车灯（系统）模态分析规范

Q/SZJ191001-2017车灯（系统）模态分析规范SpecificationOfModeAnalysisForHeadlamp(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车灯（系统）模态分析规范范围本标准规定了车灯（系统）模态分析方法及结果处理方法。本标准适用于CAE部门车灯（系统）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确定整车状态下车灯第一阶模态。Thepurposeofthisanalysisistodeterminethe1stnaturalfrequencyfortheheadlamp.流程图ProcessFlowDiagram建模建模Model1stmode>45Hz确定安装点fixedpoint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无坐标系CoordinateSystems整车全局坐标系。Vehicleglobalcoordinatesystem.建模技巧ModelingTechniques包含灯壳，灯丝，以及带有转动惯量的车灯的质量信息。Includelamphousing,lens,remaininglampmass,andwherenecessarysignificantlampinternals.假设和限制Assumptions/Limitations无载荷和边界条件Loads/BoundaryConditions约束Constrains：与车身连接的点约束1-6DOF；与灯相连接零部件连接点用RBE2模拟，约束1-3DOF；与车身相连的连接点用RBE2模拟，约束1-3DOF；车灯用CONM2单元模拟包含转动惯量信息，车灯质量在质心处用RBE3连接到车灯壳上。MultiplenodesSPC’s1-6,areusedtogroundthecomponentwhereassemblywouldbemountedtothebody.Theattachmentpointsareassumedtoberigid(RBE21-3);connectionsbetweencomponentswithinthelampassembly.ThemassoftheheadlampshouldberepresentedusingaCONM2massattheCGofthelampwiththeappropriatemomentofinertiavaluesinthemasscard.ThemassisdistributedwithaRBE31-6atCGtothehousingRBE31-3.加载Loads：SOL103ModeSol103图2边界约束Fig2Boundarycondition结果Results无性能要求PerformanceRequirements车灯一阶模态大于45Hz。1stheadlampresonantfrequencyis