virtual.lab声固耦合的隔声量仿真分析教程

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1、FEMDirectVibro-AcousticAnalysisCaseTutorialObjective:Thegoalofthistutorialistocalculatetheacousticresponseofaglass/PVBplate(alaminatedsafetyglasswithaPolyvinylbutyrallayerinbetween).Thetutorialincludesusingthefollowinganalysiscases:·StructuralModalcase·

2、DirectStructuralForcedResponse·DirectStructuralVibro-AcousticResponse·TransmissionLossThe modelcontainsaVisco-elasticfrequency-dependentmaterial.Pre-Requisites:SoftwareConfigurationsthatareneededtorunthetutorial:·LicensestosetupthecaseinLMSVirtual.Lab:"

3、Desktop(VL-HEV.21.1orequivalent)"and"FiniteElementAcoustics(VL-VAM.36.2)"·Whensolvingtheacousticresponsecase,thelicenseforproduct"LMSVirtual.LabFEMVibro-AcousticsStructuralSolverVL-VAM.45.2"isneeded.·SolvingtheRandomPost-processingcasetogettheTransmissi

4、onLosscurvewillrequirethelicensefor"RandomVibroAcousticAnalysis(VL-NVP.20.3)" TutorialDataFiles:StructuralGroups.xmlSAFyoung.xlsLaminatedStructure.bdfFPmesh.bdfAMLsender.bdfAMLreceiver.bdfAcousticGroups.xml[AlldatafilescanbefoundontheAPPSnDOCSDVD,inanar

5、chivecalled VAM_DirectVA-TL.Foreaseofuse,itisbesttocopyallfilestoalocalfolder.]STEPBYSTEPTutorial:STEP1AfterstartingLMSVirtual.Lab,createanewdocumentintheAcousticHarmonicFEMWorkbench(StartAcousticsAcousticHarmonicFEM).STEP224SelectFileImportfromthemainm

6、enu.[TheImportcommandcanalsobeselectedfromthecontextualmenuoftheLinksManager,byrightclicking]Afileselectorwindowappearsallowingyoutospecifythefiletypeandthefilename.[Formoredetails,seeImportingData]SelectthefiletypeNASTRANBulkFile(*.bdf,*.NS,*.nas,*.dat

7、)andbrowseforthefileLaminatedStructure.bdfandclicktheOpenbutton.Anewdialogboxappearsrequestingtheselectionofdatathatneedstobeimportedfromthefile.Thedataentriesthatarenotavailableinthefilearegrayedout.SelectinSplitintoMultipleMeshPartsunderMeshCreationan

8、dsettheunitsystemtoMeter,Kilogram,Second,clicktheOKbutton.STEP3Next,thedifferentstructuralmaterialswillbedefined.ThetwoouterlayersofthepanelaremadeofGlass.Toincorporatethe2%structuraldampingofthismaterial,itwillbemodeled24asavisc