UG有限元高級(jí)仿真真正有用的資料

-.z.高級(jí)仿真高級(jí)仿真1N*Nastranstructuralanalysisandsolutiontypes2N*Nastranthermalanalysisandsolutiontypes4線性靜態(tài)分析4Supportedlinearstaticanalysistypes4Usingmaterialsforalinearstaticanalysis5Definingboundaryconditionsforalinearstaticanalysis5Usingtheiterativesolver5模態(tài)分析6Supportedmodalanalysistypes6Usingmaterialsforamodalanalysis7Definingboundaryconditionsforamodalanalysis7Settingmodalsolutionattributes7Reviewingmodalanalysisresults8如何判斷模態(tài)的頻率9線性曲屈分析9Bucklinganalysisintroduction9Linearbucklingassumptions10Supportedbucklinganalysistypes10Usingmaterialsforabucklinganalysis10Definingboundaryconditionsforabucklinganalysis10Reviewingbucklinganalysisresults11Nonlinearstaticanalysisintroduction11Supportednonlinearsolutiontypes12Whethertouseanonlinearsolution12UsingelementsforsolutiontypeNLSTATIC10613UsingelementsforsolutiontypeADVNL601,10613UsingmaterialsforsolutiontypesNLSTATIC106andADVNL601,10614Enteringstress/straindataforsolutiontypesNLSTATIC106andADVNL601,10614DefiningboundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,10615NLSTATIC106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17Specialboundaryconditions18SolutionattributesforResponseSimulation20FRFandTransmissibility20Analysisevents21E*citationloads22FunctiontoolsforResponseSimulationutility22Sensors23Straingages23產(chǎn)生整個(gè)模型在極值點(diǎn)處的響應(yīng)24柔體分析24Fle*iblebodiesworkflow24AdvancedSimulationsteps24MotionSimulationsteps25Connectingthefle*iblebodyFEMtothemechanism25Definingconnectionandloaddegreesoffreedom25N*NastranstructuralanalysisandsolutiontypesAnalysistypeSolutiontypeDescriptionLinearStaticSESTATIC101–SingleConstraintSESTATIC101–Multi-ConstraintSESTATIC101–SuperelementStructuralsolveusedtosolvelinearandsomenonlinearproblems,suchasgapsandcontactelements.ModalAnalysisSEMODES103SEMODES103–ResponseSimulationSEMODES103–SuperelementSEMODES103–Fle*ibleBodyEvaluatesnormalmodesandnaturalfrequencies.LinearBucklingSEBUCKL105Determinesbucklingloadsandbuckledmodeshapes.NonlinearStaticsNLSTATIC106Considersgeometricandmaterialnonlinearbehavior.DirectFrequencyResponseSEDFREQ108Frequencyresponseiscalculateddirectly(withoutnormalmodes).DirectTransientResponseSEDTRAN109Transientresponseiscalculateddirectly(withoutnormalmodes).ModalFrequencyResponseSEMFREQ111Frequencyresponseisbasedonpreviouslysolvednormalmodes.ModalTransientResponseSEMTRAN112Transientresponseisbasedonpreviouslysolvednormalmodes.NonlinearTransientResponseNLTRAN129Dynamictransientresponseiscalculated,whichincludes(NLSTATIC106)nonlinearconditions.AdvancedNonlinearStatics(implicit)ADVNL601,106Considersgeometricandmaterialnonlinearbehavior.AdvancedNonlinearTransientResponse(implicit)ADVNL601,129Dynamictransientresponseiscalculated,whichincludesnonlinearconditions.AdvancedNonlinearDynamicAnalysis(e*plicit)ADVNL701Calculatesdynamicresponseswithnonlineareffects.DesignOptimizationDESOPT200Adjuststhedefineddesignvariableswithinthelimitsyouspecifyasitsearchesfortheoptimumconditions,whileworkinginthescopeofyouroveralloptimizationobjectiveandoutputconstraints.A*isymmetricStructuralSESTATIC101-Multi-ConstraintNLSTATIC106ADVNL601,106ADVNL601,129SolvesanFEmodelthatisdefinedforonlyasectioncutononesideofthea*isofana*isymmetricpart.Thisgreatlyreducesthedegreesoffreedom(DOF)andhencealsosignificantlyreducessolutiontime.N*NastranthermalanalysisandsolutiontypesAnalysistypeSolutiontypeDescriptionSteadyStateHeatTransferNLSCSH153Thermalanalysis.A*isymmetricThermalNLSCSH153ThermalanalysisforanFEmodelthatisdefinedforonlyasectioncutononesideofthea*isofana*isymmetricpart.