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1、WORLDWIDETestProcedureENGINEERINGGMW14177NoiseandVibrationSTANDARDSRandomIncidenceSoundAbsorptionEvaluationTestProcedureavailable,anAlphaCabinshallbeused,perGM1Scopeapproval.SeeAppendixAforAlphaCabinproceduredeviations.AbsorptioncoefficientshallbemeasuredbasedonISO354(StandardTestMe
2、thodforSound3.2Equipment.WhollycontainedinISO354.AbsorptioninaReverberationRoom).This3.3TestVehicle/TestPiece.standardshallbereferencedformoredetailed3.3.1FlatStockMaterial.Atleast6.7m2offlatinformationcorrespondingtothefollowingstockmaterialshallbemeasured.Ifthecomponentprocedure.W
3、ithGMapproval,RIETERAlphahasmultiplethicknesses,typicallythreeCabinmeasurementsshallbeacceptedwiththeupthicknessesareevaluated;onefullloft,onefulltodatecalibrationandmaintenancedocumentationcompression,andone50%offullcompressionforprovided.transitionareas.Note:Nothinginthespecificat
4、ionsupersedesIfthematerialwhenusedinthevehiclehasanairapplicablelawsandregulationsunlessspecificgapbehindit,thisspaceshallbecomprehendedexemptionhasbeenobtained.asfollows:testonesamplewithnoairgapandatNote:IntheeventofconflictbetweentheEnglishleast3sampleswithrespectiveairgapstospan
5、anddomesticlanguage,theEnglishlanguageshallavailablepackaging.(Ifprogrampackagingistakeprecedence.unknown,defaultairgapsshallbe5,10,15,and1.1Purpose.Todeterminetherandomincidence20mm).soundabsorptionofacousticcomponents.Iftherooftrimhasabsorptionmaterialplaced1.2Foreword.Thistestpro
6、cedureisusedinthebetweentherooftrimandsheetmetal,testthedevelopmentandvalidationofcomponentsandsamplewithandwithoutthematerial.subsystems.3.3.2Buck.Edgesshallbetreatedasinvehicleto1.3Applicability.Thistestisapplicabletoalleliminateanyedge/flanking/non-representativecomponentswhichar
7、ereliedontoprovidesoundairgapspacingeffectsofthemoldedpart.absorption,i.e.seats,floortrim,rooftrim,rearHolesshallbesealedwithnoisecontrolpatchingwindowtrimpanels,luggagetrim,enginematerial.absorption,andanyothermaterialaddedtotheAtleast6.7m2ofmaterialshallbemeasured.Thisvehicleforso
8、undabsorptionpurpos
