2009JaysonMartinez&HormozZareh1PortlandStateUniversity,MechanicalEngineering

Abaqus/CAEVibrationsTutorial

ProblemDescription

Thetableframe,madeofsteelboxsections,isfixedattheendofeachleg.Determinethefirst10eigenvaluesandnaturalfrequencies.

WARNING:ThereisnopredefinedsystemofunitswithinAbaqus,sotheuserisresponsibleforensuringthatthecorrectvaluesarespecified.HereweuseSIunits

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AnalysisSteps1. StartAbaqusandchoosetocreateanewmodeldatabase2. InthemodeltreedoubleclickonthePartsnode(orrightclickonpartsandselectCreate)

3. IntheCreatePartdialogbox(shownabove)namethepartand

a. Select3Db. SelectDeformablec. SelectWired. Setapproximatesize=5(Notimportant,determinessizeofgridtodisplay)e. ClickContinuef. Createthesketchshownbelow

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4. InthetoolboxareaclickontheCreateDatumPlane:OffsetFromPrinciplePlaneicona. SelecttheXYPlaneandenteravalueof1fortheoffset

5. InthetoolboxareaclickontheCreateWire:Planaricona. Clickontheoutlineofthedatumplanecreatedinthepreviousstepb. Selectanyoneofthelinestoappearverticalandontherightc. InthetoolboxareaclickontheProjectEdgesicond. SelectallofthelinesintheviewportandclickDone

6. InthetoolboxareaclickontheCreateDatumPlane:3pointsicon(clickonthesmallblacktriangleinthebottomrightcorneroftheicontogetallofthedatumplaneoptions)

a. Select3pointsonthetopofthegeometry

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7. InthetoolboxareaclickontheCreateWire:Planaricona. Clickontheoutlineofthedatumplanecreatedinthepreviousstepb. Selectanyoneofthelinestoappearverticalandontherightc. Sketchtwolinestoconnectfinishthewireframeofthetabled. ClickonDone

8. DoubleclickontheMaterialsnodeinthemodeltree

a. Namethenewmaterialandgiveitadescriptionb. ClickontheMechanicaltabElasticityElasticc. DefineYoungsModulus(210e9)andPoissonsRatio(0.25)

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d. ClickontheGeneraltabDensitye. Density=7800f. ClickOK

9. DoubleclickontheProfilesnodeinthemodeltreea. NametheprofileandselectBoxfortheshapeb. ClickContinuec. Enterthevaluesfortheprofileshownbelowd. ClickOK

10. DoubleclickontheSectionsnodeinthemodeltree

a. NamethesectionBeamPropertiesandselectBeamforboththecategoryandthetypeb. ClickContinuec. LeavethesectionintegrationsettoDuringAnalysisd. Selecttheprofilecreatedabove(BoxProfile)e. Selectthematerialcreatedabove(Steel)f. ClickOK

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11. ExpandthePartsnodeinthemodeltree,expandthenodeofthepartjustcreated,anddoubleclickon

SectionAssignmentsa. Selecttheentiregeometryintheviewportb. Selectthesectioncreatedabove(BeamProperties)c. ClickOK

12. ExpandtheAssemblynodeinthemodeltreeandthendoubleclickonInstances

a. SelectDependentfortheinstancetypeb. ClickOK

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13. DoubleclickontheStepsnodeinthemodeltreea. Namethestep,settheproceduretoLinearperturbation,andselectFrequencyb. ClickContinuec. Givethestepadescriptiond. SelectLanczosfortheEigensolvere. SelecttheradiobuttonValueunderNumberofeigenvaluesrequestedandenter10f. ClickOK

14. DoubleclickontheBCsnodeinthemodeltreea. NametheboundaryconditionedFixedandselectSymmetry/Antisymmetry/Encastreforthetypeb. ClickContinuec. SelecttheendofeachlegandpressDoneinthepromptaread. SelectENCASTREfortheboundarycondition(ENCASTREmeanscompletelyfixed/clamped)e. ClickOK

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15. InthemodeltreedoubleclickonMeshfortheTableframepart,andinthetoolboxareaclickontheAssignElementTypeicon

a. SelectStandardforelementtypeb. SelectLinearforgeometricorderc. SelectBeamforfamilyd. ClickOK

16. InthetoolboxareaclickontheSeedParticona. Settheapproximateglobalsizeto0.1

17. InthetoolboxareaclickontheMeshParticona. ClickYesinthepromptarea

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18. InthemenubarselectViewPartDisplayOptionsa. ChecktheRenderbeamprofilesoptionb. ClickOK

19. ChangetheModuletoPropertya. ClickontheAssignBeamOrientationiconb. SelecttheportionsofthegeometrythatareperpendiculartotheZaxisc. ClickDoneinthepromptaread. Acceptthedefaultvalueoftheapproximaten1direction(0,0,1)e. ClickOKinthepromptarea

f. SelecttheportionsofthegeometrythatareparalleltotheZaxis

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g. ClickDoneinthepromptareah. EnteravectorthatisperpendiculartotheZaxisfortheapproximaten1direction(i.e.0,1,0)

i. ClickOKfollowedbyDoneinthepromptarea20. InthemodeltreedoubleclickontheJobnode

j. NamethejobTableFramek. ClickContinuel. Givethejobadescriptionm. ClickOK

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21. Inthemodeltreerightclickonthejobjustcreated(TableFrame)andselectSubmitn. WhileAbaqusissolvingtheproblemrightclickonthejobsubmitted(TableFrame),andselectMonitor

o. IntheMonitorwindowcheckthattherearenoerrorsorwarnings

i. Ifthereareerrors,investigatethecause(s)beforeresolvingii. Iftherearewarnings,determineifthewarningsarerelevant,somewarningscanbesafely

ignored

22. Inthemodeltreerightclickonthesubmittedandsuccessfullycompletedjob(TableFrame),andselectResults

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23. InthemenubarclickonViewportViewportAnnotationsOptionsp. ThelocationsofviewportitemscanbespecifiedonthecorrespondingtabintheViewportAnnotations

Optionsq. ClickOK

24. Displaythedeformedcontouroverlaidwiththeundeformedgeometryr. Inthetoolboxareaclickonthefollowingicons

iii. PlotContoursonDeformedShapeiv. AllowMultiplePlotStatesv. PlotUndeformedShape

25. InthemenubarclickonResultsStep/Frames. ChangethemodebydoubleclickingintheFrameportionofthewindowt. Observetheeigenvaluesandfrequenciesu. Leavethedialogueboxopentobeabletoswitchthemodeshapeswhileanimating

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26. InthetoolboxareaclickonAnimationOptionsv. ChangetheModetoSwingw. ClickOKx. AnimatebyclickingonAnimate:ScaleFactoriconinthetoolboxarea

27. ClickonadifferentFrameintheStep/Framedialogueboxtochangethemode28. ExpandtheTableFrame.odbnodeintheresulttree,expandtheHistoryOutputnode,andrightclickon

Eigenfrequency:y. SelectSaveAsz. Name=Frequencies

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aa. RepeatforEigenvaluebb. ObservetheXYDatanodesintheresulttree

29. InthemenubarclickonReportXY

cc. Selectfrom=AllXYdatadd. HighlightEigenvaluesee. ClickontheSetuptabff. ClickSelectandspecifythedesirednameandlocationofthereportgg. ClickApplyhh. ClickontheXYDatatabii. HighlightFrequenciesjj. ClickOK

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30. Openthereport(.rptfile)withanytexteditor

Note:Eigenvaluesthatareidenticalindicatesimilarvibrationmodes,activatedindifferentplanes.