悬架控制臂刚度分析规范

Q/SZJ191001-2017悬架控制臂刚度分析SpecificationOfStiffnessAnalysisForSuspensionControlArm20XX20XX-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悬架控制臂刚度分析范围本标准规定了悬架控制臂刚度分析的分析方法及结果处理方法。本标准适用于CAE部门悬架控制臂刚度分析。规范性引用文件无。术语和定义无。摘要Abstract本规范描述了悬架控制臂刚度分析流程，仅针对于用于长短臂和麦弗逊的前后悬架三角类型的上下控制臂。这种控制臂用于通过球铰与外侧的悬架转向节相连，通过衬套与内侧的车架/副车架/车体相连。Thisprocedureoutlinesananalyticaltechniqueforevaluatingthestiffnessperformanceofsuspensioncontrolarms.Thisprocedureislimitedtotriangular-typeloweranduppercontrolarmsusedinconventionalShort-LongArm(SLA)andMacPhersonStrutfrontandrearsuspensions.Thesearmstypicallyconnectontheoutboardsidetoasuspensionknucklethroughaballjoint,andontheinboardsidetotheframe/sub-frame/bodystructurethroughrubberbushings.图1摆臂（控制臂）模型流程图收集控制臂收集控制臂设计信息ObtainDesignInformationforControlArm是否得到预定效果DoesmodelachievedesiredPerformance?建模BuildFEAModel线性分析PerformLinearStaticAnalysis后处理ReviewResults结束Stop否NO是Yes图2流程图Fig2ProcessFlowDiagram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模型包括控制臂和零长度弹簧单元Themodelshouldincludeafiniteelementrepresentationofthecontrolarm.Zero-lengthspringelementsarerequiredtorepresentthebushings坐标系CoordinateSystems整车坐标系。控制臂衬套也可以使用局部坐标系。Thefiniteelementmodelshouldbeconstructedintheglobalvehiclesystem.Controlarmbushingarefrequentlyorientedincoordinatesystemsotherthantheglobalcoordinatesystem.建模技巧ModelingTechniques网格质量应按照建模规范执行。对于钣金件，建议使用线性的四边形或三角形单元（NASTRANCQUAD4&CTRIA3）；对于铸件和机加件，建议使用二次四面体单元（NASTRANCTETRA10）。Withregardstomeshquality,thefiniteelementmodelshouldmeetguidelinesoutlinedinfiniteelementmodelingguidelines.Itissuggestedthatstampedsheetmetalpartsbemodeledusinglinearquad&trielements(NASTRANCQUAD4&CTRIA3).Itisalsosuggestedthatcastandmachinedpartsbemodeledusingparabolictetrahedralelements(NASTRANCTETRA10)假设和限制Assumptions/Limitations除刚体单元外，其它均使用线性材料的单元Allstructuralelements,exceptforrigidcomponents,aregivenlinearmaterialdefinitionsusingstandardmaterialproperties;载荷和边界条件Loads/BoundaryConditions约束Constraints通常有两种约束方式：衬套接地约束；惯性释放。注意当采用第二种方式时，必须同步所有连接处的载荷。如果是使用预测载荷，必须与衬套刚度同时更新（而第一种方式不需要这么做，因为衬套已经包含在模型中了）。Ingeneral,themodelcanbeconstrainedinoneoftwoways:Constraincontrolarmthroughbushingstoground.InertiareliefNotethattousemethod#2thatsimultaneousloadsmustbeavailableforallinterfacepointsofthecontrolarm.Ifusingpredictedloads,newloadsmustbecalculatedwheneverbushingrateschange.(Thisisnotrequiredforthefirstmethod,sincethebushingsthemselvesareincludedintheFEmodel).图3约束载荷Loads加载单位力Aunitloadisuse