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1、Workshop9.1FreeVibrationAnalysis15.0ReleaseIntroductiontoANSYSMechanical1©2014ANSYS,Inc.February12,2014Release15.0GoalsOurgoalistoinvestigatethevibrationcharacteristicsofthemachineframeshownhere.Wewanttosolve2modalanalysesusingdifferentmountingpointsonthef
2、rame.2©2014ANSYS,Inc.February12,2014Release15.0AssumptionsTheframecontains8,20mmdiametermountingholes.Inthefirstanalysistheframewillbeconstrainedbyall8holes.Inthesecondanalysiswe’llonlyconstrainthecornerholes.Tosimplifythesetupwe’llcreateseveralnamedselect
3、ions.3©2014ANSYS,Inc.February12,2014Release15.0ProjectSchematic1.FromtheToolboxdoubleclick“Modal”tocreateanewsystem.1.2.RMBthe“Geometry”cellandbrowseto“Machine_Frame.stp”.3.Doubleclick“Model”toopentheMechanicalapplication.2.3.4©2014ANSYS,Inc.February12,201
4、4Release15.0Setup4.SettheworkingUnitSystem:•Units>Metric(mm,kg,N,s,mV,mA)4.5©2014ANSYS,Inc.February12,2014Release15.0CreateNamedSelections5.CreatethefirstNamedSelection:a.HighlighttheModelbranch,RMB>Insert>NamedSelection.5a.b.IntheNamedSelectiondetailschan
5、gethescopingmethodto“Worksheet”.5b.6©2014ANSYS,Inc.February12,2014Release15.0CreateNamedSelections6.CreatethefirstNamedSelection:a.IntheWorksheet,RMB>AddRow.b.Picktheaction“Add”andconfigureasshown6a.below.c.Generate.6d.d.Renameto“EightHoles”.6c.6b.Knowingt
6、heholesare20mmdiameterweusethe“radius”criteriatocreateanamedselectioncontainingallofthemountingholes.7©2014ANSYS,Inc.February12,2014Release15.0CreateNamedSelections7.CreateasecondNamedSelection:a.Highlightthenamedselection“EightHoles”,RMB>Duplicate.b.Renam
7、ethenewnamedselection“FourHoles”.7a.c.Inthedetailsverifythescopingmethodisstillsetto“Worksheet”.7b.7c.8©2014ANSYS,Inc.February12,2014Release15.0CreateNamedSelections8.CreateasecondNamedSelection:a.RMBand“AddRow”.b.Picktheaction“Remove”andconfigureasshownbe
8、low.8a.c.Generate.8c.8b.Usingthe“remove”operationandarangeintheXdirectionwehaveeliminatedtheinteriorholesfromthenamedselection.9©2014ANSYS,Inc.February12,2014Release15.0Environment9.Applysupportstomodel(highl