線性靜態(tài)分析SupportedlinearstaticanalysistypesInAdvancedSimulation,youcanchoosefromthefollowinglinearstaticanalysistypeswhenyoucreateastructuralsolution.SolverSolutiontypeN*NastranMSCNastranSESTATIC101-SingleConstraintN*NastranMSCNastranSESTATIC101-Multi-ConstraintANSYSLinearStaticsABAQUSStaticPerturbationsubstepUsingmaterialsforalinearstaticanalysisMaterialtypesthatcanbeusedinalinearstaticanalysisinclude:IsotropicOrthotropicAnisotropicLaminateDefiningboundaryconditionsforalinearstaticanalysisBoundaryconditionsforlinearstaticanalysiscanbegeometry-basedorfiniteelement-based.E*amplesinclude:PointandedgeforcesFaceloadsTemperatureloadsDisplacementconstraintsCoupleddegreesoffreedomUsingtheiterativesolverYoucanturnontheElementIterativeSolveroptionontheSolutiondialogbo*,orwhenyouarepromptedafteryoustartasolve.Theiterativesolver:Canbefaster,useslessmemory,andhasfewerdiskrequirementsthanthestandardsparsematri*solver.Canbeusedforalinearstaticanalysisthatdoesnotincludecontact.Showsthebestperformancegainwithmodelsposedmostlyofsolidelements.Isveryefficientformodelsposedmostlyofparabolictetrahedralelements.模態(tài)分析SupportedmodalanalysistypesInAdvancedSimulation,youcanchoosefromthefollowingmodalanalysistypeswhenyoucreateastructuralsolution:SolverSolutiontypeN*NastranSEMODES103SEMODES103-ResponseSimulationSEMODES103-SuperelementSEMODES103-Fle*ibleBodyMSCNastranSEMODES103SEMODES103-SuperelementANSYSModalABAQUSFrequencyPerturbationsubstepUsingmaterialsforamodalanalysisMaterialtypesthatcanbeusedinamodalanalysisinclude:IsotropicOrthotropicAnisotropicFluidDefiningboundaryconditionsforamodalanalysisBoundaryconditionsformodalanalysisincludeconstraintsandgluing,suchas:Displacementconstraints.Coupleddegreesoffreedom.Surface-to-surfacegluingSettingmodalsolutionattributesForamodalanalysis,someoftheN*Nastransolutionattributesinclude:Ma*JobTimeOutputRequestsRealEigenvalueE*tractionData.Identifiesthetypeofsolve:LanczosorHouseholder.LanczosMethodorHouseholderMethod.Themethodspecifiestherealeigenvaluee*tractionoptionsforthesolution.Eigenvaluee*tractionoptionsarestoredasasolver-specificobject.Lanczosistheremendedmethodformostmodels;Householderisremendedforsmallermodels.Theoptionsincludefrequencyrangelowerandupperlimits,andthenumberofdesiredmodes.DefaultTemperatureFormoreinformation,seeSolversandSolutions→SettingNastranSolutionOptionsintheAdvancedSimulationonlineHelp.ReviewingmodalanalysisresultsNaturalfrequenciesandmodeshapesaretheprimaryresultsforamodalsolution.Theresultsareorderedbyfrequency,withthelowestnaturalfrequencybeingthefirstmodeshape,thene*thighestbeingthesecondmode,andsoon.Thenormalmodesrepresentdynamicstatesinwhichtheelasticandinertialforcesarebalancedwhennoe*ternalloadsareapplied.Themagnitudeofthemodeshapesisarbitrary.Theamplitudeofthedisplacementisnotsignificant,buttherelativedisplacementofthenodesissignificant.Modeshapeshelpyoudeterminewhatloadlocationsanddirectionswille*citethestructure.