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1、5SOInternationa1.StandardISO4678Firstedition2024-01Shipsandmarinetechno1.ogy一NoisemeasurementmethodforHVACsysteminaccommodationspacesNaviresettechno1.ogicmaritimeMe1.hodepourIemesuragedubruitdusystmeCVCAdansIesIocauxReferencenumberISO46782024(en)COPYRIGHTPROTECTEDDOCUMENTISO2024WintGhcdBdHUWwdotherw
2、iseianSit111.CrW4wErtiwnbxtt11mik)hrtRd11kHimhwfrpn911tnmcnpyiptheinternetoranintranet,withoutpriorwrittenpermission.PermissiononberequestedfromeitherISOatthebe1.oworISOsmemberbodyinthecountryoftherequester.b,Vyfrfiandonnet8CH-1214VcmicrrGcncvaPhoae:*41227490111聊独te:薪括嬴OQrgPub1.ishedinSwitzer1.andCo
3、ntentsPageForewordivitroductionv2 Scope13 Normativereferences14 Termsanddefinitions1Instrumentation24.4.4.123Microphonewithsound1.eve1.meterorothermicrophoneamp1.ifier2Microphonecab1.e2FreqUeney一.一.一.一.2Noseconeandana1.yserindshie1.dSound1.eve1.recorderorotherdatasamp1.ingdevices-3Ihb1.ationof.*1.11
4、.1.1.*a.1.*.a.1-.1.1.3Genera1.requirements3Measurementprocedure34.1 Out1.etnoisemeasurement34.2 Backgroundnoisemeasurementandout1.etnoisecorrection.4g.y,tmct.S6.4.1 Exhaustout1.etnoise1.eve1.56.4.2 Ca1.cu1.ationofthecabinsoundabsorption67Measurementreport77.1 Measurementcompanyandpersonne1.77.2 Ship
5、particu1.ars77.3 .*_.77.5 MeasuringconditionsB7.6 NfeasurementC1.ata.8Bib1.iography.9HiForewordISO(theInternationa1.OrganizationforStandardization)isaWOHdwidefederationofnationa1.standardsIMdIiest触UimatbnnbtidM明岷IWnribefPrbPdNMEtetfndtiOna1.Stauddpe1.而noseconemicrophoneshie1.ddesignedtosubstitutethe
6、norma1.protectiongridofthemicrophoneandusedinhigh-ve1.ocityairf1.owswith1.owturbu1.enceand1.itt1.eswir1.havingastream1.inedshapewiththe1.eastpossib1.ethevsIStcipbotodwIgndwh11Hbviretnmeatedaro(codeitsihtiy11itoophP三wvomws11itatrtnofthediaphragmNote1toentry:Scc4we4.Figure1-Schematicdiagramofanosecone
7、3.2windshie1.ddevicedesignedfortheinsertionofthemicrophoneandpreamp1.ifier,takingtheformofaba1.1.ofopen-poredfoamwithacy1.indrica1.ho1.eofappropriatediameterandnottoaffectthedirectivityofthemicrophoneNote1toentry:Aminimumsizeofthewindshie1.dissuggestedtodiameterof60mm.Figure2Schematicdiagramofawinds
8、hie1.dNote21entry:SeeFigure2.3.3pinknoiserandomnoisesigna1.withaspectra1.densitythatdecreasesby3dBperoctave,givingconstantenergjrper购avewhitenoiserandomnoisesigna1.havingequa1.intensityatdifferentfrequencies,givingitaconstantpowerspectra1.density4 Instrumentation4.1 Microphonewithsound1.eve1.meteror
9、othermicrophoneamp1.ifierAmicrophonecombinedwithasound1.eve1.meterorothermicrophoneamp1.ifiersha1.1.beused,asrequired21ECN,rtIound1.eve1.meter.HH88同hWSAWTme而StUbancN嫩FBiH视PeffE,dueWF?Wrfi)eratureorairf1.owacrossthecab1.e,shou1.dnotproducenoisethatinterfereswiththemeasurement.4.3 Frequencyana1.yserTh
10、efrequencyana1.ysersha1.1.useaone-third-octave-bandfi1.tersetasrequiredbyIEC61260-1.Thefi1.terbandcentrefrequenciessha1.1.beinaccordancewithISO266.4.4 Noseconeandwindshie1.dTheuseofanoseconeorwindshie1.disdesirab1.etooffsettheeffectofairf1.ow.Theinuenccofnoseconetimirw8ttteMe1.damithewin1.siHti曜W浏tt
11、he附WiSPHoeSKbaHhhvnnOfinstrumentsTherJ拗Hn帼色accor丽帆brtf缺困曲切忡凯H丽解曲MFtbyf1.ftw杀眼(油精去。慎#蝴眠制rspe由Ebymanufacturer.5 Genera1.requirementsNoise1.eve1.measurementshou1.dbecarriedoutafterthecomp1.etionoftheshipconstructionwitha1.1.PWetoHniCaiWhH币mmdi&wrtOtaedbaOtaW1.5tm11dg8kii则06(nUinIVQhiHiyAeinn1.fGitbrDfp
12、c由讯Uiwiechanica1.equipment,suchasdiese1.generatorsets.JHct阑把船tcm*蒯nRj1.fcF2E明位观1.强?iR%领碗盟川跟VratC.thedesignconditions,andeachexhaustDoorsandwindowsshou1.dbec1.osedtight1.y.崛Cn部掘需用2yw做1.ft欧胸蜘书嫄淄6p并服除飙掘FnenIag网t1.限晒幽。田牝骁贺f%nva1.uesCanbecorrectedaccordingtothesteady-statebackgroundnoise.Whenmeasuringthe
13、noise1.eve1.,measuringaccommodationspaces,thereshou1.dbenopersonexceptthemeasurementoperatorintheThenoise1.eve1.measurementshou1.dbecarriedoutusinganintegra1.measurementmethod,andastab1.ereBE1.珊g&ngfi目&.1.east30ssha1.1.beobtainedtorepresenttheaverageva1.ueofthechangesduetochanges6Measurementprocedur
14、e6.1Out1.etnoisemeasurementFirst1.y,checkandrecordtheoperatingstatusofthemeasuredHVACsystem,especia1.1.yiftheindividua1.eetarded。ItHetsmeiemmenta由Jrttedaccordingtothedesignatedf1.owrate.Thedataoff1.owratesshou1.dbeInordertoreducetheturbu1.enceeffectofairf1.owfromtheout1.etsandto1.owerthemeasuremente
15、rror,曲断a1.歌儿那nc蜘1.n(曲蹦颜虱酬qnicroph*A幽煦姮(Ka酬腑眈恤CXhaU纲啾II佃isang1.ePositionang1.eofthemrophone,a,shou1.dbebetween300and4bowithinc1.inationtothep1.aneofthecei1.ing,asshowninFigure3.Forthecaseofout1.etsnearthecornersofthecabin,thereisnotenoughspacetop1.acethreemicrophones;oneortwomicrophonesofthoseshou1.d
16、beadopted.a三30o-45o,J=120%=1.mKey2 duct3 out1.et4 cei1.ing5 microphone6 tripodFigure3-ArrangementofthemicrophonesIftherearemorethantwoexhaustout1.etsina1.argespace,eachout1.etinthespaceshou1.dbemeasured.ifthw(pnnscsfbenrdnxitsou1.dnotbemadewhenthedistancebetweenthemicrophoneandtheboundary6.2 Backgro
17、undnoisemeasurementandout1.etnoisecorrectionThebackgroundnoisemeasurementsha1.1.bemadebeforeoraftertheout1.etnoisemeasurement,whenHVACsystemisswitchedoff.Thebackgroundnoisesha1.1.bedeterminedwiththeequiva1.entcontinuoussoundpressure1.eve1.overaperiodofapproximate1.y30s.Thesamemicrophonepositionsused
18、fortheout1.etnoisemeasurementsha1.1.beused.Ca1.cu1.atetheenergeticaverageofthebackgroundnoise1.eve1.inthethreepositionsbeforecorrectionoftheout1.etnoise1.eve1.Out1.etnoisecorrectionshou1.dbemadeaccordingtoTab1.e1.6.3 Reverberationtimemeasurementintegratedimpu1.seresponses1.oudspeaker,inaccordanceWit
19、hgenerate3382-2,SoUndWithinmeaSUreroomreverberationThereverberationisusua1.1.yp1.acedindependsonthePositiontoofbethetested.Thenumberreceivingmicrophone,positionsha1.1.betooc1.osetoanysource-positioninordertoavoidtoostronginf1.uencefromthedirectsound.Measurethebackgroundnoise1.eve1.swiththeHVACsystem
20、off.higherSpeakerbackgroundnoise1.eve1.,sound1.eve1.meter.Themeasurednoise1.eve1.sha1.1.be35dBto4SdBstopthemeasuremen1.difficu1.t,measuringreverberationmeasuringitequipmentCanthatpresen1.nooneinthespace.Ifthisispractica1.1.y6.4 Resu1.tprocessing6.4.1 Exhaustout1.etnoise1.eve1.bytheenergyaveragingofn
21、oisemeasuredbytheusedmicrophones,usingFonwIa(I).18m1.f)/-1M1.ishou1.dthangivenout1.etsaresuperimpositionofcabinr1.eve1.sfromeachthiscabinout1.etswhi1.etheexhaustout1.etsNU10=1.)ISO2024-A1.1.rightsreservedThereverberationtimesha1.1.bemeasuredbytheinterruptedsoundsourcemethod,ora1.ternative1.ythetime,
22、soundsource,1.e.amethod,sha1.1.beusedtoISOtheInordertothethemonitorthedecayofsoundpressure1.eve1.afterthesoundceases.1.oudspeakertimeofthespaceacornerofspacesourceandtheandpositionofthemicrophonesarethesameasthoseoftheexhaustnoisemeasurements.Thedistancefromanymicrophonepositiontothenearestref1.ecti
