【astm標準】e 1222 - 90 (2009)

1、Designation:E1222?90(Reapproved2009)StardTestMethodfLabatyMeasurementoftheionLossofPipeLaggingSystems1ThisstardisissuedunderthefixeddesignationE1222thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladopt

2、ioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodcoversthemeasurementoftheinse

3、rtionlossofpipelaggingsystemsunderlabatyconditions.1.2AprocedurefaccreditingalabatyfpurposesofthistestmethodisgiveninAnnexA1.1.3Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistherespons

4、ibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2C423TestMethodfSoundAbsptionSoundAbsptionCoefficientsbytheR

5、everberationRoomMethodC634TerminologyRelatingtoBuildingEnvironmentalAcousticsE90TestMethodfLabatyMeasurementofAirbneSoundTransmissionLossofBuildingPartitionsElementsE548GuidefGeneralCriteriaUsedfEvaluatingLaboratyCompete

6、nce(Withdrawn2002)32.2ANSIStards:S1.4SpecificationfSoundLevelMeters4S1.6PreferredFrequenciesBNumbersfAcousticalMeasurements4S1.11SpecificationfOctaveBFractionalOctaveBAnalogDigitalFilters43.Terminology3.1Definitions—Thea

7、cousticaltermsusedinthistestmethodareconsistentwithTerminologyC634.3.2DefinitionsofTermsSpecifictoThisStard:3.2.1pipelaggingsystem—anarrangementofnoiseinsulatingmaterialsusedtocoverapipetoreducenoiseradiatingfromit.4.Sum

8、maryofTestMethod4.1Noiseisproducedinsideasteelpipelocatedwithinareverberationroomusingblimitedwhitenoiseasatestsignal.Thenoisemustbeproducedbyaloudspeakeracousticdriverlocatedatoneendofthepipe.Averagesoundpressurelevelsa

9、remeasuredwithinthereverberationroomftwoconditionsonewithsoundradiatingfromthebarepipetheotherwiththesamepipecoveredwithalaggingsystem.Theionlossofthelaggingsystemisthedifferenceinthesoundpressurelevelsmeasuredwithsoundr

10、adiatingfromthebarelaggedpipewithanadjustmentfchangesinroomabsptionduetothepresenceofthelaggingsystem.Theresultsmaybeobtainedinaseriesof100Hzwidebsinonethirdoctavebsfrom500to5000Hz.Using100Hzwidebswillimprovethesignalton

11、oiseratiointhereverberantroom.Thisisfrequentlynecessarywhenmeasuringspecimenshavinghighionloss.5.SignificanceUse5.1Theionlossofapipelaggingsystemdependsuponthelaggingsystemmaterialsthemethodusedtoapplythematerialsthepipe

12、wallthicknessthesizeshapeofthebarelaggedpipethemechanismscausingnoiseradiationfromthepipe.ionlossesmeasuredusingthistestmethodshouldbeusedwithsomecaution.Inthelabatymeasurementsmustbemadeunderreproducibleconditionsbutinp

13、racticalusageinthefieldtheconditionsthatdeterminetheeffectiveionlossaredifficulttopredicttheymayleadtoslightlydifferentresults.ionlossesmeasuredwiththistestmethodcanbeusedsuccessfullyfacousticaldesignpurposes.ionlossesme

14、asuredwiththistestmethodaremostusefulfpipeslaggingsystemswhicharesimilartothoseusedinthelabatyconfiguration.1ThistestmethodisunderthejurisdictionofASTMCommitteeE33onBuildingEnvironmentalAcousticsisthedirectresponsibility

15、ofSubcommitteeE33.08onMechanicalElectricalSystemNoise.CurrenteditionapprovedApril12009.PublishedAugust2009.iginallyapprovedin1990.Lastpreviouseditionapprovedin2002asE1222–90(2002).DOI:10.1520E122290R09.2FreferencedASTMst

16、ardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3Thelastapprovedversionofthishisticalstardisreferencedonwww.astm.g.

17、4AvailablefromAmericanNationalStardsInstitute(ANSI)25W.43rdSt.4thFloNewYkNY10036:www.ansi.g..Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates18.TestSpecimen8.1Thetestspecimensh

18、allbeapipelaggingsysteminstalledonthebarepipefollowingnmalmountingprocedure.Thesystemshouldbelappedseamedfollowingaproceduresimilartotheoneusedinthefield.8.2Ifthepipelaggingsystemisusuallyinstalledwithaseamthetestspecime

19、nshallhaveatleastoneseamaroundthecircumferenceonelongitudinalseam.8.3Thetestspecimenshouldbesealedwhereitbuttstothewallsofthereverberationroomthecappedendofthepipe.Theflexiblemasticusedtosealgapsaroundthepipeisalsorecomm

