UG有限元高级仿真-真正有用的资料

高级仿真高级仿真 1NXNastranstructuralanalysisandsolutiontypes 2NXNastranthermalanalysisandsolutiontypes 4线性静态分析 4Supportedlinearstaticanalysistypes 4Usingmaterialsforalinearstaticanalysis 5Definingboundaryconditionsforalinearstaticanalysis 5Usingtheiterativesolver 5模态分析 6Supportedmodalanalysistypes 6Usingmaterialsforamodalanalysis 7Definingboundaryconditionsforamodalanalysis 7Settingmodalsolutionattributes 7Reviewingmodalanalysisresults 8如何判断模态的频率 9线性曲屈分析 9Bucklinganalysisintroduction 9Linearbucklingassumptions 10Supportedbucklinganalysistypes 10Usingmaterialsforabucklinganalysis 10Definingboundaryconditionsforabucklinganalysis 10Reviewingbucklinganalysisresults 11Nonlinearstaticanalysisintroduction 11Supportednonlinearsolutiontypes 12Whethertouseanonlinearsolution 12UsingelementsforsolutiontypeNLSTATIC106 13UsingelementsforsolutiontypeADVNL601,106 13UsingmaterialsforsolutiontypesNLSTATIC106andADVNL601,106 14Enteringstress/straindataforsolutiontypesNLSTATIC106andADVNL601,106 14DefiningboundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,106 15NLSTATIC106的求解设置 15ADVNL601,106的求解设置 16响应仿真 17仿真步骤 17Specialboundaryconditions 18SolutionattributesforResponseSimulation 20FRFandTransmissibility 20Analysisevents 21Excitationloads 22FunctiontoolsforResponseSimulationutility 22Sensors 23Straingages 23产生整个模型在极值点处的响应 24柔体分析 24Flexiblebodiesworkflow 24AdvancedSimulationsteps 24MotionSimulationsteps 25ConnectingtheflexiblebodyFEMtothemechanism 25Definingconnectionandloaddegreesoffreedom 25NXNastranstructuralanalysisandsolutiontypesAnalysistypeSolutiontypeDescriptionLinearStaticSESTATIC101–SingleConstraintSESTATIC101–Multi-ConstraintSESTATIC101–SuperelementStructuralsolveusedtosolvelinearandsomenonlinearproblems,suchasgapsandcontactelements.ModalAnalysisSEMODES103SEMODES103–ResponseSimulationSEMODES103–SuperelementSEMODES103–FlexibleBodyEvaluatesnormalmodesandnaturalfrequencies.LinearBucklingSEBUCKL105Determinesbucklingloadsandbuckledmodeshapes.NonlinearStaticsNLSTATIC106Considersgeometricandmaterialnonlinearbehavior.Frequencyresponseiscalculateddirectly(withoutnormalmodes).Transientresponseiscalculateddirectly(withoutnormalmodes).Frequencyresponseisbasedonpreviouslysolvednormalmodes.Transientresponseisbasedonpreviouslysolvednormalmodes.Dynamictransientresponseiscalculated,whichincludes(NLSTATIC106)nonlinearconditions.Considersgeometricandmaterialnonlinearbehavior.Dynamictransientresponseiscalculated,whichincludesnonlinearconditions.Calculatesdynamicresponseswithnonlineareffects.Adjuststhedefineddesignvariableswithinthelimitsyouspecifyasitsearchesfortheoptimumconditions,whileworkinginthescopeofyouroveralloptimizationobjectiveandoutputconstraints.SolvesanFEmodelthatisdefinedforonlyasectioncutononesideoftheaxisofanaxisymmetricpart.Thisgreatlyreducesthedegreesoffreedom(DOF)andhencealsosignificantlyreducessolutiontime.NXNastranthermalanalysisandsolutiontypesAnalysistypeSolutiontypeDescriptionSteadyStateHeatTransferNLSCSH153Thermalanalysis.AxisymmetricThermalNLSCSH153ThermalanalysisforanFEmodelthatisdefinedforonlyasectioncutononesideoftheaxisofanaxisymmetricpart.