ASTM E477-2006a 测定导管衬里材料和预制消音器的声及气流特性的标准试验方法

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【英文标准名称】:StandardTestMethodforMeasuringAcousticalandAirflowPerformanceofDuctLinerMaterialsandPrefabricatedSilencers
【原文标准名称】:测定导管衬里材料和预制消音器的声及气流特性的标准试验方法
【标准号】:ASTME477-2006a
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:E33.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:声学;空气流动;建筑声学;建筑;材料;管道;消声器;试验
【英文主题词】:airflowgeneratednoise;airflowperformance;ductlinermaterials;insertionloss;prefabricatedelbowsilencers;prefabricatedstraightsilencers
【摘要】:Specimenstestedusingthisstandard,forexample,ductsilencers,areusedtocontrolsoundpropagationthroughventilationducts.Theresultsgatheredfromtestingspecimenstothisstandardcanbeusedtoestimatethereductioninfansoundlevelsinductedairflowsystemscausedbyincludingasoundattenuatingdeviceinthesystem.Thedevicecanbeacomponentinasource-path-receiveranalysiswherecalculationsareperformedtodeterminetheresultantsoundlevelinanoccupiedspace.Properselectionofasoundattenuatingdevicecanenableadesignertoachievein-spacebackgroundnoisecriteria.Theinsertionlossofasilencerisamatterofdegree,andvarieswithfrequencyandwiththedirectionandspeedofairflow.Becausesilencerspartiallyobstructtheairpathandprovideresistancetoairflow,twoothereffectsmustbequantified:pressuredropandairflow-generatednoise.Bothincreasewithincreasingairspeeds;thusdataarerequiredforseveralairflowstocorrectlycharacterizeperformance.Theaerodynamicresultsfromtestingspecimenstothestandardcanbeusedasinformationforthesystemdesignengineertodeterminetheamountofstaticpressuredropresistancetobeovercomebythesystemfan(s).Guidelinesforappropriatemaximumallowablepressuredropforasoundattenuatingelementhavebeenestablishedinthedesigncommunityandarebasedontheproceduresdescribedherein.Asstatedpreviouslyin1.5ofthistestmethod,theactualperformanceofasoundattenuatingdeviceasinstalledinanairductsystemmaybesignificantlydifferentthanreportedbasedonthetestprocedureherein.Thisstandarddoesnotprovideguidancetotheuseronthesesystemeffects.Silencersareoftendesignedtobeusedunderconditionswhichdonotduplicatethetestset-upsofthisstandard.Mock-upsandspecializedtestset-upstodetermineperformanceofsoundattenuatingdevicesinnon-standardconfigurationsmaybebasedonthistestmethodbutcannotbeconsideredtobeinfullconformancewiththistestmethod.SeeAnnexA2forfurtherinformationregardingsuchtests.1.1Thistestmethodcoversthelaboratorytestingofsomeoftheacousticalpropertiesofsoundattenuatingdevicesincludingductlinermaterials,integralducts,andin-ductabsorptivestraightandelbowsilencersusedintheventilationsystemsofbuildings.Proceduresaredescribedforthemeasurementofacousticalinsertionloss,airflowgeneratednoise,andpressuredropasafunctionofairflow.1.2Excludedfromthescopearereactivemufflersandthosedesignedforusesotherthaninventilationsystems,suchasautomobilemufflers.1.3Thistestmethodincludesaprovisionforasimulatedsemi-reflectiveplenumtofitaroundthin-walledductandsilencertestspecimens,sincetheacousticalenvironmentsaroundsuchthin-walledspecimenscanaffectthemeasuredinsertionloss.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.4Thismethodteststheperformanceofthespecimeninwell-definedandcontrolledconditions.Ifthespecimenisinstalledinthefieldinanydifferentmanner,theresultsmaybedifferent.Thisstandarddoesnotprovideestimatingproceduresfordeterminingtheactualinstalledperformanceofthespecimenfieldconditions.
【中国标准分类号】:P31
【国际标准分类号】:91_120_20
【页数】:11P.;A4
【正文语种】: