Q/SZJ191001-2017白車身扭轉(zhuǎn)剛度分析規(guī)范SpecificationOfTorsionStiffnessAnalysisForBodyIn-Prime20XX20XX-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-2017白車身扭轉(zhuǎn)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、白車身扭轉(zhuǎn)剛度分析方法及結(jié)果處理方法。本標(biāo)準(zhǔn)適用于CAE部門白車身扭轉(zhuǎn)剛度分析。規(guī)范性引用文件無(wú)。術(shù)語(yǔ)和定義本規(guī)范涉及到的術(shù)語(yǔ)及其定義如下：白車身（BIP）帶玻璃的白車身，在本規(guī)范中，部分還包括副車架，CCB等對(duì)車身起一定加強(qiáng)作用的零件或總成。摘要Abstract分析規(guī)范中的白車身是指包含風(fēng)窗玻璃的白車身，簡(jiǎn)稱BIP。其它用螺栓連接在白車身上并對(duì)剛度有顯著影響的子總成，如：副車架、座椅橫梁、下車體支架、CCB等，也要包含在內(nèi)。分析規(guī)范可用于以下類型的白車身結(jié)構(gòu)：承載式車身，主要用于乘用車；非承載式車身，主要用于商用車；分析工況如下：白車身靜態(tài)扭轉(zhuǎn)剛度；白車身前端扭轉(zhuǎn)剛度；白車身后端扭轉(zhuǎn)剛度；白車身開(kāi)口變形；Abody-in-prime(BIP)finiteelementNVHmodelisrequired.TheBIPmodelincludesbolt-oncomponentsexpectedtohaveasignificanteffectonstructurerigidity,e.g.bolt-onsub-frame,seatcross-members,underbodybraces,CCB.Thisproceduredescribeshowtodeterminethestaticstiffnessofthefollowingstructures:BFI(BodyFrameIntegral)body,whichistypicallyusedforcars;BOF(Bodyonframe)body,whichistypicallyusedfortrucks;Thefollowingstaticvaluesarecomputedforbodystructures:Globalstatictorsional(forcars)stiffness,racking(fortrucks)stiffness;Frontendtorsionstiffness;Rearendtorsionstiffness;Bodyopeningdiagonaldistortion;流程圖ProcessFlowDiagram組建詳細(xì)模型組建詳細(xì)模型Collectdetailedmodel(s)求解Solve加載Applyconstraintsandloads輸出位移并計(jì)算Outputdisplacementandcompute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):Hypermesh求解器(AnalysisCode):MSC.Nastran后處理(Postprocessors):Hyperview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)扭轉(zhuǎn)剛度單位轉(zhuǎn)換：Torsionalstiffnessunitconversion:內(nèi)容Contents模型包含白車身、翼子板、加強(qiáng)件、螺栓連接的橫梁、螺栓連接的副車架、前后風(fēng)窗玻璃、CCB等。Body-in-whitewith:fenders,reinforcingcomponents,boltedcrossmembers,withsub-frameifrigidly(bolted)connected,withandw/owindshield,CCB(crosscarbeam).坐標(biāo)系CoordinateSystems整車坐標(biāo)系Globalcoordinatesystem建模技巧ModelingTechniques無(wú)。假設(shè)和限制Assumptions/Limitations本規(guī)范僅用于靜態(tài)線性分析Theprocedureisapplicableonlytostaticlinearanalysis載荷和邊界條件Loads/BoundaryConditions白車身扭轉(zhuǎn)剛度BodyGlobalTorsionalStiffness約束Constrains：約束后懸減振彈簧支座和前碰撞橫梁中間底部位置。其中后左處約束XYZ，后右處約束XZ，前碰撞橫梁處約束Z。Constraintsareappliedatthecenterofrearshockcenterandthecenteroffrontbumperonbottomsurface.Theconstraineddegreeoffreedom:XYZ(Rearleft),XZ(Rearright),Z(Frontbumper).加載Loads：在左右前懸減振支座處加載一對(duì)方向相反大小相等的垂向力Fz，生成3000N.m的力矩（T=Fz×L=3000N.m，L是左右之間的距離）。