ISO 13472-2 2025.docx

ISOInternationalStandardISO13472-2Secondedition2025-05AcousticsMeasurementofsoundabsorptionpropertiesofroadsurfacesinsitu一Part2:SpotmethodforreflectivesurfacesAcoustiqueMesurageinsitudesproprietesd,absorptionacoustiquedesrevetementsdechausseesPartie2:MethodeponctuellepourIessurfacesreflechissantesReferencenumberISO13472-2:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordivIntroductionv2 Normativereferences13 Termsanddefinitions11.1 'Measurementprinciple31.2 Signalanalysis41.3 Insitufixture45 Testequipment55.1 Soundsource55.2 Testsignal55.3 ImPedanCetube55.3.1 Tubediameter55.3.2 Tubelengthandmicrophonepositions55.3.3 Microphones65.4 Insitutestfixturebetweenimpedancetubeandtestsurface65.5 Signalprocessingsystem75.6 Thermc)meterandbarometer76 Measurementandanalysisrequirements76.1 StabiliZirlgthesystem76.2 CalibratiOnofthesystem.76.3 Referencemeasurement76.4 Measurementofaroadsurface76.6 One-thirdOCtaVebandabsorptionspectrum.97 Positioningoftheequipment97.1 Locationofthemeasurementpositions97.1.1 TestsurfacessuchasthosemeetingISO10844requirements97.1.2 Regularroads97.2 Temperature98 Measurementandanalysisprocedure99 MeaSUremelltUIICertaiIItyrequirements1010 Testreport11Annex A (informative)Correctiononbaseofreferencemeasurement13Annex B (informative)Measurementuncertainty14Annex C (informative)Alternativeprocedurestoimproveaccuracy17Annex D (informative)Insitutestfixture20ArlrIeXE(informative)EXaITlPleofatestreport22Bibliography.25ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)whichmayberequiredtoimplementthisdocument.However,Implementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatWWW.iso.org/patents.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISO'sadherencetotheWorldTradeOrganization(WTO)principlesintheTechnicalBarrierstoTrade(TBT),seeWWW.iso.org/iso/foreword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC43,Acoustics,SubcommitteeSC1,Noise.Thissecondeditioncancelsandreplacesthefirstedition(ISO13472-2:2010),whichhasbeentechnicallyrevised.Themainchangesareasfollows: mandatorychoiceofthetransferfunctionformulationandqualityrequirementsforthecoherencefunction; analternativemicrophonearrangementandapplicationofalternatingtransferfunctionsarepresentedtocancelthedistortionduetodestructiveinterferenceatthemicrophonepositions.AlistofallpartsintheISO13472seriescanbefoundontheISOwebsite.Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheuser'snationalstandardsbody.Acompletelistingofthesebodiescanbefoundatwww.iso.org/members.htmLIntroductionThismethodprovidesameanstoevaluatethesoundabsorptioncharacteristicsofaroadsurfacewithoutdamagingthesurface.ThefieldofapplicationislimitedtolowabsorptionsurfacessuchasthoseinaccordancewithISO10844Kandsimilarsurfaces.Duetoairleakagethemethodisnotreliableifthemeasure