【英文标准名称】:Acoustics-Determinationofsoundpowerlevelsofnoisesourcesusingsoundpressure-Surveymethodusinganenvelopingmeasurementsurfaceoverareflectingplane
【原文标准名称】:声学.用噪声压力测定噪声功率级.在反射平面上利用包封测量表面的测量法
【标准号】:BSENISO3746-1996
【标准状态】:作废
【国别】:英国
【发布日期】:1996-11-15
【实施或试行日期】:1996-11-15
【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】:声强;声学;测量特征;装配;声学测量;校正;噪声(环境的);声测量;半球形;方程;资格鉴定;试验设备;再现性;试验条件;噪声
【英文主题词】:Absorption;Acousticmeasurement;Acoustictesting;Acoustics;Calibration;Determination;Earprotectors;Envelopingsurfacemethods;Environment;Externalnoise;Fixings;Inspection;Installations;Machinenoise;Measurement;Measuringenvironment;Measuringinstruments;Measuringsurfaces;Methods;Microphones;Noise;Noise(environmental);Noisemeasurement;Noisemeasurements;Noisesources;Operation;Performancetests;Position;Precision;Reflective;Sonictesting;Soundabsorption;Soundlevel;Soundpower;Soundpressure;Soundsources;Specification(approval)
【摘要】:1GeneralThisInternationalStandardspecifiesamethodformeasuringthesoundpressurelevelsonameasure-mentsurfaceenvelopingthesourceinordertocal-culatethesoundpowerlevelproducedbythenoisesource.Itgivesrequirementsforthetestenvironmentandinstrumentationaswellastechniquesforobtain-ingthesurfacesoundpressurelevelfromwhichthesoundpowerlevelofthesourceiscalculated,leadingtoresultswhichhaveagrade3accuracy.Itisimportantthatspecificnoisetestcodesforvari-oustypesofequipmentbeestablishedandusedinaccordancewiththisInternationalStandard.Foreachtypeofequipment,suchnoisetestcodeswillgivedetailedrequirementsonmounting,loadingandop-eratingconditionsfortheequipmentundertestaswellasaselectionofthemeasurementsurfaceandthemicrophonearrayasspecifiedinthisInternationalStandard.NOTE1Thenoisetestcodeforaparticulartypeofequipmentshouldgivedetailedinformationontheparticularsurfacethatisselected,astheuseofdifferentlyshapedmeasurementsurfacesmayyielddifferingestimatesofthesoundpowerlevelofasource.2TypesofnoiseandnoisesourcesThemethodspecifiedinthisInternationalStandardissuitableformeasurementsofalltypesofnoise.NOTE2Aclassificationofdifferenttypesofnoise(steady,non-steady,quasi-steady,impulsive,etc.)isgiveninISO12001.ThisInternationalStandardisapplicabletonoisesourcesofanytypeandsize(e.g.device,machine,component,sub-assembly).NOTE3MeasurementsaccordingtothisInternationalStandardmaybeimpracticableforverytallorverylongsourcessuchaschimneys,ducts,conveyorsandmulti-sourceindustrialplants.3TestenvironmentThetestenvironmentthatisapplicableformeasure-mentsmadeinaccordancewiththisInternationalStandardmaybelocatedindoorsoroutdoors,withoneormorereflectingplanespresent,meetingspecifiedrequirements.4MeasurementuncertaintyForsourceswhichradiatesteadybroad-bandnoise,determinationsmadeinaccordancewiththisInter-nationalStandardresult,withfewexceptions,instandarddeviationsofreproducibilityoftheA-weightedsoundpowerlevelequaltoorlessthan3dB(ifK2AdeterminedinaccordancewithannexAislowerthan5dB)or4dB(ifK2Aiswithintherangeof5dBto7dB).Fordiscrete-tonesources,thestan-darddeviationofreproducibilityisnormally1dBgreater(seetable1).AsinglevalueofthesoundpowerlevelofanoisesourcedeterminedinaccordancewiththeproceduresgiveninthisInternationalStandardislikelytodifferfromthetruevaluebyanamountwithintherangeofthemeasurementuncertainty.Theuncertaintyinde-terminationsofthesoundpowerlevelarisesfromseveralfactorswhichaffecttheresults,someassoci-atedwithenvironmentalconditionsatthetestsiteandotherswithexperimentaltechniques.Ifaparticularnoisesourceweretobetransportedtoeachofanumberofdifferenttestsites,andif,ateachtestsite,thesoundpowerlevelofthatsourceweretobedeterminedinaccordancewiththisInternationalStandard,theresultswouldshowascatter.Thestandarddeviationofthemeasuredlevelscouldbecalculated(seeexamplesinISO7574-4:1985,annexB).Withfewexceptions,thesestandarddeviationswouldnotexceedthoselistedintable1.Thevaluesgivenintable1arestandarddeviationsofrepro-ducibility,σR,aredefinedinISO7574-1.Thevaluesoftable1takeintoaccountthecumulativeeffectsofmeasurementuncertaintyinapplyingtheproceduresofthisInternationalStandard,butexcludevariationsinthesoundpoweroutputcausedbychangesinop-eratingconditions(e.g.rotationalspeed,linevoltage)ormountingconditions.Themeasurementuncertaintydependsonthestan-darddeviationofreproducibilitytabulatedintable1andonthedegreeofconfidencethatisdesired.Asexample
【中国标准分类号】:Z32
【国际标准分类号】:17_140_01
【页数】:38P;A4
【正文语种】:英语