AtorsionloadofFzand-FzisappliedatthecentersoffrontshocktowerinZdirectiontogenerate3000N.mtorque,i.e.T=Fz×L=3000N.m,whereLisdistancebetweentwocentersoffrontshocktowers.圖2扭轉(zhuǎn)示意圖Fig2TorsionDisplay白車身扭轉(zhuǎn)剛度(另一種方法)BodyGlobalTorsionalStiffness(OtherMethod)約束Constrains：約束后懸減振彈簧支座和前碰撞橫梁中間底部位置。其中后左處約束XYZ，后右處約束XZ，前碰撞橫梁處約束Z。Constraintsareappliedatthecenterofrearshockcenterandthecenteroffrontbumperonbottomsurface.Theconstraineddegreeoffreedom:XYZ(Rearleft),XZ(Rearright),Z(Frontbumper).加載Loads：在左右前懸減振支座處加載一對(duì)方向相反大小相等的垂向力Fz，生成1354N.m的力矩（T=Fz×L=1354N.m，L是左右之間的距離）。AtorsionloadofFzand-FzisappliedatthecentersoffrontshocktowerinZdirectiontogenerate1354N.mtorque,i.e.T=Fz×L=1354N.m,whereLisdistancebetweentwocentersoffrontshocktowers.圖3扭轉(zhuǎn)示意圖Fig3TorsionDisplay前端扭轉(zhuǎn)剛度FrontEndTorsionalStiffness約束Constraints:A柱與門檻連接處的上下焊接邊，長(zhǎng)度為100mm，約束XYZ。前碰撞橫梁中間底部位置，約束Z。Itisappliedatbothupperanddownflangesaftercurvesofrockerjointsinthelengthof100mm.Constraintsofdegree-of-freedom(DOF)X,Y,Z.Itisappliedatthecenteroffrontbumperonbottomsurface.Constraintsofdegree-of-freedom(DOF)Z.加載Loads:在前縱梁與碰撞盒連接處加載力矩3000N.m。Apairofoppositeforcesequivalenttoatorqueof3000N.misappliedatcenterofendsectionoffrontrail.圖4前端扭轉(zhuǎn)轉(zhuǎn)示意圖Fig4FrontEndTorsionalDisplay后端扭轉(zhuǎn)剛度RearEndTorsionalStiffness約束Constraints:A柱與門檻連接處的上下焊接邊，長(zhǎng)度為100mm，約束XYZ。后碰撞橫梁中間底部位置，約束Z。Itisappliedatbothupperanddownflangesaftercurvesofrockerjointsinthelengthof100mm.Constraintsofdegree-of-freedom(DOF)X,Y,Z.Itisappliedatthecenterofrearbumperonbottomsurface.Constraintsofdegree-of-freedom(DOF)Z.加載Loads:在后縱梁與碰撞盒連接處加載力矩3000N.m。Apairofoppositeforcesequivalenttoatorqueof3000N.misappliedatcenterofendsectionofrearrail.圖5后端扭轉(zhuǎn)示意圖Fig8RearEndTorsionalDisplay白車身開(kāi)口變形BodyOpeningDiagonalDistortion約束Constrains：與白車身扭轉(zhuǎn)剛度分析一致。Itissameasbodytorsionalstiffnessanalysis.加載Loads：與白車身扭轉(zhuǎn)剛度分析一致。Itissameasbodytorsionalstiffnessanalysis.圖6白車身開(kāi)口變形示意圖Fig6BodyOpeningDiagonalDistortionDisplay結(jié)果Results白車身扭轉(zhuǎn)剛度BodyGlobalTorsionalStiffness測(cè)量加載點(diǎn)在前縱梁和后縱梁中線處的投影點(diǎn)處（X值一致）變形，計(jì)算扭轉(zhuǎn)剛度。Thedeflectionismeasuredatthepointlocatedatthefrontlongitudinalandtherearlongitudinalatx-coordinates,whichareidenticaltothemiddleofthefrontshocktowerandtherearshocktower/thespringseat.Calculatingtorsionalstiffness.計(jì)算公式Computation：白車身扭轉(zhuǎn)剛度(另一種方法)BodyGlobalTorsionalStiffness(OtherMethod)測(cè)量加載點(diǎn)變形量，計(jì)算扭轉(zhuǎn)剛度。Thedeflectionismeasuredatthesamelocationwheretheloadisapplied.Calculatingtorsionalstiffness.計(jì)算公式Computation：前端扭轉(zhuǎn)剛度FrontEndTorsionalStiffness測(cè)量加載點(diǎn)變形量，計(jì)算扭轉(zhuǎn)剛度。Thedeflectionismeasuredatthesamelocationwheretheloadisapplied.Calculatingtorsionalstiffness.計(jì)算公式Computation：后端扭轉(zhuǎn)剛度RearEndTorsionalStiffness測(cè)量加載點(diǎn)變形量，計(jì)算扭轉(zhuǎn)剛度。Thedeflectionismeasuredatthesamelocationwheretheloadisapplied.Calculatingtorsionalstiffness.計(jì)算公式Computation：白車身開(kāi)口變形BodyOpeningDiagonalDistortion測(cè)量白車身開(kāi)口處焊接邊對(duì)角變形，計(jì)算開(kāi)口變形量。Thediagonaldistortionismeasuredandevaluatedbetweentwodiagonalgridpointsonflangesofthecornersatbodystructureopening.Calculateopeningdeformation.計(jì)算公式Computation：式中：isthedistancebetweentwodiagonalcornersbeforedistortion.變形前長(zhǎng)度isthedistancebetweenthesametwodiagonalcornersafterdistortion.變形后長(zhǎng)度性能要求PerformanceRequirements白車身輕量化要求BodyLightweightRequirements：輕量化系數(shù)計(jì)算公式如下。Lightweightdesignqualityfactorformulaisshownbelow.式中：——白車身質(zhì)量（不包括閉合件和前后風(fēng)窗玻璃），單位Kg。Bodyweight(withoutclosuresandglass,BIW),unitKg.——白車身扭轉(zhuǎn)剛度（包含前后風(fēng)窗玻璃），單位N.m/deg。Bodytorsionalstiffnesswithglass(BIP),unit:N.m/deg.——四輪間的正投影面積，即平均輪距乘以軸距，單位m^2。Effectivestandingarea(averagetrackXwheelbase),unit:m^2.圖7白車身投影面積示意圖Fig7BodyEffectiveStandingAreaDisplay白車身開(kāi)口變形性能要求BodyDiagonaldistortionrequirements：詳見(jiàn)表1。Seetable1.表1白車身開(kāi)口變形性能要求Table1BodyDiagonalDistortionRequirements序號(hào)ID測(cè)量位置MeasurementLocation要求RequirementsAFrontDoor(TopA-pillartoBottomofB-pillar)≤0.50BFrontDoor(TopofB-pillartoBottomofA-pillar)≤0.30CRearDoor(TopofB-pillartoBottomofC-pillar)≤0.45DRearDoor(TopofC-pillartoBottomofB-pillar)≤0.40ELiftgate≤1.10F=E≤1.10G=C≤0.45H=D≤0.40I=A≤0.50J=B≤0.30分析要求ANALYSISREQUIREMENTS無(wú)。參考文件DOCUMENTATION無(wú)。聯(lián)系人CONTACTS無(wú)。例子EXAMPLES$$$$$ExecutiveControlCards$$$$SOL101CEND$$$$$CaseControlCards$$$$DISPLACEMENT(PLOT)=ALL$$HMNAMELOADSTEP1"BEND_STEP"SUBCASE1LABEL=BEND_STEPSPC=1LOAD=2ANALYSIS=STATICS$$HMNAMELOADSTEP2"TOR_STEP"SUBCASE2LABEL=TOR_STEPSPC=3LOAD=4ANALYSIS=STATICS$$$$$BulkDataCards$$$$BEGINBULKPARAM,POST,-1$$DATA$$$$$$$LoadsandBoundaryConditions$$$$$$$HMNAMELOADCOL1"BEND_SPC"$HWCOLORLOADCOL12$$HMNAMELOADCOL2"BEND_FORCE"$HWCOLORLOADCOL26$$HMNAMELOADCOL3"TOR_SPC"$HWCOLORLOADCOL34$$HMNAMELOADCOL4"TOR_FORCE"$HWCOLORLOADCOL48$$$$$$$SPCData$$SPC110000001230.0SPC15510130.0SPC11010230.0SPC1151030.0SPC310000001230.0SPC35510130.0SPC39338117230.0$$$$FORCEData$$FORCE29338117301.00.00.0-250.0FORCE29338117401.00.00.0-250.0FORCE29338117501.00.00.0-250.0FORCE29338117