白车身弯曲刚度分析规范

Q/SZJ191001-2017白车身弯曲刚度分析规范SpecificationOfBendingStiffnessAnalysisForBodyIn-Prime20XX20XX-XX-XX实施20XX-XX-XX发布XXXX汽车工程技术有限公司发布Q/SZXX-X-2017白车身弯曲刚度分析规范范围本标准规定了白车身弯曲刚度分析的分析方法及结果处理方法。本标准适用于CAE部门白车身弯曲刚度分析。规范性引用文件无。术语和定义本规范涉及到的术语及其定义如下：白车身（BIP）带玻璃的白车身，在本规范中，部分还包括副车架，CCB等对车身起一定加强作用的零件或总成。摘要Abstract分析规范中的白车身是指包含风窗玻璃的白车身，简称BIP。其它用螺栓连接在白车身上并对刚度有显著影响的子总成，如：副车架、座椅横梁、下车体支架、CCB等，也要包含在内。分析规范可用于以下类型的白车身结构：承载式车身，主要用于乘用车；非承载式车身，主要用于商用车；分析工况如下：白车身静态扭转刚度；白车身前端扭转刚度；白车身后端扭转刚度；白车身开口变形；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;流程图组建详细模型组建详细模型Collectdetailedmodel(s)求解Solve加载Applyconstraintsandloads输出位移并计算Outputdisplacementandcompute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):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模型包含白车身、翼子板、加强件、螺栓连接的横梁、螺栓连接的副车架、前后风窗玻璃、CCB等。Body-in-whitewith:fenders,reinforcingcomponents,boltedcrossmembers,withsub-frameifrigidly(bolted)connected,withandw/owindshield,CCB(crosscarbeam).坐标系CoordinateSystems整车坐标系Globalcoordinatesystem建模技巧ModelingTechniques无。假设和限制Assumptions/Limitations本规范仅用于静态线性分析Theprocedureisapplicableonlytostaticlinearanalysis载荷和边界条件Loads/BoundaryConditions白车身弯曲刚度Bodyglobalbendingstiffness约束Constrains对于乘用车，约束前后悬减振弹簧支座位置；对于商用车，约束第1和第4个车架安装点。其中前左处约束YZ自由度，前右处约束Z自由度，后左处约束XYZ自由度，后右处约束XZ自由度。Forcars,itisappliedatbothfrontandrearshocktower.Fortruckcabs,itisappliedat#1and#4bodymounts.Theconstraineddegreeoffreedom:YZ(Frontleft),Z(Frontright),XYZ(Rearleft),XZ(Rearright).加载Loads对于承载式车身结构，在每个前排座椅上加载1000N的垂向力，则对于有4个安装点的前座椅，每个安装点加载的力大小为250N，2个前排座椅总共2000N。而后排长座椅，在每根后排座椅横梁上加载1000N的垂向力，则对于每根横梁上有4个安装点的后座椅，每个安装点加载的力大小为250N，总共2000N。承载式车身所有加载的力大小总计4000N，方向均为Z向。而对于非承载式车身结构，就只在前排座椅上加载，总计2000N。Averticalloadof250Nappliedateachseatattachmentwithtotalloadof1000Nforeachcaptainseatandappliedatfirst2seats.Forthebenchseat,alineloadoftotal1000Ncanbeappliedalongseatcrossmember.Agrandtotalof4000NstaticloadsareappliedatseatsinZforaunibodystructure.Foratruckcabstructure,theloadisappliedonlytothefirstrowseatwiththetotalof2000N.图2弯曲示意图Fig2BendingDisplay前端垂向弯曲刚度FrontEndVerticalBendingStiffness约束ConstraintsA柱与门槛连接处的上下焊接边，长度为100mm，约束XYZ。Itisappliedatbothupperanddownflangesaftercurvesofrockerjointsinthelengthof100mm.加载Loads在前纵梁与碰撞盒连接处，左右分别加载5000N，方向为-Z。Aloadof5000NisappliedinZatthecenterofendsectionofthefrontrail.图3前端垂向弯曲示意图Fig3TFrontEndVerticalBendingDisplay前端侧向弯曲刚度FrontEndLateralBendingStiffness约束ConstraintsA柱与门槛连接处的上下焊接边，长度为100mm，约束XYZ。