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1、Workshop3:HarmonicResponse(Fixed-FixedBeam)ANSYSMechanicalDynamicsANSYS,Inc.ProprietaryWS3-1July2009©2009ANSYS,Inc.Allrightsreserved.Inventory#002666Workshop3-GoalsTrainingManual•Ourgoalistodeterminetheharmonicresponseofafixed-fixedbeamundertheinfluenceoftwoharmonicforc
2、es.–Theforcesrepresentrotatingmachinesmountedatthe“one-third”pointsalongthebeam.–Themachinesrotateat300to1800RPM.•TheBeam(3mx0.5mx25mm)ismadeofSteel.Constrain(Fix)BothEndsANSYS,Inc.ProprietaryWS3-2July2009©2009ANSYS,Inc.Allrightsreserved.Inventory#002666Workshop3–Projec
3、tSchematicTrainingManual•Fromtheprojectschematic,insertanewModalsystem.–wewillfirstlookatthenaturalfrequenciesandmodeshapesofthesystem•DropaHarmonicResponsesystemontotheModelcelloftheModalsystemtosharethematerialproperties,geometry,andmesh.–notethatthissystemwillnotuset
4、hemodesfromtheModalsystem•ImporttheGeometryfile–beam.agdbANSYS,Inc.ProprietaryWS3-3July2009©2009ANSYS,Inc.Allrightsreserved.Inventory#002666Workshop3-PreprocessingTrainingManual•EdittheModelcelltoopentheMechanicalapplication.–verifythatthematerialassignmentisStructuralS
5、teelANSYS,Inc.ProprietaryWS3-4July2009©2009ANSYS,Inc.Allrightsreserved.Inventory#002666Workshop3-EnvironmentTrainingManual•ConstrainbothendsoftheBeam.–ClickontheModalBranchand>Insert>FixedSupport.–Switchtoedgeselectionmodeasnecessary–UseLMBtopickthetwoapplicableedges.–H
6、oldtoaddtoyourselections–Click“Apply”intheDetailswindowANSYS,Inc.ProprietaryWS3-5July2009©2009ANSYS,Inc.Allrightsreserved.Inventory#002666Workshop3–ModalResultsTrainingManual•SolvetheModalanalysis.•CreatesomeModeShapeResultstoreviewtheresults.–notethatmodes1and2fa
7、llbetween0and50HzANSYS,Inc.ProprietaryWS3-6July2009©2009ANSYS,Inc.Allrightsreserved.Inventory#002666Workshop3-PreprocessingTrainingManual•DraganddroptheFixedSupportfromtheModalbranchtotheHarmonicResponsebranch.ANSYS,Inc.ProprietaryWS3-7July2009©2009ANSYS,Inc.Allrightsre
8、served.Inventory#002666Workshop3-EnvironmentTrainingManual•IntheHarmonicResponsebranch,applyoneforcetooneedge.