如何判斷模態(tài)的頻率Thefirst6modeshavee*tremelylowfrequencies.Thesearerigidbodymodes.Mode7representsthefirstfle*iblemodewithanaturalfrequencyofabout133Hz.線性曲屈分析BucklinganalysisintroductionBucklinganalysis:Determinesbucklingloadsandbuckledmodeshapes.Abucklingloadisthecriticalloadatwhichastructurebeesunstable.Abuckledmodeshapeisthecharacteristicshapeassociatedwithastructure'sbuckledresponse.Identifiesthecriticalloadfactor,whichisthevaluethatcanbemultipliedbytheappliedloadtocausebuckling.LinearbucklingassumptionsThebucklinganalysisuseslineartheory.Thefollowingassumptionsandlimitationsapply:Thedeflectionspriortobucklingaresmall.Thereferenceequilibriumconfigurationistheinitialgeometryofthepart.Theresponseofthestructurepriortobucklinge*hibitsalinearrelationshipbetweenstressandstrain.Post-bucklingbehaviorisnotpredictedSupportedbucklinganalysistypesInAdvancedSimulation,youcanchoosefromthefollowingbucklinganalysistypeswhenyoucreateabucklingsolution:SolverSolutiontypeN*NastranMSCNastranSEBUCKL105ANSYSBucklingABAQUSBucklingPerturbationSubstepUsingmaterialsforabucklinganalysisMaterialtypesthatcanbeusedinabucklinganalysisinclude:IsotropicOrthotropicAnisotropicDefiningboundaryconditionsforabucklinganalysisForabucklinganalysis:Defineconstraints.Constrainthemodelasyouwouldforalinearstaticanalysis.Applyloads.Theloadsetcancontainmorethanoneloadtype(Force,Pressure),buteveryloadwillbescaledbytheloadfactor.Amagnitudeof1isoftenusedwhenasingleloadtypewillcausethemodeltobuckle.ReviewingbucklinganalysisresultsForN*Nastranresults,bucklinganalysisresultsarelistedas:Asetofstaticanalysisresultsforthebucklingloadssubcase.Asetofmodesforthebucklingmethodssubcase.Eachmodehasaneigenvalue(loadfactor)listed.Theappliedloadmultipliedbythebucklingloadfactoristheloadatwhichthepartwillbuckle.Thefirstmodehasthelowestbucklingloadfactorandisusuallythemodeofmostinterest.Ifthebucklingloadfactorisbelow1,theparthasbuckled.如果eigenvalue小于1，則這個(gè)模型就已經(jīng)發(fā)生曲屈。ThecriticalloadistheproductoftheappliedloadandtheeigenvalueforMode1.比方在本例中施加的載荷為1N,而Mode1的對(duì)應(yīng)值為1380，則這個(gè)臨界載荷為1*1380N.NonlinearstaticanalysisintroductionThenonlinearsolutiontypesNLSTATIC106andADVNL601,106arecapableofsimulatingthefollowingconditions:geometricnonlinear,materialplasticity,andhyperelasticity.Thisintroductionpresentstwoofthesenonlinearconditions:Materialplasticity–Materialdataisenteredthatdescribesboththelinearelasticandtheplasticyieldportionofthestressstraincurve.Geometricnonlinear–Pressureloadsandelementstiffnessareupdatedasthesolutioniterates.Largegeometrydisplacementsandrotationaresupported.NLSTATIC106andADVNL601,106solutionscanincludematerialplasticityandgeometricconditionsseparatelyorsimultaneously.SupportednonlinearsolutiontypesInAdvancedSimulation,youcanchoosefromthefollowingnonlinearsolutiontypeswhentheAnalysisTypeissettoStructural.SolverSolutiontypeN*NastranNLSTATIC106ADVNL601,106ADVNL601,129ADVNL701MSCNastranNLSTATIC106ANSYSNonlinearStaticsABAQUSGeneralAnalysisWhethertouseanonlinearsolutionAnSESTATIC101linearstaticsolution:Calculatestheelementstiffness(K)matri*onceatthebeginningofthesolution.AssumesHooke'slaw,Force=KU,tocalculatedisplacements(U).Doesnotaccountforlargedisplacementsandrotation.Willnotupdatepressureloaddirections.AnNLSTATIC106orADVNL601,106solutionwithgeometricnonlinearconditions:Iterates(迭代)tofollowanonlinearforce/displacementpath.Periodically〔定期的〕updatestheelementstiffnessmatri*whilefollowingthenonlinearforce/displacementpath.Usesastraindefinitionwhichaccountsforlargedisplacementsandrotations.Usesthecurrentconfigurationofadeformedstructuretodeterminethedirectionofpressureloads.Astiffnesschangemaybearesultofbothgeometryandmaterialnonlineareffectsifbothareincludedintheanalysis.幾何非線性UsingelementsforsolutiontypeNLSTATIC106ForsolutiontypeNLSTATIC106,nonlinearelementsmaybebinedwithlinearelementsforputationalefficiencyifthenonlineareffectscanbelocalized.Thesupportednonlinearelementsinclude:3D4-nodedand10-nodedtetrahedralsolidelements.3D8-nodedhe*ahedralsolidelements.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-nodedhe*ahedralsolidelements.3D6-nodedand15-nodedpentagonalsolidelements.3D5-nodedand13-nodedpyramidsolidelements.3D4-nodedand8-nodedor3-nodedand6-nodeda*isymmetricthinshellelements.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.IntheIsotropicMaterialdialogbo*,enteranInitialYieldPoint(LIMIT1)value.Thisvaluemustmatchthesecondstressvalueinthestress-straintable.DefiningboundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,106BoundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,106canbegeometry-basedorfiniteelement-based.E*amplesinclude: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.Somee*amplesare:AnalysisControl—SettingtheAutomaticIncrementationSchemetoATSautomaticallysubdividestimestepsthatfailtoconverge.Equilibrium—Canbeusedtoadjustthedefaultconvergenceoptionsandtolerances.Also,thelinesearchiterationschemecanbeselectedhere.Contact—Controlscontactoptionsforallcontactsets.響應(yīng)仿真主要就是用于確定構(gòu)造模型對(duì)于一系列載荷工況的動(dòng)態(tài)或靜態(tài)響應(yīng)仿真步驟StepSummary1.Buildthefiniteelement(FE)model.Definethegeometry,materialproperties,mesh,andconstraints,asyouwouldforotherstructuralsolutiontypes.Also,specifythelocationsofyoure*citationsanddefineanystaticanddynamicloads.2.CreatetheN*Nastransolution.CreateanN*NastranSEMODES103–ResponseSimulationsolution.YoucanalsouseanSEMODES103solution,butitgeneratesonlythenormalmodes.3.Solvethemodel.N*Nastrangeneratesnormalmodes,constraintmodes,attachmentmodes,andothermodalinformation.4.CreatetheResponseSimulation.Aftersolvingthemodel,createtheResponseSimulationsolutionprocess.5.Reviewthemodeshapes.ReviewthemodeshapesinthePost-ProcessingNavigatororintheResponseSimulationDetailsViewsubpanelintheSimulationNavigator.6.Definethedampingvaluesforeachmode.IntheResponseSimulationDetailsViewsubpanel,youcanaddviscousandhystereticdamping.7.Createanevent.Definethetypeofresponsesimulationyouwillperform,suchastransientorfrequency.Theeventbinesthemodalmodelandyoure*citationfunctions.8.Createe*citationfunctions.E*citationsdefinetheloadingfortheresponsesimulation,suchasavehicle'stiresfollowingabump'sprofile.9.Analyzethemodel'sdynamicresponsestothee*citations.Dependingonthetypeofresponseyouareevaluating,thesoftwarecalculatesandstorestheresultsinresponsefunctionsorresponseresultssets.Responsefunctionseachcontainoneresponse(fore*ample,stressatonenode)asafunctionoftimeorfrequency.YoucanplotthesefunctionrecordsintheN*graphicswindow.