线性静态分析SupportedlinearstaticanalysistypesInAdvancedSimulation,youcanchoosefromthefollowinglinearstaticanalysistypeswhenyoucreateastructuralsolution.SolverSolutiontypeNXNastranMSCNastranSESTATIC101-SingleConstraintNXNastranMSCNastranSESTATIC101-Multi-ConstraintANSYSLinearStaticsABAQUSStaticPerturbationsubstepUsingmaterialsforalinearstaticanalysisMaterialtypesthatcanbeusedinalinearstaticanalysisinclude:IsotropicOrthotropicAnisotropicLaminateDefiningboundaryconditionsforalinearstaticanalysisBoundaryconditionsforlinearstaticanalysiscanbegeometry-basedorfiniteelement-based.Examplesinclude:PointandedgeforcesFaceloadsTemperatureloadsDisplacementconstraintsCoupleddegreesoffreedomUsingtheiterativesolverYoucanturnontheElementIterativeSolveroptionontheSolutiondialogbox,orwhenyouarepromptedafteryoustartasolve.Theiterativesolver:Canbefaster,useslessmemory,andhasfewerdiskrequirementsthanthestandardsparsematrixsolver.Canbeusedforalinearstaticanalysisthatdoesnotincludecontact.Showsthebestperformancegainwithmodelscomposedmostlyofsolidelements.Isveryefficientformodelscomposedmostlyofparabolictetrahedralelements.模态分析SupportedmodalanalysistypesInAdvancedSimulation,youcanchoosefromthefollowingmodalanalysistypeswhenyoucreateastructuralsolution:SolverSolutiontypeNXNastranSEMODES103SEMODES103-ResponseSimulationSEMODES103-SuperelementSEMODES103-FlexibleBodyMSCNastranSEMODES103SEMODES103-SuperelementANSYSModalABAQUSFrequencyPerturbationsubstepUsingmaterialsforamodalanalysisMaterialtypesthatcanbeusedinamodalanalysisinclude:IsotropicOrthotropicAnisotropicFluidDefiningboundaryconditionsforamodalanalysisBoundaryconditionsformodalanalysisincludeconstraintsandgluing,suchas:Displacementconstraints.Coupleddegreesoffreedom.Surface-to-surfacegluingSettingmodalsolutionattributesForamodalanalysis,someoftheNXNastransolutionattributesinclude:MaxJobTimeOutputRequestsRealEigenvalueExtractionData.Identifiesthetypeofsolve:LanczosorHouseholder.LanczosMethodorHouseholderMethod.Themethodspecifiestherealeigenvalueextractionoptionsforthesolution.Eigenvalueextractionoptionsarestoredasasolver-specificobject.Lanczosistherecommendedmethodformostmodels;Householderisrecommendedforsmallermodels.Theoptionsincludefrequencyrangelowerandupperlimits,andthenumberofdesiredmodes.DefaultTemperatureFormoreinformation,seeSolversandSolutions→SettingNastranSolutionOptionsintheAdvancedSimulationonlineHelp.ReviewingmodalanalysisresultsNaturalfrequenciesandmodeshapesaretheprimaryresultsforamodalsolution.Theresultsareorderedbyfrequency,withthelowestnaturalfrequencybeingthefirstmodeshape,thenexthighestbeingthesecondmode,andsoon.Thenormalmodesrepresentdynamicstatesinwhichtheelasticandinertialforcesarebalancedwhennoexternalloadsareapplied.Themagnitudeofthemodeshapesisarbitrary.Theamplitudeofthedisplacementisnotsignificant,buttherelativedisplacementofthenodesissignificant.Modeshapeshelpyoudeterminewhatloadlocationsanddirectionswillexcitethestructure.如何判断模态的频率Thefirst6modeshaveextremelylowfrequencies.Thesearerigidbodymodes.Mode7representsthefirstflexiblemodewithanaturalfrequencyofabout133Hz.线性曲屈分析BucklinganalysisintroductionBucklinganalysis:Determinesbucklingloadsandbuckledmodeshapes.Abucklingloadisthecriticalloadatwhichastructurebecomesunstable.Abuckledmodeshapeisthecharacteristicshapeassociatedwithastructure'sbuckledresponse.Identifiesthecriticalloadfactor,whichisthevaluethatcanbemultipliedbytheappliedloadtocausebuckling.LinearbucklingassumptionsThebucklinganalysisuseslineartheory.Thefollowingassumptionsandlimitationsapply:Thedeflectionspriortobucklingaresmall.Thereferenceequilibriumconfigurationistheinitialgeometryofthepart.Theresponseofthestructurepriortobucklingexhibitsalinearrelationshipbetweenstressandstrain.Post-bucklingbehaviorisnotpredictedSupportedbucklinganalysistypesInAdvancedSimulation,youcanchoosefromthefollowingbucklinganalysistypeswhenyoucreateabucklingsolution:SolverSolutiontypeNXNastranMSCNastranSEBUCKL105ANSYSBucklingABAQUSBucklingPerturbationSubstepUsingmaterialsforabucklinganalysisMaterialtypesthatcanbeusedinabucklinganalysisinclude:IsotropicOrthotropicAnisotropicDefiningboundaryconditionsforabucklinganalysisForabucklinganalysis:Defineconstraints.Constrainthemodelasyouwouldforalinearstaticanalysis.Applyloads.Theloadsetcancontainmorethanoneloadtype(Force,Pressure),buteveryloadwillbescaledbytheloadfactor.Amagnitudeof1isoftenusedwhenasingleloadtypewillcausethemodeltobuckle.ReviewingbucklinganalysisresultsForNXNastranresults,bucklinganalysisresultsarelistedas:Asetofstaticanalysisresultsforthebucklingloadssubcase.Asetofmodesforthebucklingmethodssubcase.Eachmodehasaneigenvalue(loadfactor)listed.Theappliedloadmultipliedbythebucklingloadfactoristheloadatwhichthepartwillbuckle.Thefirstmodehasthelowestbucklingloadfactorandisusuallythemodeofmostinterest.Ifthebucklingloadfactorisbelow1,theparthasbuckled.如果eigenvalue小于1，那么这个模型就已经发生曲屈。ThecriticalloadistheproductoftheappliedloadandtheeigenvalueforMode1.比如在本例中施加的载荷为1N,而Mode1的对应值为1380，那么这个临界载荷为1x1380N.NonlinearstaticanalysisintroductionThenonlinearsolutiontypesNLSTATIC106andADVNL601,106arecapableofsimulatingthefollowingconditions:geometricnonlinear,materialplasticity,andhyperelasticity.Thisintroductionpresentstwoofthesenonlinearconditions:Materialplasticity–Materialdataisenteredthatdescribesboththelinearelasticandtheplasticyieldportionofthestressstraincurve.Geometricnonlinear–Pressureloadsandelementstiffnessareupdatedasthesolutioniterates.Largegeometrydisplacementsandrotationaresupported.NLSTATIC106andADVNL601,106solutionscanincludematerialplasticityandgeometricconditionsseparatelyorsimultaneously.SupportednonlinearsolutiontypesInAdvancedSimulation,youcanchoosefromthefollowingnonlinearsolutiontypeswhentheAnalysisTypeissettoStructural.SolverSolutiontypeNXNastranNLSTATIC106ADVNL601,106ADVNL601,129ADVNL701MSCNastranNLSTATIC106ANSYSNonlinearStaticsABAQUSGeneralAnalysisWhethertouseanonlinearsolutionAnSESTATIC101linearstaticsolution:Calculatestheelementstiffness(K)matrixonceatthebeginningofthesolution.AssumesHooke'slaw,Force=KU,tocalculatedisplacements(U).Doesnotaccountforlargedisplacementsandrotation.Willnotupdatepressureloaddirections.AnNLSTATIC106orADVNL601,106solutionwithgeometricnonlinearconditions:Iterates(迭代)tofollowanonlinearforce/displacementpath.Periodically（定期的）updatestheelementstiffnessmatrixwhilefollowingthenonlinearforce/displacementpath.Usesastraindefinitionwhichaccountsforlargedisplacementsandrotations.Usesthecurrentconfigurationofadeformedstructuretodeterminethedirectionofpressureloads.Astiffnesschangemaybearesultofbothgeometryandmaterialnonlineareffectsifbothareincludedintheanalysis.几何非线性UsingelementsforsolutiontypeNLSTATIC106ForsolutiontypeNLSTATIC106,nonlinearelementsmaybecombinedwithlinearelementsforcomputationalefficiencyifthenonlineareffectscanbelocalized.Thesupportednonlinearelementsinclude:3D4-nodedand10-nodedtetrahedralsolidelements.3D8-nodedhexahedralsolidelements.3D6-nodedpentagonalsolidelements.2D4-nodedquadrilateralor3-nodedtriangularthinshellelements.1D2-nodedbar,beam,rod,andspringelements.GAPelementsarecreatedwhen“contactmesh”or“surfacecontactmesh”meshmatingconditionsaredefined.NLSTATIC106solutiontreatstheGAPelementasanonlineargapelementinwhichthegapconditionsupdateasthenonlinearsolutioniterates.UsingelementsforsolutiontypeADVNL601,106ForsolutiontypeADVNL601,106,thesupportednonlinearelementsinclude:3D4-nodedand10-nodedtetrahedralsolidelements.3D8-nodedand20-nodedhexahedralsolidelements.3D6-nodedand15-nodedpentagonalsolidelements.3D5-nodedand13-nodedpyramidsolidelements.3D4-nodedand8-nodedor3-nodedand6-nodedaxisymmetricthinshellelements.2D4-nodedand8-nodedquadrilateralor3-nodedand6-nodedtriangularthinshellelements.1D2-nodedbar,beam,rod,andspringelements.RBE2andRBE3elements.0Dconcentratedmasselements.Gapelements.UsingmaterialsforsolutiontypesNLSTATIC106andADVNL601,106MaterialtypesthatcanbeusedinthesolutiontypeNLSTATIC106include:Isotropicwithorwithoutelastic/plasticproperties.Anisotropicforgeometricnonlinearonly.HyperelasticpropertiesthatcanbeassigneddirectlytothephysicalpropertiesforPLPLANE(2Delements)orPLSOLID(3Delements).MaterialtypesthatcanbeusedinthesolutiontypeADVNL601,106include:Isotropic.Orthotropic.HyperelasticpropertiesthatcanbeassigneddirectlytothephysicalpropertiesforPLPLANE(2Delements)orPLSOLID(3Delements).Enteringstress/straindataforsolutiontypesNLSTATIC106andADVNL601,106Createanewisotropicmaterial.IntheStress-StrainRelatedPropertiesgroup,selectFieldfromtheStress-Strain(H)list.FromtheSpecifyFieldlist,selectTableConstructor.Enteravalueof0,0forthefirstdatapoint.Forthesecondpoint,enteravaluethatcorrespondstotheyieldpoint.Youcanalsodefineadditionaldatapoints.IntheIsotropicMaterialdialogbox,enteranInitialYieldPoint(LIMIT1)value.Thisvaluemustmatchthesecondstressvalueinthestress-straintable.DefiningboundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,106BoundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,106canbegeometry-basedorfiniteelement-based.Examplesinclude:Displacementconstraints.Allloads.Onlypressureloadsareupdatedingeometricnonlinear.Surface-to-surfacegluing.Surface-to-surfacecontactissupportedforADVNL601,106,butnotforNLSTATIC106.NLSTATIC106的求解设置LargeDisplacements—Includesnonlineargeometryeffects.IntermediateOutput—Determinesifoutputisstoredforeveryconvergedloadincrement,oronlyatthefinalincrementforeachsubcase.NumberofIncrements—Subdividesallsubcaseloadsbythevalueentered.Thiscanbeincreasedifasolutionhasproblemsconverging.ADVNL601,106的求解设置solutioncontrolandstrategyinADVNL601,106aresetundertheCaseControltab/StrategyParameters.Someexamplesare:AnalysisControl—SettingtheAutomaticIncrementationSchemetoATSautomaticallysubdividestimestepsthatfailtoconverge.Equilibrium—Canbeusedtoadjustthedefaultconvergenceoptionsandtolerances.Also,thelinesearchiterationschemecanbeselectedhere.Contact—Controlscontactoptionsforallcontactsets.响应仿真主要就是用于确定结构模型对于一系列载荷工况的动态或静态响应仿真步骤StepSummary1.Buildthefiniteelement(FE)model.Definethegeometry,materialproperties,mesh,andconstraints,asyouwouldforotherstructuralsolutiontypes.Also,specifythelocationsofyourexcitationsanddefineanystaticanddynamicloads.2.CreatetheNXNastransolution.CreateanNXNastranSEMODES103–ResponseSimulationsolution.YoucanalsouseanSEMODES103solution,butitgeneratesonlythenormalmodes.3.Solvethemodel.NXNastrangeneratesnormalmodes,constraintmodes,attachmentmodes,andothermodalinformation.4.CreatetheResponseSimulation.Aftersolvingthemodel,createtheResponseSimulationsolutionprocess.5.Reviewthemodeshapes.ReviewthemodeshapesinthePost-ProcessingNavigatororintheResponseSimulationDetailsViewsubpanelintheSimulationNavigator.6.Definethedampingvaluesforeachmode.IntheResponseSimulationDetailsViewsubpanel,youcanaddviscousandhystereticdamping.7.Createanevent.Definethetypeofresponsesimulationyouwillperform,suchastransientorfrequency.Theeventcombinesthemodalmodelandyourexcitationfunctions.8.Createexcitationfunctions.Excitationsdefinetheloadingfortheresponsesimulation,suchasavehicle'stiresfollowingabump'sprofile.9.Analyzethemodel'sdynamicresponsestotheexcitations.Dependingonthetypeofresponseyouareevaluating,thesoftwarecalculatesandstorestheresultsinresponsefunctionsorresponseresultssets.Responsefunctionseachcontainoneresponse(forexample,stressatonenode)asafunctionoftimeorfrequency.YoucanplotthesefunctionrecordsintheNXgraphicswindow.Responseresultssetseachcontainresponsesformultiplenodesorelementsinthemodelforonetimesteporfrequency.YoucanviewresponseresultssetsascontourplotsonthePost-ProcessingNavigator.SpecialboundaryconditionsInResponseSimulation,afiniteelement(FE)modelrepresentsthephysicalmodelofthestructure.在响应仿真中，除了你可以定义同其它的求解器一样的约束与边界条外，还有如下的特殊的边界条件。TypeDescriptionEnforcedmotionlocationThelocationofanenforcedmotionexcitationonthemodel.Thisisalocationonly;youdefinetheactualexcitationloadafteryousolvethesolution.Thesolvergeneratesconstraintmodes,equivalentattachmentmodes,andeffectivemassesbasedontheselocations.CreateenforcedmotionlocationsintheConstraintscontainerintheSimulationNavigator.NodalForcelocationThelocationofanodalforceexcitationonthemodel.Thisisalocationonly;youdefinetheactualexcitationafteryousolvethesolution.Thesolvergeneratesattachmentmodesbasedontheselocations.CreatenodalforcelocationsintheLoadscontainerintheSimulationNavigator.StaticoffsetloadForTransientevents,aconstantloadforscalingtheresults(forexample,agravityloadforusewithconcentratedmasselements,oradistributedwindloadonthestructure).CreatestaticoffsetloadsintheSubcase–StaticOffsetcontainerintheSimulationNavigator.Afteryousolvethesolutionandcreateanevent,theStaticOffsetnodeappearsintheSimulationNavigatorundertheeventnode.Youcanexcludethestaticoffsetresultsfromtheresponseevaluationbyright-clickingtheStaticOffsetnodeandchoosingDeactivate.StressstiffeningloadAdifferentialstiffnesstoaccountfortheweakeningofastructureduetostress.Youcanusethisloadtopre-stressstructuresthatarethininoneortwodimensions,suchasshellorcable-likestructureswithsmallinitialstiffness,andlargemembraneloads,suchasadrumheadwithinitialtension.Thesolverusestheseloadstoaugmentthestiffnessinthenormalmodecalculations.Itcalculatesthestressstiffnessandcombinesitwiththelinearstiffnessandthenusesthecombinationofthesetwomatricestosolvethenormalmodeseigenvalueproblem.CreatestressstiffeningloadsintheSubcase–StressStiffeningcontainerintheSimulationNavigator.DynamicloadAloadyoucanscaleaftersolvingthemodalsolution.Thesolvergeneratesaloadsetanddistributedattachmentmodesforeachdynamicload.Youcanthenassignascalingfunctionwhenyoucreateanexcitation.Dynamicloadsarenecessaryforapplyingdistributed-loadexcitationsandcanalsobeusedasstaticexcitationsinaQuasi-Staticanalysisevent.CreatedynamicloadsintheSubcase–DynamicscontainerintheSimulationNavigator.SolutionattributesforResponseSimulationFRFandTransmissibility在完成载荷与边界条及一些其它的边界条件之后就可以进行求解了。频率响应函数(FRF)用来评估一个或几个节点或单元的对于输入的单位载荷的响应传递性（transmissibilit）可以用来评估一个或几个节点对于强迫位移或速度或加速度的响应。