仪表板刚度分析规范

Q/SZJ191001-2017仪表板刚度分析规范SpecificationOfStiffnessAnalysisForIP20XX20XX-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仪表板刚度分析规范范围本标准规定了仪表板刚度分析的分析方法，以确定整车中仪表板的刚度。本标准适用于CAE部门仪表板刚度分析。规范性引用文件无。术语和定义无。流程图PROCESSFLOWDIAGRAM建模Model建模Model刚度达标Stiffness？截取车身CutBIW约束边界Boundary加载Load结束End优化Optimization图1流程图Figure1ProcessFlowDiagram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):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) N质量(Mass) Ton长度(Length) mm时间(Time) s内容Contents坐标系CoordinateSystems建模技巧ModelingTechniquesIP建模仅可能使用壳单元。用刚体模型代替转向管柱。模型截取按照A柱前250mm、A柱后1200mm（或者靠近B柱前侧位置）。截取模型边界约束1-3自由度。尽量做到如下措施：仪表板支撑板，用集中质量代替风道和控制块。HVAC，鼓风机，散热器等尽量使用壳单元和非结构质量描述，也可以使用Rbe3和集中质量点建模IP上覆盖的泡沫等质量通过非结构质量NSM赋予IP实际所覆盖的面积上IP上的内饰件比如管道，控制器之类的使用集中质量代替ModeltheentireIPstructureusingShellelements.UseaRigidmodeltorepresenttheSteeringColumn.UsetheportionofthevehicleBIWmodel250MMforwardofthe“A”Pillarand1200MMrearwardof“A”Pillar(orjustforwardofthe“B”Pillar).Thecut-offsectionsoftheBIWmodelareconstrainedwithDOF123Ifpossible:ModeltheIPretainertrimpanelanduseconcentratedmassestorepresentventsandcontrols.ModeltheHVAC,BlowerMotor,Radio,andInstrumentclusterascloselyaspossiblewithShellelementsandusedistributedNSMinthePSHELLcard.RBE3sandConcentratedMassmaybeusedtorepresentthesecomponents.ModeltheentireIPretainerusingshellelements.Modelthefoammassasnon-structuralmass(NSM)overtheareaofIPcoveredwithfoam.假设和限制ASSUMPTIONS/LIMITATIONS以上截取的车身刚度等同整车刚度刚体转向模型不会影响IP的刚度Thesectionofthevehicledescribedaboverepresentsthevehiclestiffness.UseofarigidcolumnmodelfacilitatesaccurateassessmentoftheIPstructure.约束和边界条件CONSTRAINTS/BOUNDARYCONDITIONS约束截取车身模型处边界1-3自由度约束车身前悬置弹簧安装点1-6自由度Thesectionofthevehicledescribedaboverepresentsthevehiclestiffness.UseofarigidcolumnmodelfacilitatesaccurateassessmentoftheIPstructure.图2边界约束Fig2Boundarycondition载荷LOADS在转向管柱顶端中心点横向纵向1000N的集中载荷ApplyspecifiedconcentratedverticalandlateralforcesattheHubcenterofthesteeringcolumnrepresentation.性能要求PERFORMANCEREQUIREMENTS满足刚度要求目标Meetthetarget分析要求ANALYSISREQUIREMENTSmarks位移测量点为加载点刚度值=力/加载点位移Determinetheverticaldisplacementatthepointofapplicationofloadontherigidsteeringcolumn.CalculatetheIPstiffness(Stiffness=forceatthepointofapplication/verticaldisplacementatthepointofapplication).输出文件OutputFiles无。分析时长AnalysisDura