【英文标准名称】:Acoustics.Determinationofsoundpowerlevelsofnoisesourcesusingsoundintensity.Measurementbyscanning
【原文标准名称】:声学.利用声强度对噪声源声功率级别的测定.使用扫描测量法
【标准号】:BSENISO9614-2-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-04-15
【实施或试行日期】:1997-04-15
【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】:准确度;声音吸收;声学测量;声学试验;声学;空气;校正;定义(术语);测定;护耳器;误差;外部噪声;气体流动;强度;机械;数学计算;测量;测量环境;测量不确定度;测量仪器;测量技术;方法;噪声;噪声控制(声学的);噪声排放;噪声(环境的);噪声测量;噪声源;精密度;性能;扫描器;扫描;声场;声强;声级;声功率;声源;规范(验收);温度;湍流度;风
【英文主题词】:Accuracy;Acousticabsorption;Acousticmeasurement;Acoustictesting;Acoustics;Air;Calibration;Definitions;Determination;Earprotectors;Errors;Externalnoise;Gasflow;Intensity;Machines;Mathematicalcalculations;Measurement;Measuringenvironment;Measuringincertainity;Measuringinstruments;Measuringtechniques;Methods;Noise;Noisecontrol(acoustic);Noiseemissions;Noise(environmental);Noisemeasurements;Noisesources;Precision;Properties;Scanners;Scanning;Soundfields;Soundintensity;Soundlevel;Soundpower;Soundsources;Specification(approval);Temperature;Turbulence;Winds
【摘要】:1ThispartofISO9614specifiesamethodformeasuringthecomponentofsoundintensitynormaltoameasurementsurfacewhichischosensoastoenclosethenoisesource(s)ofwhichthesoundpowerlevelistobedetermined.Surfaceintegrationoftheintensitycomponentnormaltothemeasurementsurfaceisapproximatedbysub-dividingthemeasurementsurfaceintocontiguoussegments,andscanningtheintensityprobeovereachsegmentalongacontinuouspathwhichcoverstheextentofthesegment.Themeasurementinstrumentdeterminestheaveragenormalintensitycomponentandaveragedsquaredsoundpressureoverthedur-ationofeachscan.Thescanningoperationmaybeperformedeithermanuallyorbymeansofamechan-icalsystem.Band-limitedweightedsoundpowerleveliscalcu-latedfromthemeasuredoctaveorone-third-octavebandvalues.Themethodisapplicabletoanysourceforwhichaphysicallystationarymeasurementsur-facecanbedefined,andonwhichthenoisesgener-atedbythesourceundertestandbyothersignificantextraneoussourcesarestationaryintime,asdefinedin3.13.Thesourceisdefinedbythechoiceofmeas-urementsurface.Themethodisapplicableinsitu,orinspecial-purposetestenvironments.ThispartofISO9614specifiescertainancillarypro-cedures,describedinannexB,tobefollowedinconjunctionwiththesoundpowerdetermination.Theresultsareusedtoindicatethequalityofthedeter-mination,andhencethegradeofaccuracy.Ifthein-dicatedqualityofthedeterminationdoesnotmeettherequirementsofthispartofISO9614,thetestprocedureistobemodifiedinthemannerindicated.ThispartofISO9614doesnotapplyinanyfrequencybandinwhichthesoundpowerofthesourceisfoundtobenegativeonmeasurement.2ThispartofISO9614isapplicabletosourcessituatedinanyenvironmentwhichisneithersovari-ableintimeastoreducetheaccuracyofthemeas-urementofsoundintensitytoanunacceptabledegree,norsubjectstheintensitymeasurementprobetogasflowsofunacceptablespeedorun-steadiness(see5.2.2,5.3and5.4).InsomecasesitwillbefoundthatthetestconditionsaretooadversetoallowtherequirementsofthispartofISO9614tobemet.Extraneousnoiselevelsmayexceedthedynamiccapabilityofthemeasuringin-strumentormayvarytoanexcessivedegreeduringthetest.InsuchcasesthemethodgiveninthispartofISO9614isnotsuitableforthedeterminationofthesoundpowerlevelofthesource.NOTE1Othermethods(e.g.determinationofsoundpowerlevelsfromsurfacevibrationlevelsasdescribedinISO/TR7849)maybemoresuitable.
【中国标准分类号】:Z32
【国际标准分类号】:17_140_01
【页数】:32P.;A4
【正文语种】:英语