UG有限元高级仿真真正有用的资料.docx

UG有限元高级仿真真正有用的资料.docx

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UG有限元高级仿真真正有用的资料

高级仿真

高级仿真1

NXNastranstructuralanalysisandsolutiontypes2

NXNastranthermalanalysisandsolutiontypes4

线性静态分析4

Supportedlinearstaticanalysistypes4

Usingmaterialsforalinearstaticanalysis5

Definingboundaryconditionsforalinearstaticanalysis5

Usingtheiterativesolver5

模态分析6

Supportedmodalanalysistypes6

Usingmaterialsforamodalanalysis7

Definingboundaryconditionsforamodalanalysis7

Settingmodalsolutionattributes7

Reviewingmodalanalysisresults8

如何判断模态的频率9

线性曲屈分析9

Bucklinganalysisintroduction9

Linearbucklingassumptions10

Supportedbucklinganalysistypes10

Usingmaterialsforabucklinganalysis10

Definingboundaryconditionsforabucklinganalysis10

Reviewingbucklinganalysisresults11

Nonlinearstaticanalysisintroduction11

Supportednonlinearsolutiontypes12

Whethertouseanonlinearsolution12

UsingelementsforsolutiontypeNLSTATIC10613

UsingelementsforsolutiontypeADVNL601,10613

UsingmaterialsforsolutiontypesNLSTATIC106andADVNL601,10614

Enteringstress/straindataforsolutiontypesNLSTATIC106andADVNL601,10614

DefiningboundaryconditionsforsolutiontypesNLSTATIC106andADVNL601,10615

NLSTATIC106的求解设置15

ADVNL601,106的求解设置16

响应仿真17

仿真步骤17

Specialboundaryconditions18

SolutionattributesforResponseSimulation20

FRFandTransmissibility20

Analysisevents21

Excitationloads22

FunctiontoolsforResponseSimulationutility22

Sensors23

Straingages23

产生整个模型在极值点处的响应24

柔体分析24

Flexiblebodiesworkflow24

AdvancedSimulationsteps24

MotionSimulationsteps25

ConnectingtheflexiblebodyFEMtothemechanism25

Definingconnectionandloaddegreesoffreedom25

NXNastranstructuralanalysisandsolutiontypes

Analysistype

Solutiontype

Description

LinearStatic

SESTATIC101–SingleConstraint

SESTATIC101–Multi-Constraint

SESTATIC101–Superelement

Structuralsolveusedtosolvelinearandsomenonlinearproblems,suchasgapsandcontactelements.

ModalAnalysis

SEMODES103

SEMODES103–ResponseSimulation

SEMODES103–Superelement

SEMODES103–FlexibleBody

Evaluatesnormalmodesandnaturalfrequencies.

LinearBuckling

SEBUCKL105

Determinesbucklingloadsandbuckledmodeshapes.

NonlinearStatics

NLSTATIC106

Considersgeometricandmaterialnonlinearbehavior.

DirectFrequencyResponse

SEDFREQ108

Frequencyresponseiscalculateddirectly（withoutnormalmodes）.

DirectTransientResponse

SEDTRAN109

Transientresponseiscalculateddirectly（withoutnormalmodes）.

ModalFrequencyResponse

SEMFREQ111

Frequencyresponseisbasedonpreviouslysolvednormalmodes.

ModalTransientResponse

SEMTRAN112

Transientresponseisbasedonpreviouslysolvednormalmodes.

NonlinearTransientResponse

NLTRAN129

Dynamictransientresponseiscalculated,whichincludes（NLSTATIC106）nonlinearconditions.

AdvancedNonlinearStatics（implicit）

ADVNL601,106

Considersgeometricandmaterialnonlinearbehavior.

AdvancedNonlinearTransientResponse（implicit）

ADVNL601,129

Dynamictransientresponseiscalculated,whichincludesnonlinearconditions.

AdvancedNonlinearDynamicAnalysis（explicit）

ADVNL701

Calculatesdynamicresponseswithnonlineareffects.

DesignOptimization

DESOPT200

Adjuststhedefineddesignvariableswithinthelimitsyouspecifyasitsearchesfortheoptimumconditions,whileworkinginthescopeofyouroveralloptimizationobjectiveandoutputconstraints.

AxisymmetricStructural

SESTATIC101-Multi-Constraint

NLSTATIC106

ADVNL601,106

ADVNL601,129

SolvesanFEmodelthatisdefinedforonlyasectioncutononesideoftheaxisofanaxisymmetricpart.Thisgreatlyreducesthedegreesoffreedom（DOF）andhencealsosignificantlyreducessolutiontime.

NXNastranthermalanalysisandsolutiontypes

Analysistype

Solutiontype

Description

SteadyStateHeatTransfer

NLSCSH153

Thermalanalysis.

AxisymmetricThermal

NLSCSH153

ThermalanalysisforanFEmodelthatisdefinedforonlyasectioncutononesideoftheaxisofanaxisymmetricpart.

线性静态分析

Supportedlinearstaticanalysistypes

InAdvancedSimulation,youcanchoosefromthefollowinglinearstaticanalysistypeswhenyoucreateastructuralsolution.