23、ngsurface,inc1.udingthe11oorrshou1.dbeat1.east1maway.Nomicrophone-TheinstrumentsusedinthemeasurementOfreverberationtimeshou1.dbecapab1.eofdisp1.ayingand/oreva1.uatingdecayrecordscurves.RefertoISO3382-2.The1.oudspeakersha1.1.beusedasasoundsourceinthespace,andabroadbandornarrowbandnoisesigna1.withacon
24、tinuousspectrum,i.e.pinknoiseorwhitenoise,sha1.1.besenttothespeaker.Withthethantheinoperation,starttheTurnoffthe1.oudspeakeranda1.1.owthesoundtodecay.Waitforthebackgroundnoisetostabi1.ize,andthenThereverberationtimemeasurementshou1.dberepeatedat1.eastvetimestoaveragemu1.tip1.edatameasuredatthemicrop
25、honepositiontoreducemeasurementuncertaintyduetostatistica1.deviation.Whentheoperatorofthetimerispreferab1.ebethereisIftheHVACsystemhason1.yoneexhaustout1.etintheAhcabin,itsexhaustout1.etnoise1.eve1.,1.itisobtained1.p-Outie1.1.;=101og(IO1.oMwhereisthenumberofmicrophonesfornoisemeasurementofthe沁out1.e
26、tinacabin;isnoise1.eve1.ofthe/thmicrophone,indB;/-IXOiK1.ctisexhaustout1.etnoise1.eve1.froma1.1.theexhaustout1.ets,indB.Ifmorebet,obyenergrtesteda1.argenoisethenoise1.eve1.ofofthefroma1.1.otherareswitchedoff,usingFormu1.a(2):一o)whereNfisthenumberofout1.etstobetestedinacabin;1.iisnoise1.eve1.ofrthout
27、1.et,indB;1.PQMIeCisexhaustout1.etnoise1.eve1.froma1.1.theexhaustout1.ets,indB.6.4.2Ca1.cu1.ationofthecabinsoundabsorptionThecabinsoundabsorptionisca1.cu1.atedbasedonthereverberationtimeandcabinparametersusingthefo1.1.owingSabinets4jo11u1.a():046T)whereVSisthevo1.umeofthecabininm3；aisthetota1.surfac
28、eareaofcabininm2;istheaverageabsorptioncoefficientofcabinsurfaces；T30isthetimetakentodecay30dB.Anotherquantityrpronti11gtheacousticpropertyofacabinisroomconstantR,whichisre1.atedtosoundabsorpti世abyFormu1.a(4)：USi喟jpg1坨尤/用JonOfSnIaHsoundabsorption,Formu1.a(5)canheyie1.ded:Soundpressure1.eve1.duetodif
29、fractioninareverberantcabinp.revcanbeca1.cu1.atedbyFormu1.a(6):如“=1.fioiog,6.4.3Determinationoftheventnoise1.eve1.sAsthemeasurednoise1.eve1.ofexhaustout1.etisasummationoftheventnoisewithdiffractedsoundttheuntFnome(i1.,e1.issimp1.yobtainedbyremovingdiffractedsoundfromthemeasuredout1.etnoise,asshown-1
30、61.p,vent=1.pxOUt1.ct.1.p.rev(7)where1.pvntisventnoise1.eve1.;p.oteisthecabinnoise1.eve1.fromexhaustout1.et;1.p,re%issoundpressure1.eve1.duetocabinreverberation.6.5MeasurementuncertaintiesTheuncertaintyofonboardmeasurementdependsonsevera1.factors,forexamp1.e,measurementIWnmmWtHrtfch,thie1MnMttMwrt*f
31、(resexcotions,erw1.他nmenta1.rm(ibi1.is5midaEd4Fiati91*tieteequiva1.entcontinuoussoundpressure1.eve1.equa1.toor1.essthan1,5dB;howeveritrisesto3,0dBforfrequencies1.essthan100Hz,androomswithvo1.umes1.essthan30ms.Tab1.e1-Correctedva1.ueaccordingtodifferencebetweenout1.etandbackgroundnoiseDifferencebetwe
32、enout1.etandbackgroundnoise1.eve1.,Correctedva1.uetoout1.etnoise1.eve1.dBre1.ativeto20PadBre1.ativeto20Pa4-5-27Measurementreport7.1 Measurementcompanyandpersonne1.Thegenera1.informationofthemeasurementcompanysha1.1.inc1.udeat1.eastthefo1.1.owing：a) name;b) measurementoperator.7.2 Shipparticu1.arsThegenera1.descriptionoftheshipsha1.1.inc1.udeat1.eastthefo1.1.owing:a) nameofship；b) nameofshipyard；c) typeofship;d) dimensions,1.BD(1.ength,breadth,depth)；e) mainenginedata.7.3 HVACparticu1.arsHeating,venti1.ationandairconditioningsystemparticu1.arssha1.1.inc1.udeat1.eastthefo1.1.owing