Evaluatetransmissibility（这是后处理中的重要一步）Transmissibilityisafrequencyresponsefunction(FRF)thatletsyouevaluatetheresponseofoneorseveraloutputnodestoanenforcedmotioninputsuchasdisplacement,velocity,oraccelerationataselectednode.Analysisevents分析类型及可获得的结果：EventtypeResponsecalculated瞬态响应结构在随时间变的的激励载荷下的动态响应主要适用于比如驱车在一个车道上行驶或其它的任何的结构在一段时间内受激励载荷的影响频率响应结构受一组振荡载荷的作用由于发动机的振动或车轮的不平衡对于驾驶者的舒适程度的影响随机响应Thepowerspectraldensity(PSD),rootmeansquare(RMS),andlevel-crossingrate(LCR)resultsofastructuretooneormoresimultaneousrandomexcitations.Examplesofrandomexcitationsincludejetenginenoise,aprofileofaroadsurface,andtheeffectsofturbulenceonanairplane.普分析(alsocalledshockresponsespectrum)Thepeakresponseofastructuretoasetofsimultaneousbaseexcitationsdefinedbyresponsespectrumfunctions.分析实例主要有：航空着陆,核超压分析,坠落实验,地震分析DDAM(DynamicDesignAnalysisMethod)Thedynamicresponseofaship'scomponentstoshocksappliedtotheship'shull,deck,orshellplatingmountings.YoucandefineyourproprietaryshockcoefficientsasinputtotheDDAMevent.Youpredefinethesecoefficientsinatextfile.Thenyoucanenteramultipliertoadjustthemeachtimeyouperformtheresponseevaluation.Quasi-StaticThestaticresponseofastructuretoasetofsimultaneoustime-varyingstaticexcitations.Thiseventtypeisusefulifyouareonlyinterestedinstaticresultsandneedfastersolutionperformancethanafulldynamicsolution.Excitationloads激励载荷主要有以下几种：首先激励载荷是一种外部载荷。比如说交通工具的轮胎撞到路面上的凸起。powerspectraldensity(PSD)rootmeansquare(RMS)level-crossingrate(LCR)可能是以下几种中的一种:Nodalforcedefinedbyanode,adirection,andaforcefunction.Nodalenforced（强迫的）motiondefinedbyanode,adirection,andafunctionofdisplacement,velocity,oracceleration.Distributed-loadexcitationdefinedbyscalingaloadthatyoupredefinedinthesolution(Transient,Frequency,orRandomeventsonly).Constantvelocityimpactordropimpactappliedtoasinglenode(usinganautomaticallygeneratedhaversinefunction).Rotatingforcedefinedaseitherageneralrotatingforceoranunbalancedrotatingmassaboutagivenaxis(Frequencyeventsonly).FunctiontoolsforResponseSimulationutilityThisutilityprovidesusefulfunctioncommandssuchas:Easycreationofexcitationfunctions,suchaspulse（脉冲）,randomsignal,andramp（斜坡函数）functionsDisplacement,velocity,andaccelerationdataconversion（数据转换）Time,frequency,SRS,andPSDdataconversionInterpolationEnvelopelineEquationcombinationNXNastranPunchfileconversionfornodalresultsSensors传感器就是你在模型中定义的某个节点，你想在此节点处观察响应结果.比如传感器可以代表加速计的位置。Sensorsallowyoutoevaluatedisplacement,velocity,acceleration,andreactionforce.Eachnodeyouselectinyoursensordefinitiongeneratesaresponsefunction.Sensorsarestoredwithnamesthatreflectthenodeanddirectioninwhichthesensorevaluates.Forexample,Sensor_1_2_(99X+)_1representsthefunction2resultforSensor_1atnode99inthepositiveXdirection.StraingagesUseastraingagetospecifyanodalorelementallocationonthemodelatwhichtoevaluatestressorstrainresultsinaspecifieddirection.Straingagesdefine:LocationCoordinatesystemforthestressorstrainresultsComponentsofthestressorstrainresults在响应仿真的求解过程中也包含了模态响应的过程，而且如果模态数设置的越多，那么求解结果会越准确。这个模态的仿真分析可以从后处理器中查看到。在求解器中要进行如下的特殊设置其它后处理1.当然在此过程之前应先定义一个响应函数产生整个模型在极值点处的响应RunaResponseResultsevaluation.IntheEvaluateResponseResultsdialogbox,selectStressastheRequestedResult(cleartheDisplacementcheckbox).Selectalltheelementsinthemodel.SelectFromXYGraphastheMethod.UnderPointValue,clickthebutton.IntheEquationSelectionlist,select2_(16E_VONMTOP).Intheplottedelementalstressfunction,selectthetimepointwherestressishighest,andthenclickOKtogeneratetheresponseresults.柔体分析定义：在运动仿真的过程中只是根据一定的约束条件，刚性体作一定的运动，它不含有任何的动态分析的特性，尤其是在以下情况下：显著的影响或运动的突然改变或是刚性杆件具有中够的柔性而防碍运动的情况。FlexiblebodiesworkflowAdvancedSimulationstepsCreateafiniteelementmodelandNXNastranSEMODES103–FlexibleBodysolution.Meshtheflexiblecomponentanddefinematerialproperties.Usea1DConnection(spidereleme