1、INTERNATIONA1.STANDARDISO26101-1editionFiret2021-05AcousticsTestmethodsforthequa1.ificationoftheacousticenvironment一建胴IiqCatiOnoffree-fie1.denvironmentsAcousUqueMethodesdessaipour1.aqua1.ificationdeVenvironnementacoustiquePartie1:Qua1.ificationdesenfironnementsenchampIihreReferencenumberISO26101-1.:
2、2021(E)COPYRIGHTPROTECTEDDOCUMENTISO2021岫rkdea/山thUcdOthcnviscjftc三orrtmcehDVBiwixuioiti08phnn11UatiocBhrhotocp)Mng,ptbcatonpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanherequestedfromeitherISOattheaddressbe1.owOr1.sOXSmemberbodyinthecountryoftherequester.%,tft晒Iandonn
3、et8CH-1214*crnicr,GenevaPhone：M1.22749O1.11帆禅igjWft.orgPub1.ishedinSwitzerhndISO2021-A1.1.rightsreservedIntroductionenvironmentprovideasoundsoundiffie1.dOrboundingsoundsurfacesoverref1.ectingsoundp1.ane.energiesacoustica1.inaconfinedspacewithinthefaci1.ity.Internationa1.Standardsqua1.ificationproced
4、uresout1.inedincases,documentdocumentsreferedtoreference1-A1.1.11ghtsreservedThisdocumentdescribesthedivergence1.ossmethodofmeasurementofperformanceofanenvironmentdesignedisafreefreefie1.dithasfreefie1.dthatabsorba1.1.Anincidentuponthem.Thisisnorma1.1.yachievedusingspecia1.izedtestenvironments,sucha
5、sanechoicorhemi-anechoicchambers.Inpractice,theseprovideacontro1.1.edfreesoundfie1.dforacoustica1.measurementsThepurposeofthisdocumentistopromoteuniformityinthemethodandconditionsofmeasurementwhenqua1.ifyingfreesoundfie1.denvironments.isexpectedthattheandindustrytestcodes.Insuchthisthesevri1.1.bemak
6、ingbyothertothisdocumentmayspecifyqua1.ificationcriteriaappropriateforthetestmethodandmayrequirespecifictraversepaths.isaninput5wapparatus;quantitytoa1.1.owforanyuncertaintyduetoref1.ectionsfromthemeasuring611hodisaninputquantitytoa1.1.owforanyuncertaintyduetotheapp1.iedmeasurementmethod：&ncnisaninp
7、utquantitytoa1.1.owforanyuncertaintyduetothecorrectionforabsorptionofsoundbytheatmosphere；6resdisaninputquantitytoa1.1.owforanyunaccountedforresidua1.uncertainties.睥Tfccthci1.rtofqknotddgcind1.thttidmkwh三MH1.)ddUnwibVib三Dptaip1.11tathuthUghtoctecarchcou1.drevea1.thatthereareothers.N端向es桶柞解楸a1.ionp斌蚪
8、百蒯曲脚曲片沙猴而百耙四糖相加1.1.Of瞄IetWeeHP11加加眼SWeensomeoftheinputquantities.A帆福幅t假砥栩肛儡V曲网叫慨郎,bestSt融福iet咨设1.1.ea题猴熄Mth就t/曲HtfM)Utitsstandarddeviationisameasureofthedispersionofva1.ues.Theuncertaintyintheestimateoftheinputquantityistermedthestandarduncertainty.Itisafunctionofthestandarddeviation,probabi1.ityC.3
9、distributionandnumberofdegreesoffreedom.ContributionstomeasurementuncertaintyThesensitivitycoefficientsareameasureofhowtheva1.uesofthedeviationsareaffectedbychangesintheva1.uesoftherespectiveinputquauUe7-MaU4Hnatica1.1.y.theseCoefTicientsareequa1.tothepartia1.除帼8版Het他限BB部曲即融阳腑旗她峙t暗魄H似hfcer3e喙晒槽跳SqUa
10、ntiT般PrOdUetSofthestandarduncertaintiesandtheirassociatesensitivitycoefficients.Forthecaseofneg1.igib1.ecorre1.ationbetweentheinputquantities,thecombinedstandarduncertaintyofthedeterminationofthe忡iat毗如5inversesquare1.aw,w(Ap,)1.isgivenbyPormu1.a(C2):(C2)丽IateStIft(曲阳YiwMaintiesiiiformaHWee峋恤j愉啊Hr叫泪屋
11、柚hftyestaBimi!1.eregArch.AnTheexpandeduncertaintyistypica1.1.ytwicethecombinedstandarduncertain1.yforacoverageprobabi1.ityof95%andassuminganorma1.distribution.AnnexD(informative)Guide1.inesforreferringtothistestmethodD.1.Genera1.Thisdocumentout1.inesatestmethodforquantifyingtheperformanceoffreesound
12、fie1.denvironmentsfo】MBmiberpurposespermwtiwiasKiErwneNtsayirifcMiHHddUuhyGHMdhhfdfcbUKtdes.pmftftsrt即11R)11mcft(t1.sotihNvH11h4i1.fe,t,Ga1.i,j!f12Jvrt)h-anechoicroomforthemeasurementofnoiseemittedbycomputerandbusinessequipment.NoiseNewsInternationa1.1993pp.11-2131 1.uykxM.P.M.,VercammenM.1.S.,Ref1.
13、ectionsinanechoicrooms.Proc.Inter-Noise,2001,pp.2187-9132MnBaft6drufe:WiSBr1.bNv反曲M的班QQaMkatione65-69Ohemi-anechoicroomsfornoiseemission33 Ma1.ingG.C.Jr.,WiseRE,Nobi1.eM.A.Draw-awaytestingforqua1.ificationofhemi-anechoicrooms.In：Proc.Noise-Con90,1990,pp.363-36834 Meche1.F.P.,ZurAnforderunganAbsorber
14、fiirref1.exionsarmeMessraume.WkSb41.1998,pp.20-2835 SdiUsAmRp蝇破46hpai02n,fPartn1.ysound1.aboratoryandanechoicchamber.J.Acoust.36 Mi1.zH.-J.,SchubertR.,ZurGtiteprufungvonakustischenFreife1.draumennachDIN45635Tei1.1bzw.ISO3745.Zeitschriftfiir1.armbekampfung.1999,46(1.)pp.7-1437 More1.andJ.B.,Performan
15、ceofhemi-anechoicroomsforindustria1.app1.ications.NoiseContro1.Eng.J.1989,32(1)pp.7-1438 pJ1s06HP2Acoustic1.aboratoryinthenewRCA1.aboratories.J.Acoust.Soc.Am.1943,15(2)39 Pancho1.yM.ChapgarA.F.,MohananV.,DesignandconstructionofananechoicchamberatTheNationa1.Physica1.1.aboratoryof1.ndia.App1.Acoust.1
16、981,14pp.101-11140Rip&pPN2S11268anechoicchamberforacoustica1.measurements.SovietPhysica1.Acoustics.1962,41 S1.eeperH.P.,Jr.,MootsE.E.,Beranek1.1.TheHarvardanechoicchamber.CIR51,E1.ectro-Acoustic1.aboratory.HarvardUniversity,194542 TomiokaH.,FujimoriT.,TakahashiT.,MiuraH.Inversesquare1.awversusaccuraciesofacousticpower1.eve1.inananechoicroom.In：ProcNoiseCommittee,Acoustica1.SocietyofJapan,N86-04-3,1986
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