Actran-XXXX用户大会_LG吸尘器噪声模拟

ActranUsers’Conference2012October3-4,2012-Brussels,BelgiumAero-AcousticsAnalysisinVacuumCleanerJongsooKim,KitakHyunLGElectronics/HomeApplianceLab.DaeyongKimActranUsers’Conference2012OutlineObjectandApproachActranModel-Full-MufflerpartTransferadmittanceUnitExcitation-Nozzleandonlypipe-Directivity-SamplePorousMaterialMufflerpartanalysis-TransferAdmittance-UsingMicrophoneMeasurementdata-ReciprocityAnalysisAero-Acoustics-WithCFDresultActranUsers’Conference2012(1)Aero-AcousticsofMotorPart(2)AeroAcousticsChamberAss`y(3)FluidFlowChamber(4)Sym/Un-symChamberAss`y(1)CycloneOptimization(2)OptimizeSeparationPipeCyclone(1)AeroAcousticsofMuffler2.Muffler&Nozzle(2)Muffleroptimize(3)AirJetnozzle(4)MufflerDrop&Impact1.Motor&Chamber3.Cyclone■Neckpoint-.ReduceNoiseLevelandmaintainSuctionPower-.StructuralVibrationAero-Acoustics,Tran.LossAcousticsinVCActranUsers’Conference2012Object&ApproachReducethenoiselevelwithmuffleronVC-60dB-53dBCalculationwithModalduct(Porous&Perforateduct)MaterialtuningCalculationwithCFDResultsActranUsers’Conference2012ACTRANModelDirectivityFieldPointVerticalMapFieldMeshExperimentalFieldPointPositionUpperSilencerLowerSilencerInfiniteElementPlaneWaveSourceActranUsers’Conference2012ACTRANModel#2PorousPart(air)PerforateinsideShellPerforateoutsideShellPorousSolidPart(orAIR)AirSolidPartMufflerpartmodelingstrategyforperforatedductandporous(orairdomain)ActranUsers’Conference2012MufflerModel(SectionView)surf1surf2OutsidesurfaceInsidesurfaceSectionViewSeparatethemeshwiththicknessofshellActranUsers’Conference2012TransferAdmittanceTablewithin-housecode(Mechelfunction)d2al()01161222pplRfaXfllπηρεπρε=+=+∆InhousecodeforgeneratingACTRANTablefileAdmittancePlot1122ppnppnAAvpAAvp−=−ActranUsers’Conference2012ModalDuctExcitation(checkLowerMuffler)ModalductregionActranUsers’Conference2012RadiationPowerComparewithLowerNozzleornotNozzlemufflerNozzlepartdon’thaveagoodperformancefornoisereductionoftotalsystemActranUsers’Conference2012WithandwithoutSamplePorousThisisnotrealperformanceofVC,It’sonlypatternAlso,theporousmaterialisACTRANsamplefileActranUsers’Conference2012TimedomainSourceActranUsers’Conference2012FocusonUpperpartMuffler(TL)MufflerholeCaseStudyTheexcitationofthiscaseisamodalductforcheckingofperformanceActranUsers’Conference2012ThankyouforACTRANinputdectInputdect:ChangethefilenameforAnothermechelfunctionMakeabatchfileforrunningthecasestudyduringthenightResearchercangohomeandchecktheresultsforallcaseonthenextmorningActranUsers’Conference2012CaseStudywithMechelFunctionmodalductexcitationPitch(PeakbiggerbutBandReduceHoleBiggerHolemovetoHighFrequency2:28.376(1)1:25.297(2)3:26.7404:29.2346:31.4887:31.492(4)9:40.8155:36.5498:34.836(3)ActranUsers’Conference2012CheckwithRSM•dB(A)RelationArea&ContactAreaRelationActranUsers’Conference2012ContactAreawithPorousPartActranUsers’Conference2012RadiationSourcewithmeasurementwithrealsourceCheckthesourcelevelwithsimplemeasurementonsimplepipeofVCRadiationLeveldB(A)ActranUsers’Conference2012ConvertSourceforInputReciprocitydB(A)-dB-AmplitudePressureconvert(input)Yellow:Measurement,Blue:CAEActranUsers’Conference2012CompareMeasurementandACTRANActranUsers’Conference2012ContourResultActranUsers’Conference2012ComparewithanotherdataActranUsers’Conference2012ContourResult1000Hz2000Hz3000Hz4000Hz5000HzNoPorousPorousActranUsers’Conference2012MaterialtuningWedon’tknowthematerialpropertyofporous(sponge)WehaverealsourceoninletwithreciprocityanalysisWecancomparewiththemeasurementandCAEresultintrialanderrorformaterial.Solvingtimeofthemufflercaseissofast,thenwecananalysisformaterialtuningjob.wecancheckthedifferenceofthechangedmaterialofmuffler.ActranUsers’Conference2012Initial9CaseAnalysis25(BLUE:NoPorous,RED:Porous)InsertionLoss(withPorous),Case3,Case4ismoregoodperformance.ActranUsers’Conference2012InsertionLoss26dBdB(A)AREACase137.3036.478.80Case237.9136.788.38Case350.7049.9414.72Case448.7947.7612.63Case530.1529.222.47Case641.2240.059.23Case742.2041.398.00Case830.0029.580.20Case935.1634.071.88영향도OveralldBNoPorousdB–PorousdBActranUsers’Conference2012ChangethediameterofmufflerforthelowerfrequencyeffectIfthemufflerdiameterischangedtobigger,thelowerfrequencyhaveagoodTLmorethansmallerActranUsers’Conference2012ChangeDiameter(TL)28D1D2ActranUsers’Conference2012Aero-AcousticswithCFDResultActranUsers’Conference2012(1)Aero-AcousticsofMotorPart(2)AeroAcousticsChamberAss`y(3)FluidFlowChamber(4)Sym/Un-symChamberAss`y(1)CycloneOptimization(2)OptimizeSeparationPipeCyclone(1)AeroAcousticsofMuffler2.Muffler&Nozzle(2)Muffleroptimize(3)AirJetnozzle(4)MufflerDrop&Impact1.Motor&Chamber3.Cyclone■Neckpoint-.ReduceNoiseLevelandmaintainSuctionPower-.StructuralVibrationAero-Acoustics,Tran.LossAero-AcousticsWithCFDresultActranUsers’Conference2012FarfieldforintakeFarfieldforouttake1.Fanblade2.Motorpart6.FlowExhaustToDefineCFD&AcousticsAnalysisofSuctionModule6Domainsand2Farfields4.Motorass`y5.Chamberass`y3.FilterCaseAss`y1.DefineofAnalysisModelFig1.AnalysisDomainTotalElements:9,68