【英文标准名称】:Acoustics-Measurementsonsilencersinsitu
【原文标准名称】:声学.声器的现场测量
【标准号】:BSENISO11820-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-09-15
【实施或试行日期】:1997-09-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:噪声(环境的);导管;露天场地;装配;温度测量;房屋;消声器;噪声控制装置;声学测量;校正;现场试验;误差修正;声学试验;公式;流量测量;声强;压力试验
【英文主题词】:Acceptancetests;Acousticmeasurement;Acoustictesting;Acoustics;Definition;Definitions;Enginesilencers;Fieldmeasurement;Fieldtest;Insitu;Measurement;Noise;Noiseabatement;Noisemeasurements;Performancetests;Silencers;Types;Use
【摘要】:1ThisInternationalStandardspecifiesmeasure-mentsonsilencersinsitu.Itisapplicabletomeasure-mentsonsilencersinpracticalapplicationsforacousticanalysis,acceptancetestsandsimilarevaluations.ResultsobtainedinaccordancewiththisInternationalStandardcannotbecomparedtoper-formancedataobtainedfromlaboratorymeasure-mentsonductedsilencersinaccordancewithISO7235,partlybecauseofdifferenttestconditions(suchassoundfielddistribution,flow,temperatureandmountingconditions)andpartlybecauseofdifferentdefinitions.Dependingonthemethodused,themeasurementiseitherof—insertionlossDis,or—transmissionlossDts.Themeasurementmethoddependsuponthetypeofsilencerandtheinstallationconditions(e.g.insertionlossmeasurementsmustbecarriedoutforblowdownsilencers).NOTE1Thesubscriptsdenotethepracticalapplicationofthesilencerandtheparticularinstallationandoperatingconditions:Vstandsfor"insitu","t"fortransmission,and"i"forinsertion.Additionalcharacteristicquantities,whichcouldin-cludemeasurementstakenusingartificialsoundsourcesormeasurementstakentodeterminethedi-rectivityofsoundpropagationfromthesilencer,maybeagreeduponinaccordancewiththisInternationalStandard.2ThisInternationalStandardisapplicabletoa)silencerswhichareinstalledeitherasawholeorintheformofindividualbafflesinthepropagationpathofsound(e.g.openingsofducts)originatingfromasoundsource(machine,building,plantsuchasagasturbinegenerator,scrubbingplant,coolingtower,heatingventilationandaircon-ditioning(HVAC)plant,exhauststack,airintakeduct,weapon,internalcombustionengine,com-pressor,etc.);b)alltypesofpassivesilencers(absorptive,reac-tive,reflectionandblowdownsilencer);c)activesilencers(involvingamplifiersandloud-speakers)asfarastheinsertionlossofpassivesilencersisequivalenttotheoff/onconditionsofactivedevices;andd)othermeasuresormeansofeffectingacousticattenuationinairorothergases(e.g.componentsinstalledinducting,louvres,grillesanddeflectorhoods).Additionally,thisInternationalStandardisapplicabletothedeterminationoftheeffectofcleaningorrefurbish-ingsilencers.ThisInternationalStandardisnotapplicabletoclosedhigh-pressuresystems(e.g.silencersinclosedpipes)sincemeasurementsofstructure-bornesoundarenotanticipated.3Quantitiestobemeasuredincludethefollowing:a)soundpressurelevelsinoctavebandswithcentrefrequenciesatleastfrom63Hzto4kHzand,ifpossibleandrequired,from31,5Hzto8kHzorinone-third-octavebandswithcentrefrequenciesfrom50Hzto5kHzand,ifpossibleandrequired,from25Hzto10kHz—atapointorpointsonthesourcesideofasilencer,—atapointorpointsonthereceiversideofasilencer;b)staticanddynamicpressures,flowvelocitiesandtemperaturesatselectedpositions.Operatingdatatobedeterminedincludeflowrate,pressureandspeed,whichdefinetheoperatingcon-ditionsofthemachineorplanttobesilenced.
【中国标准分类号】:A42
【国际标准分类号】:17_140_99
【页数】:30P.;A4
【正文语种】:英语