ASTM E2611-2009 基于传输矩阵法测量声学材料的垂直入射传输的标准试验方法

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【英文标准名称】:StandardTestMethodforMeasurementofNormalIncidenceSoundTransmissionofAcousticalMaterialsBasedontheTransferMatrixMethod
【原文标准名称】:基于传输矩阵法测量声学材料的垂直入射传输的标准试验方法
【标准号】:ASTME2611-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E33.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:4-microphone;impedancetube;normalincidence;transferfunction;transfermatrix;transmissionloss
【摘要】:Thereareseveralpurposesofthistest:Fortransmissionloss:(a)tocharacterizethesoundinsulationcharacteristicsofmaterialsinalessexpensiveandlesstimeconsumingapproachthanTestMethodE90andISO140-3(x201C;reverberantroommethodsx201D;),(b)toallowsmallsamplestestedwhenlargersamplesareimpossibletoconstructortotransport,(c)toallowarapidtechniquethatdoesnotrequireanexperiencedprofessionaltorun.Fortransfermatrix:(a)todetermineadditionalacousticpropertiesofthematerial;(b)toallowcalculationofacousticpropertiesofbuilt-uporcompositematerialsbythecombinationoftheirindividualtransfermatrices.Therearesignificantdifferencesbetweenthismethodandthatofthemoretraditionalreverberantroommethod.Specifically,inthisapproachthesoundimpingesonthespecimeninaperpendiculardirection(x201C;normalincidencex201D;)only,comparedtotherandomincidenceoftraditionalmethods.Additionally,revererationroommethodsspecifycertainminimumsizesfortestspecimenswhichmaynotbepracticalforallmaterials.Atpresentthecorrelation,ifany,betweenthetwomethodsisnotknown.Eventhoughthismethodmaynotreplicatethereverberantroommethodsformeasuringthetransmissionlossofmaterials,itcanprovidecomparisondataforsmallspecimens,somethingthatcannotbedoneinthereverberantroommethod.Normalincidencetransmissionlossmayalsobeusefulincertainsituationswherethematerialisplacedwithinasmallacousticalcavityclosetoasoundsource,forexample,aclosely-fittedmachineenclosureorportableelectronicdevice.Transmissionlossisnotonlyapropertyofamaterial,butisalsostronglydependentonboundaryconditionsinherentinthemethodanddetailsofthewaythematerialismounted.Thismustbeconsideredintheinterpretationoftheresultsobtainedbythistestmethod.Thequantitiesaremeasuredasafunctionoffrequencywitharesolutiondeterminedbythesamplingrate,transformsize,andotherparametersofadigitalfrequencyanalysissystem.Theusablefrequencyrangedependsonthediameterofthetubeandthespacingbetweenthemicrophonepositions.Anextendedfrequencyrangemaybeobtainedbyusingtubeswithvariousdiametersandmicrophonespacings.Theapplicationofmaterialsintoacousticalsystemelementswillprobablynotbesimilartothistestmethodandthereforeresultsobtainedbythismethodmaynotcorrelatewithperformancein-situ.1.1Thistestmethodcoverstheuseofatube,fourmicrophones,andadigitalfrequencyanalysissystemforthemeasurementofnormalincidenttransmissionlossandotherimportantacousticpropertiesofmaterialsbydeterminationoftheacoustictransfermatrix.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A59
【国际标准分类号】:17_140_01
【页数】:14P.;A4
【正文语种】:英语