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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.inesatestmethodforquantifyingtheperformanceoffreesoundfie1.denvironmentsfo】MBmiberpurposespermwtiwiasKiErwneNtsayirifcMiHHddUuhyGHMdhhfdfcbUKtdes.pmftftsrt即11R)11mcft(t1.sotihNvH11h4i1.fe,dw11bcrgencra1.f1.oor).dcscriptionofthesourceposition(三)withinthetestD.3.2MiCroPhonetraverse
