基于梁与接头灵敏度分析的白车身刚度模态优化.doc

基于梁与接头灵敏度分析的白车身刚度模态优化.doc基于梁与接头灵敏度分析的白车身刚度模态优化摘要:白车身结构显著影响整车性能,,通过参数化技术,快速将车身主要框架划分为梁和接头结构•分别局部刚化处理49处左右对称结构,分析各结构对扭转刚度、弯曲刚度、后部扭转模态影响的灵敏度•结果表明,D柱下段、顶盖后横梁、下地板后纵梁等结构的单位质量对扭转刚度贡献量超过5%;后地板横梁、前地板后纵梁、后地板纵梁等结构单位质量对弯曲刚度的贡献量超过4%.通过8处灵敏度较高的结构优化和厚度优化,同时对性能影响小的结构减薄、减件,结合工艺改进,实现白车身质量不增加,%,%,%.关键词:参数化设计;灵敏度分析;结构刚化;接头;梁单元中图分类号:U463文献标志码:AModalOptimizationofBody-in-WhiteStiffnessBasedonSensitivityAnalysisofBeamandJointYAOZaiqil,2,3,MENYongxin3,LILuoxing1,2,MAOXuefeng4,ZHULing3,MAFangwu5Abstract:ItisknownthatBody-in-Whitestructuresignificantlyinfluencesthevehicleperformance,,,bendingstiffness,andreartorsionalmodaltoeachlockedrigidstructurewasanalyzedandranked・Therelativesensitivitiesofthestructures,suchasBEAM_D-PLR_LWR,BEAM_ROOF_RR,andRAIL_RRonthetorsionalstiffnessweremorethan5%,whiletherelativesensitivityofthestructures,suchasFLOOR_RR_CB_FRT,RAIL_CTR,andRAIL_RRonthebendingstiffnesswasmorethan4%.%,%,%bymeansofstructureandthicknessoptimization、structuralthinningandreduction,andprocessi