UG有限元高級仿真-真正有用的資料

高級仿真高級仿真 1NXNastranstructuralanalysisandsolutiontypes 2NXNastranthermalanalysisandsolutiontypes 4線性靜態(tài)分析 4Supportedlinearstaticanalysistypes 4Usingmaterialsforalinearstaticanalysis 5Definingboundaryconditionsforalinearstaticanalysis 5Usingtheiterativesolver 5模態(tài)分析 6Supportedmodalanalysistypes 6Usingmaterialsforamodalanalysis 7Definingboundaryconditionsforamodalanalysis 7Settingmodalsolutionattributes 7Reviewingmodalanalysisresults 8如何判斷模態(tài)的頻率 9線性曲屈分析 9Bucklinganalysisintroduction 9Linearbucklingassumptions 10Supportedbucklinganalysistypes 10Usingmaterialsforabucklinganalysis 10Definingboundaryconditionsforabucklinganalysis 10Reviewingbucklinganalysisresults 11Nonlinearstaticanalysisintroduction 11Supportednonlinearsolutiontypes 12Whethertouseanonlinearsolution 12UsingelementsforsolutiontypeNLSTATIC106 13UsingelementsforsolutiontypeADVNL601,106 13UsingmaterialsforsolutiontypesNLSTATIC106andADVNL601,106 14Enteringstress/straindataforsolutiontypesNLSTATIC106andADVNL601,106 14DefiningboundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,106 15NLSTATIC106的求解設(shè)置 15ADVNL601,106的求解設(shè)置 16響應(yīng)仿真 17仿真步驟 17Specialboundaryconditions 18SolutionattributesforResponseSimulation 20FRFandTransmissibility 20Analysisevents 21Excitationloads 22FunctiontoolsforResponseSimulationutility 22Sensors 23Straingages 23產(chǎn)生整個模型在極值點處的響應(yīng) 24柔體分析 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.線性靜態(tài)分析SupportedlinearstaticanalysistypesInAdvancedSimulation,youcanchoosefromthefollowinglinearstaticanalysistypeswhenyoucreateastructuralsolution.SolverSolutiontypeNXNastranMSCNastranSESTATIC101-SingleConstraintNXNastranMSCNastranSESTATIC101-Multi-ConstraintANSYSLinearStaticsABAQUSStaticPerturbationsubstepUsingmaterialsforalinearstaticanalysisMaterialtypesthatcanbeusedinalinearstaticanalysisinclude:IsotropicOrthotropicAnisotropicLaminateDefiningboundaryconditionsforalinearstaticanalysisBoundaryconditionsforlinearstaticanalysiscanbegeometry-basedorfiniteelement-based.Examplesinclude:PointandedgeforcesFaceloadsTemperatureloadsDisplacementconstraintsCoupleddegreesoffreedomUsingtheiterativesolverYoucanturnontheElementIterativeSolveroptionontheSolutiondialogbox,orwhenyouarepromptedafteryoustartasolve.Theiterativesolver:Canbefaster,useslessmemory,andhasfewerdiskrequirementsthanthestandardsparsematrixsolver.Canbeusedforalinearstaticanalysisthatdoesnotincludecontact.Showsthebestperformancegainwithmodelscomposedmostlyofsolidelements.Isveryefficientformodelscomposedmostlyofparabolictetrahedralelements.模態(tài)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.如何判斷模態(tài)的頻率Thefirst6modeshaveextremelylowfrequencies.Thesearerigidbodymodes.Mode7representsthefirstflexiblemodewithanaturalfrequencyofabout133Hz.線性曲屈分析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，那么這個模型就已經(jīng)發(fā)生曲屈。ThecriticalloadistheproductoftheappliedloadandtheeigenvalueforMode1.比如在本例中施加的載荷為1N,而Mode1的對應(yīng)值為1380，那么這個臨界載荷為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.幾何非線性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的求解設(shè)置LargeDisplacements—Includesnonlineargeometryeffects.IntermediateOutput—Determinesifoutputisstoredforeveryconvergedloadincrement,oronlyatthefinalincrementforeachsubcase.NumberofIncrements—Subdividesallsubcaseloadsbythevalueentered.Thiscanbeincreasedifasolutionhasproblemsconverging.ADVNL601,106的求解設(shè)置solutioncontrolandstrategyinADVNL601,106aresetundertheCaseControltab/StrategyParameters.Someexamplesare:AnalysisControl—SettingtheAutomaticIncrementationSchemetoATSautomaticallysubdividestimestepsthatfailtoconverge.Equilibrium—Canbeusedtoadjustthedefaultconvergenceoptionsandtolerances.Also,thelinesearchiterationschemecanbeselectedhere.Contact—Controlscontactoptionsforallcontactsets.響應(yīng)仿真主要就是用于確定結(jié)構(gòu)模型對于一系列載荷工況的動態(tài)或靜態(tài)響應(yīng)仿真步驟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.在響應(yīng)仿真中，除了你可以定義同其它的求解器一樣的約束與邊界條外，還有如下的特殊的邊界條件。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在完成載荷與邊界條及一些其它的邊界條件之后就可以進(jìn)行求解了。