Q/SZJ191001-2017NVH穩(wěn)定桿模型建模規(guī)范ModelingSpecificationOfStabilizerBarforNVH20XX20XX-XX-XX實(shí)施20XX-XX-XX發(fā)布XXXX汽車工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017NVH穩(wěn)定桿模型建模規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了NVH穩(wěn)定桿建模方法。本標(biāo)準(zhǔn)適用于CAE部門穩(wěn)定桿NVH模型建模。規(guī)范性引用文件下列文件對于本文件的應(yīng)用是必不可少的。凡是注日期的引用文件，僅注日期的版本適用于本文件。凡是不注日期的引用文件，其最新版本（包括所有的修改單）適用于本文件。有限元網(wǎng)格建模規(guī)范CAE整車模型命名規(guī)范NVH整車模型編號規(guī)范術(shù)語和定義無。摘要Abstract穩(wěn)定桿通過穩(wěn)定桿拉桿到連接左右懸架,并通過橡膠襯套固定在副車架的兩側(cè)。穩(wěn)定桿兩端連接到左和右兩側(cè)的穩(wěn)定桿拉桿。穩(wěn)定桿拉桿的另一端連接到下控制臂（LCA）或轉(zhuǎn)向節(jié)，另一端連接到穩(wěn)定桿。大多數(shù)汽車來說，穩(wěn)定桿和拉桿之間用球鉸連接，同樣，穩(wěn)定桿與LCA或轉(zhuǎn)向節(jié)之間也用球鉸連接。Thestabilizerbarconnectstheleftandrightsidesofthesuspensionthroughdroplinksandissecuredtothetwosidesofthecradlewithrubberisolation.Stabilizerbarendsareconnectedtothedroplinksonleftandrightsides.Oneendofthedroplinkisconnectedtothelowercontrolarm(LCA)orknuckledependingonthesuspensionandtheotherendisattachedtothestabilizerbar.Mostofthevehicleshaveballjointsbetweenthedroplinkandstabilizerbar,andalsobetweenthedroplinkandtheLCAorknuckle.穩(wěn)定桿的功能是最小化汽車側(cè)滾甚至消除汽車側(cè)滾。Thefunctionofthisstabilizerbaristominimizeoreliminatetherolloverofthevehicle.本文介紹了用于噪聲和振動(dòng)分析的穩(wěn)定桿的建模過程。該模型可與車系統(tǒng)模型中的其它組件和子系統(tǒng)模型結(jié)合使用。Thisdocumentdescribestheproceduresformodelingthestabilizerbarfornoiseandvibrationanalysis.Themodelcanbeusedincombinationwithothercomponentandsubsystemmodelsinafull-vehiclesystemmodel.流程圖ProcessFlowDiagram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):MSC.Nastran后處理(Postprocessors):HyperView建模和分析過程Modeling/AnalysisProcedure該模型必須符合噪聲振動(dòng)有限元模型建模標(biāo)準(zhǔn)。ThismodelshouldconformtotheNoiseandVibrationModelingStandardsforFEModels.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)長度(Length) 毫米(mm)時(shí)間(Time) 秒(Second)內(nèi)容Contents在穩(wěn)定桿有限元模型中常見的組件如下:穩(wěn)定桿、穩(wěn)定桿拉桿、穩(wěn)定桿與副車之間的襯套、球鉸。圖2和3前后懸架所有穩(wěn)定桿組件。ThecomponentsthatarecommonlyfoundinthestabilizerbarFEAmodelareasfollows:Stabilizerbar,Droplinks,Stabbarbushingsbetweencradleandstabbar,andBalljoints.Figures2and3belowshowallthecomponentsrelatedtothestabilizerbarinthefrontandrearsuspensions.圖2前懸穩(wěn)定桿圖3多連桿結(jié)構(gòu)后懸穩(wěn)定桿坐標(biāo)系CoordinateSystems有限元網(wǎng)格需要在整車坐標(biāo)系建模。TheFEAmodelshouldbeconstructedintheglobalvehiclesystem.穩(wěn)定桿襯套通常不與全局坐標(biāo)方向?qū)R。如果是這樣，則必須建立相應(yīng)的局部坐標(biāo)系，并將相應(yīng)的節(jié)點(diǎn)或網(wǎng)格賦予該坐標(biāo)系。Thestabilizerbarbushingsareusuallynotalignedwiththeglobalcoordinatedirections.Ifthisisso,thentheappropriatelocalcoordinatesystemsmustbeconstructed,andtheappropriategridsorelementsbeassignedtothissystem.材料屬性MaterialProperties材料規(guī)格應(yīng)從CAD零件文件中獲得,但應(yīng)準(zhǔn)確驗(yàn)證。MaterialspecificationsshouldbeobtainedfromtheCAD(ComputerAidedDesign)partfile,butshouldbeverifiedforaccuracy.