Q/SZJ191001-2017儀表板模態(tài)分析規(guī)范SpecificationOfModeAnalysisForInstrumentPanel20XX20XX-09-30實(shí)施20XX-08-28發(fā)布XXXX汽車工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017儀表板模態(tài)分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了儀表板模態(tài)分析方法及結(jié)果處理方法。本標(biāo)準(zhǔn)適用于CAE部門儀表板模態(tài)分析。規(guī)范性引用文件無。術(shù)語和定義無。摘要ABSTRACT本分析規(guī)范的目的是為了確定整車中儀表板的第一階模態(tài)ThepurposeofthisanalysisistodeterminethefirstnaturalfrequencyoftheInstrumentPanel(IP)assemblyinthevehicle流程圖ProcessFlowDiagram建模建模Model1stmode>35Hz截取車身CutBIW約束邊界Boundary設(shè)置參數(shù)計(jì)算Setparameter結(jié)束End優(yōu)化Optimization圖1流程圖Fig1ProcessFlowDiagram工具描述ToolDescription仿真分析過程中需要用到的如下軟件:Thefollowingsoftwarefacilitatestheanalyticalsimulationprocess:前處理(Preprocessors):Hypermesh求解器(AnalysisCode):MSC.Nastran后處理(Postprocessors):Hyperview建模和分析過程Modeling/AnalysisProcedure單位Units分析中所用單位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) 牛頓(N)質(zhì)量(Mass) 噸(Ton)長(zhǎng)度(Length) 毫米(mm)時(shí)間(Time) 秒(Second)內(nèi)容Contents無坐標(biāo)系CoordinateSystems整車全局坐標(biāo)系。Vehicleglobalcoordinatesystem.建模技巧ModelingTechniquesIP建模僅可能使用殼單元IP上覆蓋的泡沫等質(zhì)量通過非結(jié)構(gòu)質(zhì)量賦予IP實(shí)際所覆蓋的面積上IP上的內(nèi)飾件比如管道，控制器之類的使用集中質(zhì)量代替HANC，鼓風(fēng)機(jī)，散熱器等盡量使用殼單元和非結(jié)構(gòu)質(zhì)量描述，不要使用Rbe3和集中質(zhì)量點(diǎn)建模模型需要有轉(zhuǎn)向管柱模型模型截取按照A柱之前250mm，A柱之后1200mm（或者靠近B柱前側(cè)位置），為了保證IP所有的質(zhì)量信息均包含在內(nèi)截取模型邊界約束1-3自由度，前懸彈簧安裝點(diǎn)約束1-6自由度ModeltheentireIPstructureusingPlateelements.ModeltheentireIPretainerusingplateelements.Modelthefoammassasnon-structuralmass(NSM)overtheareaofIPcoveredwithfoam.ModeltheIPretainertrimpanelanduseconcentratedmassestorepresentventsandcontrols.ModeltheHVAC,BlowerMotor,Radio,andInstrumentcluster,ascloselyaspossiblewithShellelementsandusedistributedNSMinthePSHELLcard.DonotuseRBE3sandConcentratedMasstorepresentthesecomponents.UseacorrelatedSteeringColumnmodel.UsetheportionofthevehicleBIWmodel250MMforwardofthe“A”pillarand1200MMrearwardof“A”Pillar(orjustforwardofthe“B”Pillar)andmakesuretheBoastermassisrepresented.Thecut-offsectionsoftheBIWmodelareconstrainedwithDOF123,andtheBodyMountisconstrained1-6.假設(shè)和限制Assumptions/Limitations以上截取的車身剛度等同整車剛度，阻尼對(duì)分析無影響。Theportionofthevehicledescribedaboverepresentsthevehiclestiffness,Dampingforcesareinsignificanttothisanalysis.載荷和邊界條件Loads/BoundaryConditions約束Constrains：約束截取車身模型處邊界1-3自由度，約束車身前懸置彈簧安裝點(diǎn)1-6自由度。ConstrainthecutsectionsofthebodymodelwithDOF123,ConstrainthebodymountwithDOF1-6.加載Loads：無圖2邊界約束Fig2Boundarycondition結(jié)果Results無。性能要求PerformanceRequirements第一階整體模態(tài)大于35Hz，質(zhì)量大于1Kg的附件一階模態(tài)大于30Hz。The1stmodeisabove35Hz,