后保险杠（车身）模态分析规范

Q/SZJ191001-2017后保险杠（车身）模态分析规范SpecificationOfModeAnalysisForRearFascia(Vehicle)20XX20XX-09-30实施20XX-08-28发布XXXX汽车工程技术有限公司发布Q/SZXX-X-2017后保险杠（车身）模态分析规范范围本标准规定了后保险杠（车身）模态分析方法及结果处理方法。本标准适用于CAE部门后保险杠（车身）模态分析。规范性引用文件无。术语和定义无。摘要ABSTRACT本分析规范的目的是为了分析后保险杠在整车中的模态性能。Thepurposeofthisanalysisistoanalyzethemodalperformanceofrearfasciainvehicle.流程图ProcessFlowDiagram建模建模Model1stmode>25Hz截取车身CutBody约束边界Boundary设置参数计算Setparameter结束End优化Optimization图1流程图Fig1ProcessFlowDiagram工具描述ToolDescription仿真分析过程中需要用到的如下软件:Thefollowingsoftwarefacilitatestheanalyticalsimulationprocess:前处理(Preprocessors):Hypermesh求解器(AnalysisCode):MSC.Nastran后处理(Postprocessors):Hyperview建模和分析过程Modeling/AnalysisProcedure单位Units分析中所用单位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) 牛顿(N)质量(Mass) 吨(Ton)长度(Length) 毫米(mm)时间(Time) 秒(Second)内容Contents模型为含后保险杠的半车身或者整车模型Rearfasciamountedonthefullorhalfvehiclemodelmustusedforthisanalysis坐标系CoordinateSystems整车全局坐标系。Vehicleglobalcoordinatesystem.建模技巧ModelingTechniques无假设和限制Assumptions/Limitations无载荷和边界条件Loads/BoundaryConditions约束Constrains：约束车身截取处1-6DOF，车身与后保险杠系统之间连接用RBE2（约束1-3DOF），与车身连接的结构和车身之间用RBE2（约束1-3DOF）。theconstraintsonthetranslationDOFonlyonthepartialvehiclemodelshownbelow,Theattachmentpointsbetweencomponentsareassumedtoberigid(RBE21-3),connectionsbetweencomponentswithinfasciaassembly,Attachmentstothebodystructureareassumedtoberigid(RBE21-3)connections.加载Loads：无图2边界约束Fig2Boundarycondition结果Results无性能要求PerformanceRequirements后保险杠一阶模态大于25Hz，雾灯整体模态大于35Hz。1stRearFasciaglobalresonantfrequencyis>25Hz,1stfasciaintegratedfoglampresonantfrequenc