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WS1a-1WORKSHOP1ANORMALMODESANALYSISNAS122,Workshop1a,January2004Copyright?2004MSC.SoftwareCorporation
NORMALMODESANALYSISProblemDescriptionForthisproblem,weusetheLanczosmethodtofindthefirsttennaturalfrequenciesandmodeshapesofaflatrectangularplate.Belowisafiniteelementrepresentationoftherectangularplate.Italsocontainsthegeometricdimensionsandtheloadsandboundaryconstraints.Table1containsthenecessaryparameterstoconstructtheinputfile(seenextpage).
NORMALMODESANALYSISProblemDescription(cont.)Table1
NORMALMODESANALYSISSuggestedExerciseStepsCreateageometrysurfaceusingthegivendimensions.MeshthesurfacewithQuadelementsusingGlobalEdgeLengthof0.5.Assigntheboundaryconditionstothemodel.Createtheappropriatematerialpropertiesandcallitmat_1.Assigntheappropriateelementpropertiestothemodelandcallitprop_1.SubmitthemodeltoMSC.Nastranforanalysis.Attachthe.XDBresultsfile.PostProcessresults–createaquickplotforeachofthe10modeshapes.
CREATENEWDATABASECreateanewdatabasecalledws1.db.File/New.Enterws1asthefilename.ClickOK.ChooseDefaultTolerance.SelectMSC.NastranastheAnalysisCode.SelectStructuralastheAnalysisType.ClickOK. abcdefg
Step1.Geometry:Create/Surface/XYZCreatea5x2surface.Geometry:Create/Surface/XYZ.Enter520astheVectorCoordinatesList.TurnoffAutoExecute.ClickApply. adcb
Step2.Elements:Create/Mesh/SurfaceCreatethefiniteelementsonthesurface.Elements:Create/Mesh/Surface.SelectQuadforElemShapeandIsoMeshforMesher.ScreenpickSurface1fortheSurfaceList.UnchecktheAutomaticCalculationoption.ChangetheGlobalEdgeLengthvalueto0.5.ClickApply.abcdef
Step3.Loads/BCs:Create/Displacement/NodalAssigntheboundaryconstraintstothefiniteelementmodel.Loads/BCs:Create/Displacement/NodalEnterconstraintfortheNewSetName.ClickInputData
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