頻率響應(yīng)函數(shù)(FRF)用來評估一個或幾個節(jié)點或單元的對于輸入的單位載荷的響應(yīng)傳遞性（transmissibilit）可以用來評估一個或幾個節(jié)點對于強(qiáng)迫位移或速度或加速度的響應(yīng)。Evaluatetransmissibility（這是后處理中的重要一步）Transmissibilityisafrequencyresponsefunction(FRF)thatletsyouevaluatetheresponseofoneorseveraloutputnodestoanenforcedmotioninputsuchasdisplacement,velocity,oraccelerationataselectednode.Analysisevents分析類型及可獲得的結(jié)果：EventtypeResponsecalculated瞬態(tài)響應(yīng)結(jié)構(gòu)在隨時間變的的激勵載荷下的動態(tài)響應(yīng)主要適用于比如驅(qū)車在一個車道上行駛或其它的任何的結(jié)構(gòu)在一段時間內(nèi)受激勵載荷的影響頻率響應(yīng)結(jié)構(gòu)受一組振蕩載荷的作用由于發(fā)動機(jī)的振動或車輪的不平衡對于駕駛者的舒適程度的影響隨機(jī)響應(yīng)Thepowerspectraldensity(PSD),rootmeansquare(RMS),andlevel-crossingrate(LCR)resultsofastructuretooneormoresimultaneousrandomexcitations.Examplesofrandomexcitationsincludejetenginenoise,aprofileofaroadsurface,andtheeffectsofturbulenceonanairplane.普分析(alsocalledshockresponsespectrum)Thepeakresponseofastructuretoasetofsimultaneousbaseexcitationsdefinedbyresponsespectrumfunctions.分析實例主要有：航空著陸,核超壓分析,墜落實驗,地震分析DDAM(DynamicDesignAnalysisMethod)Thedynamicresponseofaship'scomponentstoshocksappliedtotheship'shull,deck,orshellplatingmountings.YoucandefineyourproprietaryshockcoefficientsasinputtotheDDAMevent.Youpredefinethesecoefficientsinatextfile.Thenyoucanenteramultipliertoadjustthemeachtimeyouperformtheresponseevaluation.Quasi-StaticThestaticresponseofastructuretoasetofsimultaneoustime-varyingstaticexcitations.Thiseventtypeisusefulifyouareonlyinterestedinstaticresultsandneedfastersolutionperformancethanafulldynamicsolution.Excitationloads激勵載荷主要有以下幾種：首先激勵載荷是一種外部載荷。比如說交通工具的輪胎撞到路面上的凸起。powerspectraldensity(PSD)rootmeansquare(RMS)level-crossingrate(LCR)可能是以下幾種中的一種:Nodalforcedefinedbyanode,adirection,andaforcefunction.Nodalenforced（強(qiáng)迫的）motiondefinedbyanode,adirection,andafunctionofdisplacement,velocity,oracceleration.Distributed-loadexcitationdefinedbyscalingaloadthatyoupredefinedinthesolution(Transient,Frequency,orRandomeventsonly).Constantvelocityimpactordropimpactappliedtoasinglenode(usinganautomaticallygeneratedhaversinefunction).Rotatingforcedefinedaseitherageneralrotatingforceoranunbalancedrotatingmassaboutagivenaxis(Frequencyeventsonly).FunctiontoolsforResponseSimulationutilityThisutilityprovidesusefulfunctioncommandssuchas:Easycreationofexcitationfunctions,suchaspulse（脈沖）,randomsignal,andramp（斜坡函數(shù)）functionsDisplacement,velocity,andaccelerationdataconversion（數(shù)據(jù)轉(zhuǎn)換）Time,frequency,SRS,andPSDdataconversionInterpolationEnvelopelineEquationcombinationNXNastranPunchfileconversionfornodalresultsSensors傳感器就是你在模型中定義的某個節(jié)點，你想在此節(jié)點處觀察響應(yīng)結(jié)果.比如傳感器可以代表加速計的位置。Sensorsallowyoutoevaluatedisplacement,velocity,acceleration,andreactionforce.Eachnodeyouselectinyoursensordefinitiongeneratesaresponsefunction.Sensorsarestoredwithnamesthatreflectthenodeanddirectioninwhichthesensorevaluates.Forexample,Sensor_1_2_(99X+)_1representsthefunction2resultforSensor_1atnode99inthepositiveXdirection.StraingagesUseastraingagetospecifyanodalorelementallocationonthemodelatwhichtoevaluatestressorstrainresultsinaspecifieddirection.Straingagesdefine:LocationCoordinatesystemforthestressorstrainresultsComponentsofthestressorstrainresults在響應(yīng)仿真的求解過程中也包含了模態(tài)響應(yīng)的過程，而且如果模態(tài)數(shù)設(shè)置的越多，那么求解結(jié)果會越準(zhǔn)確。這個模態(tài)的仿真分析可以從后處理器中查看到。在求解器中要進(jìn)行如下的特殊設(shè)置其它后處理1.當(dāng)然在此過程之前應(yīng)先定義一個響應(yīng)函數(shù)產(chǎn)生整個模型在極值點處的響應(yīng)RunaResponseResultsevaluation.IntheEvaluateResponseResultsdialogbox,selectStressastheRequestedResult(cleartheDisplacementcheckbox).Selectalltheelementsinthemodel.SelectFromXYGraphastheMethod.UnderPointValue,clickthebutton.IntheEquationSelectionlist,select2_(16E_VONMTOP).Intheplottedelementalstressfunction,selectthetimepointwherestressishighest,andthenclickOKtogeneratetheresponseresults.柔體分析定義：在運動仿真的過程中只是根據(jù)一定的約束條件，剛性體作一定的運動，它不含有任何的動態(tài)分析的特性，尤其是在以下情況下：顯著的影響或運動的突然改變或是剛性桿件具有中夠的柔性而防礙運動的情況。FlexiblebodiesworkflowAdvancedSimulationstepsCreateafiniteelementmodelandNXNastranSEMODES103–FlexibleBodysolution.Meshtheflexiblecomponentanddefinematerialproperties.Usea1DConnection(spidereleme