前地板上的中通道刚度分析规范

Q/SZJ191001-2017Q/SZC1-010-2015前地板上的中通道刚度分析规范SpecificationOfStiffnessAnalysisForFrontFloorConsole20XX20XX-06-30实施20XX-05-29发布XXXX汽车工程技术有限公司发布Q/SZXX-X-2017前地板上的中通道刚度分析规范范围本标准规定了前地板上的中通道刚度分析的分析方法，以确定整车中中通道的刚度。本标准适用于CAE部门前地板上的中通道刚度分析。规范性引用文件无。术语和定义无。流程图PROCESSFLOWDIAGRAM建模Model建模Model1stmode>35Hz截取车身CutBIW约束边界Boundary设置参数计算Setparameter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):nastran101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ModelingTechniques建模使用壳单元截取一个带console的车身模型Modelconsolemountingbracketryandplastichousingusingshellelements.Acquireabodymodelsotheconsolecanmounttoit.假设和限制ASSUMPTIONS/LIMITATIONS以上截取的车身刚度等同整车刚度阻尼对分析无影响Theportionofthevehicledescribedaboverepresentsthevehiclestiffness.Dampingforcesareinsignificanttothisanalysis.约束和边界条件CONSTRAINTS/BOUNDARYCONDITIONS取一个整车模型去除前机舱和A柱。约束边界1-6。去除前围板和一部分后地板，约束边界1-6。去除Z向300-400以上高度的所有单元，约束边界1-6Startwithafullvehiclebodymodel.RemoveforwardandverticalofFrontBodyHingePillar.ApplySPC’sof123456atthisedge.Removedashpanels.CuttheBodyInWhitemodelwherefloorpanandrearfloorpanjoin.ConstrainthisedgewithSPC’sof123456.Cutmodelabout300to400mmverticallyonbpillar.ConstrainthisedgewithSPC’sof123456.Constrainthefrontedgeofthefloorpan.Thiswillisolatetheconsolemodeswhendoingthemodalanalysis.Seefigurebelow.Console侧板下边缘约束246自由度，console前端边缘的约束必须由其安装在上面的附件的结构所决定。SPCthebottomedgeofthesidepanelswithaDOFof246tosimulatecontactbetweenpanelandtunnel.Thiswillstopanyfalseflappingofsidepanelsinmodalanalysis.ThefrontedgeconstraintconditionisdependentonwhattypeofattachmentstherearebetweentheIPandConsolestructure.Seethefigurebelow图2边界约束Fig2Boundarycondition载荷LOADS计算console静刚度时，在console扶手箱上表面中心位置向下25mm的点，作为加载点（该加载点和console在车身上的后安装支架在一直线上）加载侧向（Y）200N的载荷，测量该点的位移。计算刚度。计算静刚度时，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侧向刚度大于40N/mm对于扶手箱滥用力分析，扶手箱、铰链、console结构不允许出现屈服，如果应力大于屈服，要用非线性进一步计算，塑性应变小于3%Onthecrosscarstiffnessmeasurement,thetargetwas40N/mmOnthearmrestabuseload,thestressesonthearmrest,hingeandconsolestructureshouldbelessthanyield.Ifthestressesareaboveyield,onewillhavetouseanon-linearanalysissoftwarecodetoretrieveplasticstrains.Plasticstrainsbelow2%areacceptable.From2to3%ismarginal.Greaterthan3%isunacceptable