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。TypeDescriptionEnforcedmotionlocationThelocationofanenforcedmotione*citationonthemodel.Thisisalocationonly;youdefinetheactuale*citationloadafteryousolvethesolution.Thesolvergeneratesconstraintmodes,equivalentattachmentmodes,andeffectivemassesbasedontheselocations.CreateenforcedmotionlocationsintheConstraintscontainerintheSimulationNavigator.NodalForcelocationThelocationofanodalforcee*citationonthemodel.Thisisalocationonly;youdefinetheactuale*citationafteryousolvethesolution.Thesolvergeneratesattachmentmodesbasedontheselocations.CreatenodalforcelocationsintheLoadscontainerintheSimulationNavigator.StaticoffsetloadForTransientevents,aconstantloadforscalingtheresults(fore*ample,agravityloadforusewithconcentratedmasselements,oradistributedwindloadonthestructure).CreatestaticoffsetloadsintheSubcase–StaticOffsetcontainerintheSimulationNavigator.Afteryousolvethesolutionandcreateanevent,theStaticOffsetnodeappearsintheSimulationNavigatorundertheeventnode.Youcane*cludethestaticoffsetresultsfromtheresponseevaluationbyright-clickingtheStaticOffsetnodeandchoosingDeactivate.StressstiffeningloadAdifferentialstiffnesstoaccountfortheweakeningofastructureduetostress.Youcanusethisloadtopre-stressstructuresthatarethininoneortwodimensions,suchasshellorcable-likestructureswithsmallinitialstiffness,andlargemembraneloads,suchasadrumheadwithinitialtension.Thesolverusestheseloadstoaugmentthestiffnessinthenormalmodecalculations.Itcalculatesthestressstiffnessandbinesitwiththelinearstiffnessandthenusesthebinationofthesetwomatricestosolvethenormalmodeseigenvalueproblem.CreatestressstiffeningloadsintheSubcase–StressStiffeningcontainerintheSimulationNavigator.DynamicloadAloadyoucanscaleaftersolvingthemodalsolution.Thesolvergeneratesaloadsetanddistributedattachmentmodesforeachdynamicload.Youcanthenassignascalingfunctionwhenyoucreateane*citation.Dynamicloadsarenecessaryforapplyingdistributed-loade*citationsandcanalsobeusedasstatice*citationsinaQuasi-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)展求解了。頻率響應(yīng)函數(shù)(FRF)用來(lái)評(píng)估一個(gè)或幾個(gè)節(jié)點(diǎn)或單元的對(duì)于輸入的單位載荷的響應(yīng)傳遞性〔transmissibilit〕可以用來(lái)評(píng)估一個(gè)或幾個(gè)節(jié)點(diǎn)對(duì)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)構(gòu)造在隨時(shí)間變的的鼓勵(lì)載荷下的動(dòng)態(tài)響應(yīng)主要適用于比方驅(qū)車在一個(gè)車道上行駛或其它的任何的構(gòu)造在一段時(shí)間受鼓勵(lì)載荷的影響頻率響應(yīng)構(gòu)造受一組振蕩載荷的作用由于發(fā)動(dòng)機(jī)的振動(dòng)或車輪的不平衡對(duì)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)resultsofastructuretooneormoresimultaneousrandome*citations.E*amplesofrandome*citationsincludejetenginenoise,aprofileofaroadsurface,andtheeffectsofturbulenceonanairplane.普分析(alsocalledshockresponsespectrum)Thepeakresponseofastructuretoasetofsimultaneousbasee*citationsdefinedbyresponsespectrumfunctions.