内饰车身振动传递函数分析规范

Q/SZJ191001-2017内饰车身振动传递函数分析规范SpecificationOfVibrationTransferFunctionAnalysisForTrimmedBody20XX20XX-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内饰车身振动传递函数分析规范范围本标准规定了术语和定义、内饰车身振动传递函数方法及结果处理方法。本标准适用于CAE部门的内饰车身振动传递函数分析。规范性引用文件无。术语和定义无。摘要Abstract振动传递函数考察结构中输出点对输入点的响应敏感度。输出点通常为方向盘（SteeringWheel）及驾驶员座椅滑轨（SeatTrack），因为两处都将直接影响驾乘者的感受。本规范规定了振动传递函数分析的方法要求及评价标准。Thevibrationtransferfunctionisusedtoinvestigatethesensitivityoftheoutputpointstotheinputpoints.OutputvelocityresponseinX,Y,Zdirectionatwheelandseatpoints,Becausethetwodirectlyaffectthefeelingsoftheride.requirementsandEvaluationstandardfortheanalysisoftheVibrationTransferFunction.

流程图ProcessFlowDiagram收集详细模型收集详细模型(TrimmedBody)CollectDetailedModels(TrimmedBody)设置边界条件和载荷SettheboundaryConstraintsandLoads提交计算NastranSOL111RunNastranSOL111结果后处理（HyperGraph）Resultsprocessing（HyperGraph）输出方向盘与驾驶员座椅导轨安装处的响应点XYZ速度响应OutputvelocityresponseinX,Y,Zdirectionatwheelandseatpoints结束End优化Optimization结果是否满足要求？IstheresultOK？YesNo评价标准Evaluationstandard图1流程图Fig1ProcessFlowDiagram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):MSC.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) 牛顿(N)质量(Mass) 吨(Ton)长度(Length) 毫米(mm)时间(Time) 秒(Second)内容Contents结构有限元模型是带内饰车身的TrimmedBody模型（以下简称TB模型），TB模型按照是否带副车架又分为不带副车架的TB模型和带副车架的TB模型两种。StructurefiniteelementmodelsistheTrimmed-Bodymodelswithinteriorbody(hereinafterreferredtoasTBmodel).theTBmodelcanbedividedintotwokinds,onewithasub-frameandtheotherwithoutasub-frame.副车架与车身的连接是软连接通过衬套连接的，使用不带副车架的TB模型进行VTF分析。图2是不带副车架的VTF分析有限元模型。Onthesituationtheconnectionbetweenthesub-frameandthebodyissoft,useTBmodelwithoutasub-frametodoNTFanalysis.Thefiniteelementmodelwithoutasub-frameusedinNTFanalysisisshowinfigure2.图2不带副车架的VTF有限元模型Fig2ThefiniteelementmodelwithoutsubframeinVTF车架与车身连接是硬连接通过螺栓连接的，使用带副车架的TB模型进行VTF分析。图3是带副车架的VTF分析有限元模型。Whenthesubframeandbodyisconnectedbythehardbolts,VTFanalysisusesaTBmodelwithsub-frame.Figure3showsafiniteelementmodelwithsub-frameinVTFanalysis.图3带前后副车架的有限元模型Fig3Thefiniteelementmodelwithfrontandrearsub-frames坐标系CoordinateSystems分析采用整车坐标系,有些弹簧需要建局部坐标系。Analysisusesvehicleglobalcoordinatesystem,Localcoordinatesystemsareneededforsomespringsinthetrimmedbody.建模技巧ModelingTechniques请参阅TrimmedBodyRefertotheTrimmedBodymodelingguidelines.接附点的衬套直接用螺栓与车身侧连接时，需要建立一维CBEAM或CBAR单元螺栓模型，如摆臂接附点，见图4所示。加载点在CBEAM或CBAR单元的中点。Onthesituationthebushismodeledasaboltconnectedtothebody,a1DCBEAMelementorCBARelementcanbeusedtomodelthebolt.Forinstance,anattachmentpointattheswingarmisshowedinFigure4.TheloadingpointisatthemiddlelocationofCBEAMorCBAR.图4衬套直接用螺栓与车身侧连接的建模示意图Fig4Bushingasabolt接附点的衬套以支架总成形式与车身侧连接时，需要将固定衬套橡胶的钢圈用RBE2单元连接，钢圈中心点为RBE2主节点，钢圈上节点为RBE2从节点，RBE2单元耦合全部6个自由度。加载点在RBE2主节点，如发动左悬置接附点见图5所示。Onthecircumstancethemountingpointbushispresentedbyabracketassemblyconnectedtothebodyside,aRBE2elementshouldbeusedtomodeltherimsonthefixedbushingrubber.Theindependentnodeisthecenterofrim,andtheindependentnodesconnectthewholerim.TheRBE2coupledall6degreesoffreedoms.TheloadisimposedontheindependentnodeofRBE2.Forinstance,theleftenginemountpointisasshowninFig5.图5发动机左悬置接附点建模示意图Fig5Theleftenginemountmodeling如图6所示，为前、后减振弹簧安装支座处接附点建模方式，其加载点为前后减振弹簧支座中心点。ThemodelingmethodoffrontandreardampingspringinstallationsupportsisshowedinFigure6.Theloadingpointisthecenterpointofsprings.图6前、后减振弹簧接附点建模示意图Fig6frontandreardampingSpringsmodeling车身侧排气系统接附点的建模方式为，将被动侧挂钩与挂钩隔振器相连的区域的节点用RBE2单元的从节点连接，主节点自动生成，RBE2单元耦合全部6个自由度。加载点在RBE2单元的主节点。图7是车身侧排气系统接附点的建模示意图。Bodysideexhaustsystemmodelingmethod：TheRBE2isusedtomodelthemountingpoint,withitsdependentnodesconnectingthenodesontheregionwhichrelatedthepassivelinktothelinkisolator,whileitsindependentnodeisautomaticallygenerated.TheRBE2couplesall6degreesoffreedom.Itsindependentnodeistheloadingpoint.Figure7showsthebody-sideexhaustsystemmodeling.图7车身侧排气系统接附点建模示意图Fig7Thebody-sideexhaustsystemmodeling假设和限制Assumptions/Limitations无。载荷和边界条件Loads/BoundaryConditions约束：自由模态。Noconstraints.包括底盘悬架系统与车身相连的接附点、发动机与车身相连的接附点、副车架与车身相连的接附点、排气与车身相连的接附点。不同车型间可能因为底盘悬架系统、发动机安装方式、副车架连接和排气系统的不同，而存在差异。图8为接附点位置示意图，其中副车架、前悬、后摆臂、后减振器、后弹簧安装点、排气吊挂安装点。Includeschassissystemandvehiclebodyattachmentpoints,engineandbodyattachmentpoints,sub-frameandbodyattachmentpoints,exhaustandbodyattachmentpoints.Betweendifferentmodelsbecausethechassissuspensionsystems,engineinstallation,connectedtotheframeandexhaustsystemsofdifferent,therearedifferences.Figure8-mountpoints,subframe,frontsuspension,rearswingarm,rearshockabsorbers,rearspringmountingpoint,exhaustsuspensionattachmentpoints.图8接附点位置示意图Fig8mountpoints加载：在接附点处分别沿XYZ三个方向，加载1N随频率（2Hz~200Hz）变化的动载荷。Apply1NineachX,Y,Zdirectionateachinputpoint,andfrequencyfrom2Hzto200Hz;方向和接附点的受力方向一致。接附点受力方向如果与整车坐标不一致，需要根据受力方向建立局部坐标，如摆臂接附点。图9是局部坐标、整车坐标示意图。Applytheloadintheattachmentpointsforceddirection.Iftheloadingdirectionisinconsistentwiththeglobalcoordinatesystem,thelocalcoordinatesystemisneeded.anattachmentpointattheswingarmisshowedinFigure8.Figure8showsthelocalandglobalcoordinatesystems.图9局部坐标、整车坐标示意图Fig9Thelocalcoordinatesystemandtheglobalcoordinatesystem载荷大小：单位载荷1N。Load:unitload1N模态阻尼：1-20Hz是0.1，20－500Hz是0.04；Modaldamping:1-20Hzwas0.1,20-500Hzwas0.04;载荷激励频率范围：2Hz－200Hz；Loadexcitationfrequencyrange:50Hz－500Hz；结构模态频率范围：0Hz－500Hz；Structuralmodalfrequencyrange:0Hz－500Hz求解采用NASTRAN模态频率响应SOL111。Solver111具体的参数设置详见15.例子Specificparametersettingsisshowninchapter15EXAMPLES.结果Results输出方向盘与驾驶员座椅导轨安装处的响应点XYZ速度响应OutputvelocityresponseinX,Y,Zdirectionatwheelandseatpoints.图10响应点Fig10ResponsePoints图11振动传递函数分析结果(方向盘响应点)Fig11VTFAnalysisofresults（wheelresponsepoints）图12振动传递函数分析结果(座椅响应点)Fig12VTFAnalysisofresults（seatresponsepoints）性能要求PerformanceRequirementsVTF分析必须使用满足分析的有限元模型目标值：10~200Hz之间，座椅导轨处为0.07mm/s/N，方向盘处为0.25mm/s/N。针对不同车型定位不同，目标值可根据具体项目要求进行调整。TheVTFanalysesmustusemodelsthatmeetapplicablefiniteelementmodelingprocedures.Target:0.07mm/s/Natseatrail;0.25mm/s/Natwheelbetween10~200Hz.Thetargetvaluecanbeadjustedaccordingtothespecificprojectrequirements.分析要求ANALYSISREQUIREMENTS参考文件DOCUMENTATION无。联系人CONTACTS无。例子EXAMPLESs$$SOL111DOMAINSOLVERACMS(PARTOPT=DOF,PRINT=YES)CEND$$$$$CaseControlCards$$$$$TITLE=A10VTFAUTOSPC(NOPRINT)=YESECHO=NONEMETHOD(STRUCTURE)=10FREQ=30SDAMPING=40$$$$$SetsList$$$$$$$$NodeSETforOutputaboveAllSubcases.SET1=8000,8002,8003,8006,8009,8012,8004$$DISP(PLOT)=1VELO(PLOT)=1ACCE(PLOT)=1$$SubcaseFLTOPMTG,N1010_COMP-1SUBCASE1073LABEL=FLTOPMTG_N1010_COMP-1DLOAD=1073$$==================================================