Q/SZJ191001-2017轉(zhuǎn)向管柱支撐結(jié)構(gòu)的剛度分析規(guī)范SpecificationofSteeringColumnSupportStructureAnalysis20XX20XX-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轉(zhuǎn)向管柱支撐結(jié)構(gòu)的剛度分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了術(shù)語(yǔ)和定義、轉(zhuǎn)向管柱支撐結(jié)構(gòu)的剛度分析方法及結(jié)果處理方法。本標(biāo)準(zhǔn)適用于CAE部門轉(zhuǎn)向管柱支撐結(jié)構(gòu)的剛度分析規(guī)范。規(guī)范性引用文件無(wú)。術(shù)語(yǔ)和定義無(wú)。摘要Abstract本文介紹轉(zhuǎn)向管柱支撐結(jié)構(gòu)的剛度分析規(guī)范。Thedocumentoutlinesthespecificationofsteeringcolumnsupportstructurestiffnessanalysis.流程圖ProcessFlowDiagram建模建模Modeling結(jié)果是否滿足要求Istheresultok?定義邊界條件DefineBoundary分析計(jì)算Calculation結(jié)束ENDYESNO優(yōu)化Optimization定義載荷Defineloads圖1流程圖Fig1ProcessFlowDiagram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):SOFYBSPA求解器(AnalysisCode):NASTRAN后處理(Postprocessors):SOFYBSPA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) 牛頓(N)質(zhì)量(Mass) 噸(Ton)長(zhǎng)度(Length) 毫米(mm)時(shí)間(Time) 秒(Second)內(nèi)容Contents轉(zhuǎn)向管柱支撐結(jié)構(gòu)包含整個(gè)儀表板結(jié)構(gòu)。通常，它還包括一個(gè)橫向的梁和轉(zhuǎn)向管柱的局部安裝支架。轉(zhuǎn)向管柱支撐結(jié)構(gòu)有兩種不同的模型形式。一種稱為Front-of-Dash(FOD)模塊，具體可以參考《儀表板模態(tài)分析規(guī)范》中所述。本文主要介紹第二種建模方式，車身車架一體的建模方式。它將整備車身轉(zhuǎn)化為超單元表示，避免了在儀表板附近的車身上引入人為的約束，提高了計(jì)算精度。轉(zhuǎn)向管柱支撐結(jié)構(gòu)的剛度計(jì)算模型需要包含以下子系統(tǒng)：整備車身、儀表板、轉(zhuǎn)向管柱和方向盤。ThesteeringcolumnsupportstructureincludestheentireInstrumentPanel(IP)structure.Typically,thiswouldincludeacross-vehiclebeamanda“l(fā)ocal”mountingbracketforthesteeringcolumn.Therearetwomethodstobuildthemodelofsteeringcolumnsupportstructure.ThefirstoneiscalledaFront-of-Dash(FOD)buckstructure,whichcanbereferredtothedetailsof“InstrumentPanelStructure/AssemblyModalAnalysis”.Thisdocumentismainlyaboutthesecondmethod,whichisaBFI(BodyFrameIntegral)structure.TherecommendedtechniqueforFullVehicleN&VCAEistoconverttheentiretrimbodymodeltoasuperelement.ThisavoidsputtingartificialconstraintsonthebodystructureneartheIP;hence,accuracywillbeimproved.Thesteeringcolumnsupportstructureincludethesubsystemsoftrimmedbody,instrumentpanel,steeringcolumnandsteeringwheel.坐標(biāo)系CoordinateSystems全局坐標(biāo)系Theglobalstandardcoordinationsystem建模技巧ModelingTechniquesN/A假設(shè)和限制Assumptions/LimitationsN/A載荷和邊界條件Loads/BoundaryConditions約束和邊界條件Constraints/BoundrayConditions以下所述流程應(yīng)用于約束車身-車架一體的結(jié)構(gòu)：在前減振器的左右兩支座，各建一個(gè)RBE2。RBE2的主動(dòng)點(diǎn)位于減振器支座的中心，選支座圓周的兩圈節(jié)點(diǎn)作為從動(dòng)點(diǎn)。約束該RBE2的1-6自由度。在RBE2的中點(diǎn)作用邊界條件SPC123。用同樣的方式為后懸的左右彈簧支座作用邊界條件，如圖2。另外，應(yīng)該限制轉(zhuǎn)向管柱的轉(zhuǎn)動(dòng)。在轉(zhuǎn)向軸的底部作用一個(gè)SPC（在轉(zhuǎn)向管柱局部坐標(biāo)系下），限制繞軸的轉(zhuǎn)動(dòng)。ThefollowingprocedureshouldbeusedtoconstrainaBFI(BodyFrameIntegral)structure.Attheleftandrightfrontstrut(shock)towers,buildanRBE2spider.PuttheIndependentgridatthecenterofthestruttoweropening.Select2rowsofnodesaroundthecircumferenceofthestruttoweropeningastheDependentgrids.UsetheRBE2toconstrainDOF1-6oftheDependentgrids.SPCDOF1-3oftheIndependentgrid.Usetheaboveprocedurefortheleftandrightspringseatsfortherearsuspension,asshowninFigure2.Inaddition,thesteeringcolumnshaftshouldnotbeallowedtorotate.ApplyonlyoneSPC(inthelocalcoordinatesystemofthesteeringcolumn)atthebottomofthesteeringcolumnshafttopreventitfromrotatingaboutitsaxis.圖2約束和邊界條件Fig2ConstraintandBoundaryConditions載荷Loads在轉(zhuǎn)向管柱頂端中心點(diǎn)垂向側(cè)向1000N的集中載荷。Applyspecifiedconcentratedverticalandlateralforcesatthetopcenterofthesteeringcolumnrepresentation.結(jié)果ResultsN/A性能要求