Acoustic-Analysis-in-Abaqus声学仿真

AcousticAnalysisinAbaqus2011Febweb-trainingSimutechSolutionCorporationWebinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceAgendaStructuralAcousticApplicationsAcousticProblemTypesPossiblewithAbaqusAcoustic名詞解釋Acousticanalysis的準備事項AcousticAnalysis建模指引ExamplesAcousticAnalysisinAbaqus2Webinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceEnginenoiseStructuralAcousticApplicationsHumanperceptionandcomfortArchitecturalacousticsDesignandanalysisofelectro-acousticsystemsUnderwaterapplicationsVibrationsofstructuresinteractingwithfluidsCourtesy: Honeywell FM&TPiezoelectricUnderwaterTirenoiseWebinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceAcousticProblemTypesPossiblewithAbaqusAbaqusaimstocoverapplicationsthatcanbeanalyzedwellwithapressure-basedfiniteelementformulation.Webinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceAcousticProblemTypesPossiblewithAbaqusUncoupledacousticsproblems(pureacousticsproblems)Interiorsoundproblems(automobiles,airplanes,rooms)Exteriorsoundpropagationproblems(radiationfrommachinery,engines)Coupledstructural-acousticsproblemsForcedexcitation(loudspeakers)Fluid-loadedsteady-statevibration(vibratingplates,shells)Acousticwavesimpingingonstructures(submarines)Webinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceAcousticProblemTypesPossiblewithAbaqusCoupledproblemclassifications:“light”and“heavy”fluids“Light”fluidssuchasairusuallyexertonlyrelativelysmallacousticpressuresonthestructure.“Heavy”fluidssuchaswatermayexertlargeacousticpressuresonthestructure.Thisdistinctiondependsonthemassandstiffnessofthefluidrelativetothemassandstiffnessofthestructure.Acoustic名詞解釋Webinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceAcousticsTerminologyWhatisimpedance(physically)?TransmissionlossofabodyduetosurfaceeffectsImpedanceTheacousticimpedance,Zn,isdefinedastheratioofacousticpressuretotheassociatedparticlespeedinacertaindirection:whereisthefluidparticlevelocityvectorandisaunitvectorintheparticulardirection.nfpZvnfvnWebinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceAcousticsTerminologyVolumetricdragThemediumsupportingacousticwavesmaybeflowingthroughaporousmatrix.Examples:fiberglassusedforsounddeadening,ultrasonicsoundinthehumanbodySuchflowresistanceeffectsarecommonlycharacterizedinthefrequencydomainbyacomplex,frequency-dependent:DensityImpedanceorPropagationconstantVolumetricdrag(r)isrelatedtomaterialimpedance(Zmat)bythefollowingrelationship:Theimaginarypartaffectsthepressureamplitude.Therealpartaffectsthewavelength.2ReImmatmatfZZrKWebinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceAcousticsTerminologyVolumetricAccelerationAcousticloadduetoacousticparticlemotionExampleofVolumetricAccelerationAhorizontal,flatrigidplateoscillatingverticallyimposesanaccelerationontheacousticfluid.Anacousticloadisequaltothisaccelerationtimesthesurfaceareaoftheplate.Theloadistheaccelerationofafluidparticleifthevolumetricdrag(r)iszero.fluidvibrating platefluiduplateu0:0:fluidplatefluidplateruuruuififAcousticanalysis的準備事項Webinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceGeneralCapabilitiesAcousticelementStructural-acousticinterfacecouplingelementsAcousticinfiniteelementsTetrahedral element model with one‐eighth symmetryWebinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceGeneralCapabilitiesBoundaryconditionsNonreflectingboundaryconditionsforthefollowingdomains,withorwithoutvolumetricdrageffectsAcousticDomainElliptical boundary conditionWebinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceGeneralCapabilitiesSolutionproceduresDirectsolutionmethodsTransientdynamicanalysis(Abaqus/StandardandAbaqus/Explicit)Steady-statedynamicanalysis(Abaqus/Standardonly)Modalsolutionmethods(Abaqus/Standardonly)Eigenfrequencyextraction–BothuncoupledandfullycoupledmodeextractionModaldynamicanalysisWebinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceGeneralCapabilitiesAcousticmediumandsurfacepropertiesMaterialpropertiesmaybedependentontemperature,and/oronuser-definedfieldvariables.AirandothergasesWaterandotherliquidsSolidmedia,if:–Shearisunimportantcomparedtodilatationalstresses.–Example:somesoilsorrubberstructures,especiallyinsmall-vibrationanalysis.Multipleacousticmaterialscanbeused.AcousticmediumpropertiescanincludevolumetricdragImpedanceconditionscanbedefinedonboundariesofacousticfluids.Webinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceGeneralCapabilitiesAcoustic-structuralinteractionsUseTIEconstraintsforcoupling.Webinar Title –Month Year –See ViewSlide Master to changeImprovingAcousticPerformanceGeneralCapabilitiesTypicaldesiredoutputPressuremagnitudePressuredBmagnitudesOutputavailableinAbaqu