；静力学；模态分析；轻量化