分析實(shí)例主要有：航空著陸,核超壓分析,墜落實(shí)驗(yàn),地震分析DDAM(DynamicDesignAnalysisMethod)Thedynamicresponseofaship'sponentstoshocksappliedtotheship'shull,deck,orshellplatingmountings.YoucandefineyourproprietaryshockcoefficientsasinputtotheDDAMevent.Youpredefinethesecoefficientsinate*tfile.Thenyoucanenteramultipliertoadjustthemeachtimeyouperformtheresponseevaluation.Quasi-StaticThestaticresponseofastructuretoasetofsimultaneoustime-varyingstatice*citations.Thiseventtypeisusefulifyouareonlyinterestedinstaticresultsandneedfastersolutionperformancethanafulldynamicsolution.E*citationloads鼓勵(lì)載荷主要有以下幾種：首先鼓勵(lì)載荷是一種外部載荷。比方說(shuō)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-loade*citationdefinedbyscalingaloadthatyoupredefinedinthesolution(Transient,Frequency,orRandomeventsonly).Constantvelocityimpactordropimpactappliedtoasinglenode(usinganautomaticallygeneratedhaversinefunction).Rotatingforcedefinedaseitherageneralrotatingforceoranunbalancedrotatingmassaboutagivena*is(Frequencyeventsonly).FunctiontoolsforResponseSimulationutilityThisutilityprovidesusefulfunctionmandssuchas:Easycreationofe*citationfunctions,suchaspulse〔脈沖〕,randomsignal,andramp〔斜坡函數(shù)〕functionsDisplacement,velocity,andaccelerationdataconversion〔數(shù)據(jù)轉(zhuǎn)換〕Time,frequency,SRS,andPSDdataconversionInterpolationEnvelopelineEquationbinationN*NastranPunchfileconversionfornodalresultsSensors傳感器就是你在模型中定義的*個(gè)節(jié)點(diǎn)，你想在此節(jié)點(diǎn)處觀察響應(yīng)結(jié)果.比方傳感器可以代表加速計(jì)的位置。Sensorsallowyoutoevaluatedisplacement,velocity,acceleration,andreactionforce.Eachnodeyouselectinyoursensordefinitiongeneratesaresponsefunction.Sensorsarestoredwithnamesthatreflectthenodeanddirectioninwhichthesensorevaluates.Fore*ample,Sensor_1_2_(99*+)_1representsthefunction2resultforSensor_1atnode99inthepositive*direction.StraingagesUseastraingagetospecifyanodalorelementallocationonthemodelatwhichtoevaluatestressorstrainresultsinaspecifieddirection.Straingagesdefine:LocationCoordinatesystemforthestressorstrainresultsponentsofthestressorstrainresults在響應(yīng)仿真的求解過(guò)程中也包含了模態(tài)響應(yīng)的過(guò)程，而且如果模態(tài)數(shù)設(shè)置的越多，則求解結(jié)果會(huì)越準(zhǔn)確。這個(gè)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)展如下的特殊設(shè)置其它后處理1.當(dāng)然在此過(guò)程之前應(yīng)先定義一個(gè)響應(yīng)函數(shù)產(chǎn)生整個(gè)模型在極值點(diǎn)處的響應(yīng)RunaResponseResultsevaluation.IntheEvaluateResponseResultsdialogbo*,selectStressastheRequestedResult(cleartheDisplacementcheckbo*).Selectalltheelementsinthemodel.SelectFrom*YGraphastheMethod.UnderPointValue,clickthebutton.IntheEquationSelectionlist,select2_(16E_VONMTOP).Intheplottedelementalstressfunction,selectthetimepointwherestressishighest,andthenclickOKtogeneratetheresponseresults.柔體分析定義：在運(yùn)動(dòng)仿真的過(guò)程中只是根據(jù)一定的約束條件，剛性體作一定的運(yùn)動(dòng)，它不含有任何的動(dòng)態(tài)分析的特性，尤其是在以下情況下：顯著的影響或運(yùn)動(dòng)的突然改變或是剛性桿件具有中夠的柔性而防礙運(yùn)動(dòng)的情況。Fle*iblebodiesworkflowAdvancedSimulationstepsCreateafiniteelementmodelandN*NastranSEMODES103–Fle*ibleBodysolution.Meshthefle*ibleponentanddefinematerialproperties.Usea1DConnection(spiderelement)orotherconstraintelementstodefinetheponent'sconnectionpointstothemechanism.AddFi*edBoundaryDegreesofFreedomconstraintstodefineconnectiondegreesoffreedom.AddFreeBoundaryDegreesofFreedom