20、endedfthispurpose.Themasticshouldnothardenwithagesoastocauseflanking.9.TestSignal9.1Theloudspeakershallbedrivenwithbsofwhitenoise.Toavoidnonlinearitiesthetotalsoundpressurelevelshallnotexceed160dBinsidethepipe.9.2Thesoun

21、dpressurelevelinthetestbontheinteriofthepipeshallhaveamaximumshttermtimevariationinanybnogreaterthan2dBmeasuredwiththe“slow”dynamicacteristicofasoundlevelmetertheequivalent.Ifnecessarylongertimeaveragesmaybeused.9.3TestF

22、requencyBs:9.3.1ConstantBwidthMethod—Thetestsignalshallbecontiguous100Hz(610Hz)widebsofwhitenoisewitharithmeticcenterfrequenciesoverthenominalrangefrom500to5000Hz.Optionallybscenteredat300400Hzmayalsobeused.9.3.2Onethird

23、OctavebMethod—Thetestsignalshallbecontiguousonethirdoctavebsofwhitenoiseatthepreferredonethirdoctavebcenterfrequenciesfrom500to5000Hz.Optionallyonethirdoctavebsfrom315to5000Hzmaybeused.10.MeasuringInstruments10.1Theminim

24、uminstrumentationrequiredfthistestmethodisasfollows:10.1.1Amonitingmicrophonelocatedinsidethetestpipe10.1.2Onemeroommeasurementmicrophoneslocatedinthereverberationroom10.1.3Microphoneamplifiersthatsatisfytherequirementso

25、fANSIS1.4fType1bettersoundlevelmeterswiththeexceptionthatABweightingwksarenotrequired10.1.4Alevelmetergraphiclevelrecderotherdevicefromwhichthesoundpressurelevelcanbereadrecded.Theaveragingtimeoftheinstrumentsshallbesuff

26、icienttopermitthedeterminationoftheaveragesoundpressurelevelwithadequateprecision.10.2Measuringfiltersarerequireddependuponthemethoded:10.2.1ConstantBwidthMethod—Nominal100Hzwideconstantbwidthfilterswitharithmeticcenterf

27、requenciesconsistentwiththetestsignalfrequencyrange.10.2.2OnethirdOctaveBMethod—AonethirdoctavefiltersetsatisfyingtherequirementsofANSIS1.11fder3higherType1better.Thenominalcenterfrequenciesofthefiltersshallbethesameasth

28、etestsignalcenterfrequency.10.3Anarrowbanalyzerisoptional.Itmaybeusefulfmonitingspectralunifmityofthesoundwithinthepipe.11.Procedure11.1Installthelaggingspecimenonthepipe.11.2microphonepositionswithinthereverberationroom

29、.Thelocationsshallbeatleastonehalfwavelengthawayfromanysolidsurfaceatthelowesttestfrequency.11.3Usingthereferencesoundsourcemeasuretheaveragesoundpressurelevelsineachtestbwithinthereverberationroom.Turnoffthereferencesou

30、ndsource.11.4Drivetheloudspeakerattheendofthepipewiththetestsignalmeasuretheaveragesoundpressurelevelsineachtestbwithinthereverberationroom.Measurethesoundpressurelevelsgeneratedbythetestsignalatthemonitingmicrophoneinsi

31、dethepipe.11.5Removethetestspecimenfromthepipewhilemaintainingtheentireequipmentsetupincludingallsourcemeasuringinstrumentsettingsasfaraspractical.Aprecisionstepattenuatmaybeusedtotemparilylowerthetestsignaldrivingthelou

32、dspeakerwhileremovingthetestspecimen.Itisoftheutmostimptancetomakenochangesintheloudspeakerposition.11.6Returnthetestsignaltotheprevioussetting.11.7Comparethesoundpressurelevelsgeneratedbythetestsignalatthemonitingmicrop

33、honewiththespectrummeasuredin11.4.Ifthetestsignalwithsufficienttimeaveragingdiffersbymethan2dBinanytestbfromthatmeasuredin11.4withthetestspecimeninplacebegintheprocedureagain.11.8Measuretheaveragesoundpressurelevelsineac

34、htestbwithinthereverberationroom.Turnthetestsignaloff.11.9Repeatstep11.3fthebarepipe.11.10Ifanotherspecimenistobetestedrepeatallstepsoutlinedin11.111.9.12.Calculation12.1Ineachtestfrequencybcalculatetheionlossofthetestsp

35、ecimenasfollows:IL5Lb2Ll2@Lbr2Llr#(1)where:IL=ionlossdBLbLl=averagesoundpressurelevelmeasuredwithsoundradiatingfromthebarepipelaggedpiperespectivelydBLbrLlr=averagesoundpressurelevelmeasuredwiththereferencesoundsourcewit