Itisappliedatbothupperanddownflangesaftercurvesofrockerjointsinthelengthof100mm.Constraintsofdegree-of-freedom(DOF)X,Y,Z.加载Loads如果前副车架与白车身是螺栓连接，左右5000N的Y向力加载在下控制臂与转向节连接孔中心。如果前副车架与白车身是衬套连接，左右5000N的Y向力加载在前副车架在白车身的前安装点。Forboltedonfrontsub-frame,aloadof5000NisappliedinYdirectionatthecenterofLCA(lowercontrolarm)attachmenttospindleatbothside.Forsoft-mountedfrontsub-frame,aloadof5000NisappliedinYdirectionatthecenteroffrontattachmentoffrontsub-frame.图4前端侧向弯示意图Fig4FrontEndLateralBendingDisplay后端垂向弯曲刚度RearEndVerticalBendingStiffness约束Constraints约束前后悬减振弹簧支座位置，其中前左处约束YZ自由度，前右处约束Z自由度，后左处约束XYZ自由度，后右处约束XZ自由度。Itisappliedatbothfrontandrearshocktower.Theconstraineddegreeoffreedom:YZ(Frontleft),Z(Frontright),XYZ(Rearleft),XZ(Rearright).加载Loads位于后地板上，后纵梁末端中间位置处，加载方向为-Z，大小为左右两边分别750N，区域为Y125mmX25mm。Aloadof750NisappliedinZontopoffloorandalignedwithunderbodyrailinthelength125mmand25mmawayfromrearrailsillinXdirectionateachside图5后端垂向弯曲示意图Fig5RearEndVerticalBendingDisplay后端侧向弯曲刚度RearEndLateralBendingStiffness约束ConstraintsA柱与门槛连接处的上下焊接边，长度为100mm，约束XYZ。Itisappliedatbothupperanddownflangesaftercurvesofrockerjointsinthelengthof100mm.Constraintsofdegree-of-freedom(DOF)X,Y,Z.加载Loads在位于后纵梁与碰撞盒连接处，加载方向为Y，大小为两边分别是5000N。Aloadof5000NisappliedinYatthecenterofendsectionoftherearrailateachside.图6后端侧向弯曲示意图Fig7RearEndLateralBendingDisplay结果Results白车身弯曲刚度Bodyglobalbendingstiffness测量左右门槛下端的最大变形或中央通道的最大变形。Maximumdeflectionismeasuredattunnelcenterlineandunderneathrockerout-board(oneelementoffflange)onflatarea,respectively.计算公式Computation：对于承载式车身Foraunibodystructure:对于非承载式车身Foratruckcab前端垂向弯曲刚度FrontEndVerticalBendingStiffness测量加载点即测量点变形量。Thedeflectionismeasuredatthesamelocationwheretheloadisapplied.计算公式Computation：前端侧向弯曲刚度FrontEndLateralBendingStiffness测量加载点即测量点变形量。Thedeflectionismeasuredatthesamelocationwheretheloadisapplied.计算公式Computation：后端垂向弯曲刚度RearEndVerticalBendingStiffness测量后纵梁最末端或后纵梁中间变形量。Thedeflectionismeasuredunderneathsurfaceoftherearsillattwolocations:oneisalignedwiththecenterofrailandtheotherisatthecenter(inY)ofrearsilldownflange.计算公式Computation：后端侧向弯曲刚度RearEndLateralBendingStiffness测量加载点即测量点变形量。Thedeflectionismeasuredatthesamelocationwheretheloadisapplied.计算公式Computation：性能要求PerformanceRequirements无。分析要求ANALYSISREQUIREMENTS无。参考文件DOCUMENTATION无。联系人CONTACTS无。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$$$$FORCEData$$FORCE29338117301.00.00.0-250.0FORCE29338117401.00.00.0-250.0FORCE29338117501.00.00.0-250.0FORCE29338117601.00.00.0-250.0FORCE29338117701.0