Solver

Solutiontype

NXNastran

MSCNastran

SESTATIC101-SingleConstraint

NXNastran

MSCNastran

SESTATIC101-Multi-Constraint

ANSYS

LinearStatics

ABAQUS

StaticPerturbationsubstep

Usingmaterialsforalinearstaticanalysis

Materialtypesthatcanbeusedinalinearstaticanalysisinclude:

∙Isotropic

∙Orthotropic

∙Anisotropic

∙Laminate

Definingboundaryconditionsforalinearstaticanalysis

Boundaryconditionsforlinearstaticanalysiscanbegeometry-basedorfiniteelement-based.Examplesinclude:

∙Pointandedgeforces

∙Faceloads

∙Temperatureloads

∙Displacementconstraints

∙Coupleddegreesoffreedom

Usingtheiterativesolver

YoucanturnontheElementIterativeSolveroptionontheSolutiondialogbox,orwhenyouarepromptedafteryoustartasolve.

Theiterativesolver:

∙Canbefaster,useslessmemory,andhasfewerdiskrequirementsthanthestandardsparsematrixsolver.

∙Canbeusedforalinearstaticanalysisthatdoesnotincludecontact.

∙Showsthebestperformancegainwithmodelscomposedmostlyofsolidelements.

∙Isveryefficientformodelscomposedmostlyofparabolictetrahedralelements.

模态分析

Supportedmodalanalysistypes

InAdvancedSimulation,youcanchoosefromthefollowingmodalanalysistypeswhenyoucreateastructuralsolution:

Solver

Solutiontype

NXNastran

SEMODES103

SEMODES103-ResponseSimulation

SEMODES103-Superelement

SEMODES103-FlexibleBody

MSCNastran

SEMODES103

SEMODES103-Superelement

ANSYS

Modal

ABAQUS

FrequencyPerturbationsubstep

Usingmaterialsforamodalanalysis

Materialtypesthatcanbeusedinamodalanalysisinclude:

∙Isotropic

∙Orthotropic

∙Anisotropic

∙Fluid

Definingboundaryconditionsforamodalanalysis

Boundaryconditionsformodalanalysisincludeconstraintsandgluing,suchas:

∙Displacementconstraints.

∙Coupleddegreesoffreedom.

∙Surface-to-surfacegluing

Settingmodalsolutionattributes

Foramodalanalysis,someoftheNXNastransolutionattributesinclude:

∙MaxJobTime

∙OutputRequests

∙RealEigenvalueExtractionData.Identifiesthetypeofsolve:

LanczosorHouseholder.

∙LanczosMethodorHouseholderMethod.Themethodspecifiestherealeigenvalueextractionoptionsforthesolution.Eigenvalueextractionoptionsarestoredasasolver-specificobject.Lanczosistherecommendedmethodformostmodels;Householderisrecommendedforsmallermodels.

Theoptionsincludefrequencyrangelowerandupperlimits,andthenumberofdesiredmodes.

∙DefaultTemperature

Formoreinformation,seeSolversandSolutions→SettingNastranSolutionOptionsintheAdvancedSimulationonlineHelp.

Reviewingmodalanalysisresults

Naturalfrequenciesandmodeshapesaretheprimaryresultsforamodalsolution.

∙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

Bucklinganalysisintroduction

Bucklinganalysis:

∙Determinesbucklingloadsandbuckledmodeshapes.

oAbucklingloadisthecriticalloadatwhichastructurebecomesunstable.

oAbuckledmodeshapeisthecharacteristicshapeassociatedwithastructure'sbuckledresponse.

∙Identifiesthecriticalloadfactor,whichisthevaluethatcanbemultipliedbytheappliedloadtocausebuckling.

Linearbucklingassumptions

Thebucklinganalysisuseslineartheory.Thefollowingassumptionsandlimitationsapply:

∙Thedeflectionspriortobucklingaresmall.

∙Thereferenceequilibriumconfigurationistheinitialgeometryofthepart.

∙Theresponseofthestructurepriortobucklingexhibitsalinearrelationshipbetweenstressandstrain.

∙Post-bucklingbehaviorisnotpredicted

Supportedbucklinganalysistypes

InAdvancedSimulation,youcanchoosefromthefollowingbucklinganalysistypeswhenyoucreateabucklingsolution:

Solver

Solutiontype

NXNastran

MSCNastran

SEBUCKL105

ANSYS

Buckling

ABAQUS

BucklingPerturbationSubstep

Usingmaterialsforabucklinganalysis

Materialtypesthatcanbeusedinabucklinganalysisinclude:

∙Isotropic

∙Orthotropic

∙Anisotropic

Definingboundaryconditionsforabucklinganalysis

Forabucklinganalysis:

1.Defineconstraints.Constrainthemodelasyouwouldforalinearstaticanalysis.

2.Applyloads.Theloadsetcancontainmorethanoneloadtype（Force,Pressure）,buteveryloadwillbescaledbytheloadfactor.Amagnitudeof1isoftenusedwhenasingleloadtypewillcausethemodeltobuckle.

Reviewingbucklinganalysisresults

ForNXNastranresults,bucklinganalysisresultsarelistedas:

∙Asetofstaticanalysisresultsforthebucklingloadssubcase.

∙Asetofmodesforthebucklingmethodssubcase.

oEachmodehasaneigenvalue（loadfactor）listed.

oTheappliedloadmultipliedbythebucklingloadfactoristheloadatwhichthepartwill