Q/SZJ191001-2017Q/SZC1-010-2015前地板上的中通道剛度分析規(guī)范SpecificationOfStiffnessAnalysisForFrontFloorConsole20XX20XX-06-30實(shí)施20XX-05-29發(fā)布XXXX汽車工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017前地板上的中通道剛度分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了前地板上的中通道剛度分析的分析方法，以確定整車中中通道的剛度。本標(biāo)準(zhǔn)適用于CAE部門前地板上的中通道剛度分析。規(guī)范性引用文件無。術(shù)語和定義無。流程圖PROCESSFLOWDIAGRAM建模Model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Figure1ProcessFlowDiagram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):nastran101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) N質(zhì)量(Mass) Ton長度(Length) mm時(shí)間(Time) s內(nèi)容Contents坐標(biāo)系CoordinateSystems建模技巧ModelingTechniques建模使用殼單元截取一個(gè)帶console的車身模型Modelconsolemountingbracketryandplastichousingusingshellelements.Acquireabodymodelsotheconsolecanmounttoit.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分析無影響Theportionofthevehicledescribedaboverepresentsthevehiclestiffness.Dampingforcesareinsignificanttothisanalysis.約束和邊界條件CONSTRAINTS/BOUNDARYCONDITIONS取一個(gè)整車模型去除前機(jī)艙和A柱。約束邊界1-6。去除前圍板和一部分后地板，約束邊界1-6。去除Z向300-400以上高度的所有單元，約束邊界1-6Startwithafullvehiclebodymodel.RemoveforwardandverticalofFrontBodyHingePillar.ApplySPC’sof123456atthisedge.Removedashpanels.CuttheBodyInWhitemodelwherefloorpanandrearfloorpanjoin.ConstrainthisedgewithSPC’sof123456.Cutmodelabout300to400mmverticallyonbpillar.ConstrainthisedgewithSPC’sof123456.Constrainthefrontedgeofthefloorpan.Thiswillisolatetheconsolemodeswhendoingthemodalanalysis.Seefigurebelow.Console側(cè)板下邊緣約束246自由度，console前端邊緣的約束必須由其安裝在上面的附件的結(jié)構(gòu)所決定。SPCthebottomedgeofthesidepanelswithaDOFof246tosimulatecontactbetweenpanelandtunnel.Thiswillstopanyfalseflappingofsidepanelsinmodalanalysis.ThefrontedgeconstraintconditionisdependentonwhattypeofattachmentstherearebetweentheIPandConsolestructure.Seethefigurebelow圖2邊界約束Fig2Boundarycondition載荷LOADS計(jì)算console靜剛度時(shí)，在console扶手箱上表面中心位置向下25mm的點(diǎn)，作為加載點(diǎn)（該加載點(diǎn)和console在車身上的后安裝支架在一直線上）加載側(cè)向（Y）200N的載荷，測量該點(diǎn)的位移。計(jì)算剛度。計(jì)算靜剛度時(shí)，在扶手箱上垂向均布890N的合力。Forconsolestaticanalysis,applyaprogramspecificload(e.g.200N)crosscarload,programspecificdisplacement(e.g.25mm)belowthetopofthearmrest.Applytheloadsoitisdirectlyinlinewiththerearconsolebodybracket.Measurethedisplacementatthepointofloadapplication.CalculatethestiffnessForthestaticanalysis,distributeaprogramspecificload(e.g.200lb.(890N))loadonthearmrest.性能要求PERFORMANCEREQUIREMENTSconsole側(cè)向剛度大于40N/mm對于扶手箱濫用力分析，扶手箱、鉸鏈、console結(jié)構(gòu)不允許出現(xiàn)屈服，如果應(yīng)力大于屈服，要用非線性進(jìn)一步計(jì)算，塑性應(yīng)變小于3%Onthecrosscarstiffnessmeasurement,thetargetwas40N/mmOnthearmrestabuseload,thestressesonthearmrest,hingeandconsolestructureshouldbelessthanyield.Ifthestressesareaboveyield,onewillhavetouseanon-linearanalysissoftwarecodetoretrieveplasticstrains.Plasticstrainsbelow2%areacceptable.From2to3%ismarginal.Greaterthan3%isunacceptable