文件管理Documentation參考文檔《有限元網(wǎng)格建模規(guī)范》。模型編號ModelNumbering參考文檔《NVH整車模型編號規(guī)范》。零件名管理PartNamingConventionandOrganization參考文檔《有限元網(wǎng)格建模規(guī)范》，《CAE整車模型命名規(guī)范》。建模技巧ModelingTechniques簡化模型建模技巧SimplifiedModelingTechniques穩(wěn)定桿的有限元網(wǎng)格可以用實(shí)體單元（六面體或四面體或三棱柱）或板/殼單元（四邊形和或三角形）或梁單元來建模。Afiniteelementrepresentationofthestabilizerbarcanbemodeledwitheithersolid(HexahedronorTetraand/orPenta)elements,orplate/shell(Quadrilateraland/orTriangular)elementsorbeamelements.簡化模型建模技巧SimplifiedModelingTechniques可以使用RBE2或CBEAM單元?jiǎng)?chuàng)建穩(wěn)定桿的簡化模型（見圖4）。通常，在較大的(整車級或子系統(tǒng))結(jié)果不嚴(yán)重依賴組件局部模態(tài)的情況下，這是可以接受的。在創(chuàng)建簡化模型時(shí)，應(yīng)注意它們具有具有代表性的質(zhì)量和慣量特性以及剛度特性。ItmaybedesirabletocreateasimplifiedmodelofthestabilizerbarusingRBE2orCBEAMelements(SeeFigure-4).Generally,thisisacceptablewherethelarger(vehiclelevelorsubsystem)modelresultsarenotcriticallydependentonlocalresonantmodesofthecomponentmodels.Careshouldbetakenwhenattemptingtocreatesimplifiedmodelssuchthattheyhaverepresentativemassandinertiaproperties,andstiffnesscharacteristics,whereflexuralelementsareused.圖4用BEAM單元建立的穩(wěn)定桿模型詳細(xì)模型建模技巧DetailedModelingTechniques更高頻率分析可能需要穩(wěn)定桿的詳細(xì)模型，它在較低頻率下需要更好的保真度。圖4顯示了板/殼單元的穩(wěn)定桿的建模。應(yīng)該注意的是,如果穩(wěn)定桿是一個(gè)堅(jiān)實(shí)的酒吧,它應(yīng)該建模固體元素(六面體和/或四面體和/或Pentahedron)。六面體單元是實(shí)體結(jié)構(gòu)建模的首選選擇。Detailedmodelsofthestabilizerbarmayberequiredforhigherfrequencyanalysis,orifbetterfidelityisrequiredatlowerfrequencies..Figure-4showsthemodelingofthestabilizerbarwithplate/shellelements.Itshouldbenotedthatifthestabilizerbarisasolidbar,itshouldbemodeledwithsolidelements(Hexahedronand/orTetrahedronand/orPentahedron).Thehexahedronelementisthepreferedchoiceformodelingofsolidstructures.圖5用殼單元建模的詳細(xì)模型穩(wěn)定桿拉桿建模ModelingofDropLinks可以用剛性單元或梁單元來建立簡化的穩(wěn)定桿拉桿模型?？梢杂脷卧?qū)嶓w單元來建立詳細(xì)的穩(wěn)定桿拉桿模型。假設(shè)和限制Assumptions/Limitations假設(shè)Assumptions這種建模方法假定所有組件的行為都是線性的。不模擬非線性行為。Thismethodofmodelingassumesallcomponentsbehaveinalinearfashion.Nonlinearbehaviorisnotsimulated.限制Limitations無。載荷和邊界條件Loads/BoundaryConditions無。結(jié)果Results無。性能要求PerformanceRequirements應(yīng)運(yùn)行自由模態(tài)分析來檢查模型，應(yīng)驗(yàn)證以下內(nèi)容：質(zhì)量、質(zhì)心和慣性值是合理的。存在六階小于0.1Hz的剛體模態(tài)。在所有剛體模態(tài)中,網(wǎng)格應(yīng)變能接近于零。所有的模型應(yīng)該有6階剛體模態(tài)，代表在X、Y、Z方向單獨(dú)存在或線性組合三個(gè)平移模態(tài)和三個(gè)旋轉(zhuǎn)模態(tài)。前5階柔性模態(tài)應(yīng)該顯示動(dòng)畫并加以分析，不存在明顯不連續(xù)的可疑的局部模態(tài)。所有警告信息都應(yīng)進(jìn)行檢查和驗(yàn)證。應(yīng)根據(jù)需要更正模型。Free-freenormalmodesanalysisshouldberuntocheckthemodel.Thefollowingshouldbeverified:Themass,C.G.,andinertiavaluesarereasonable.Thereshouldbesixrigidbodymodeswithnaturalfrequencieslessthan0.1Hz.Theelementstrainenergyshouldbeclosetozeroforallelementsforallrigidbodymodes.Thesixrigidbodymodesshouldrepresentboththethreetranslationalmodesandthreerotationalmodesinx,yandzdirections,individuallyorinlinearcombination.Thefirstfivefle