Q/SZJ191001-2017前保險(xiǎn)杠(車身)模態(tài)分析規(guī)范SpecificationOfModalAnalysisForFrontFasciaVehicle20XX20XX-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前保險(xiǎn)杠（車身）模態(tài)分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了前保險(xiǎn)杠（車身）模態(tài)分析的分析方法，確定整車中前保險(xiǎn)杠模態(tài)。本標(biāo)準(zhǔn)適用于CAE部門前保險(xiǎn)杠（車身）模態(tài)分析。規(guī)范性引用文件無(wú)。術(shù)語(yǔ)和定義無(wú)。流程圖PROCESSFLOWDIAGRAM建模Model建模ModelMeettarget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Figure1ProcessFlowDiagram工具描述TOOLDESCRIPTION仿真分析過(guò)程中需要用到的如下軟件:Thefollowingsoftwarefacilitatestheanalyticalsimulationprocess:前處理(Preprocessors):Hypermesh求解器(AnalysisCode):nastran101后處理(Postprocessors):HyperView建模和分析過(guò)程MODELING/ANALYSISPROCEDURE單位Units分析中所用單位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) N質(zhì)量(Mass) Ton長(zhǎng)度(Length) mm時(shí)間(Time) s內(nèi)容Contents坐標(biāo)系CoordinateSystems建模技巧ModelingTechniques建模僅可能使用殼單元模型截取A柱之后1200mm（或者靠近B柱前側(cè)位置），截取模型邊界約束1-3自由度ModelusingPlateelements.UsetheportionofthevehicleBIWmodel250MMforwardofthe“A”pillarand1200MMrearwardof“A”Pillar(orjustforwardofthe“B”Pillar).Thecut-offsectionsoftheBIWmodelareconstrainedwithDOF123.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(wú)影響Theportionofthevehicledescribedaboverepresentsthevehiclestiffness.Dampingforcesareinsignificanttothisanalysis.約束和邊界條件CONSTRAINTS/BOUNDARYCONDITIONS約束截取車身模型處邊界1-3自由度ConstrainthecutsectionsofthebodymodelwithDOF123.圖2邊界約束Fig2Boundarycondition載荷LOADS[載荷描述]N/A性能要求PERFORMANCEREQUIREMENTS整體第一階模態(tài)大于25Hz,第一階格柵模態(tài)大于25Hz,第一階霧燈模態(tài)大于35Hz。1stglobalfasciaresonantfrequencyisgreaterthan25Hz,1stfasciaintegratedgrilleresonantfrequencyisgreaterthan25Hz,1stfasciaintegratedfoglampresonantfrequencyisgreaterthan35Hz.分析要求ANALYSISREQUIREMENTS時(shí)間歷程節(jié)點(diǎn)TimeHistoryNodes無(wú)。輸出文件OutputFiles輸出模態(tài)：整體（呼吸/上下/扭轉(zhuǎn)）格柵（呼吸/上下/扭轉(zhuǎn)）霧燈ModeMapofNaturalResonantFrequencyof:Fascia(breathing,up/down,twist)Grille(breathing,up/down,twist)Foglamp分析時(shí)長(zhǎng)AnalysisDuration無(wú)。結(jié)果RESULTS結(jié)果格式ResultsFormatsOP2