DIN ISO 6879-1984 空气质量.空气质量测量方法的性能特征和有关概念

上一篇: DIN 38409-16-1984 德国检验水、废水和污泥的标准方法.作用和物质的通用测量方法(H组).酚指数的测定(H16)
下一篇: DIN 45669-2-1984 振动影响的测量.测量方法

【英文标准名称】:Quickopeningdevicesfordrypipevalvesforfireprotectionservice
【原文标准名称】:消防设备用干管阀门的快速开启装置
【标准号】:UL1486-1993
【标准状态】:作废
【国别】:美国
【发布日期】:1993-08
【实施或试行日期】:
【发布单位】:美国保险商实验所(US-UL)
【起草单位】:UL
【标准类型】:()
【标准水平】:()
【中文主题词】:开启的方法;管阀;喷头;阀门;防火;催速剂;消防喷水器;排气器;真空管器件组件
【英文主题词】:meansofopening;firesprinklers;valves;pipevalve;exhausters;valvedeviceassemblies;fireprotection;sprinkler;accelerators
【摘要】:
【中国标准分类号】:J16
【国际标准分类号】:13_220_20;23_060_20
【页数】:13P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforSoundAbsorptionandSoundAbsorptionCoefficientsbytheReverberationRoomMethod
【原文标准名称】:用混响室法测定吸声及吸声系数的标准试验方法
【标准号】:ASTMC423-2009a
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E33.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acoustical;acoustics;decayrate;noise;noisereductioncoefficient;reverberationroom;Acousticaltests;Decayrates;Noisereductioncoefficient;Reverberationroommethod;Soundabsorbing/insulatingmaterials/applications
【摘要】:Measurementofthesoundabsorptionofaroomispartoftheprocedureforotheracousticalmeasurements,suchasdeterminingthesoundpowerlevelofanoisesourceorthesoundtransmissionlossofapartition.Itisalsousedincertaincalculationssuchaspredictingthesoundpressurelevelinaroomwhenthesoundpowerlevelofanoisesourceintheroomisknown.Thesoundabsorptioncoefficientofasurfaceisapropertyofthematerialcomposingthesurface.Itisideallydefinedasthefractionoftherandomlyincidentsoundpowerabsorbedbythesurface,butinthistestmethoditisoperationallydefinedin4.2.Therelationshipbetweenthetheoreticallydefinedandtheoperationallymeasuredcoefficientsisundercontinuingstudy.Diffractioneffectsusuallycausetheapparentareaofaspecimentobegreaterthanitsgeometricalarea,therebyincreasingthecoefficientsmeasuredaccordingtothistestmethod.Whenthetestspecimenishighlyabsorptive,thesevaluesmayexceedunity.Thecoefficientsmeasuredbythistestmethodshouldbeusedwithcautionbecausenotonlyaretheareasencounteredinpracticalusageusuallylargerthanthetestspecimen,butalsothesoundfieldisrarelydiffuse.Inthelaboratory,measurementsmustbemadeunderreproducibleconditions,butinpracticalusagetheconditionsthatdeterminetheeffectiveabsorptionareoftenunpredictable.Regardlessofthedifferencesandthenecessityforjudgment,coefficientsmeasuredbythistestmethodhavebeenusedsuccessfullybyarchitectsandconsultantsintheacousticaldesignofarchitecturalspaces.FieldMeasurements8212;Whensoundabsorptionmeasurementsaremadeinabuildinginwhichthesizeandshapeoftheroomarenotundertheoperator''scontrol,theapproximationtoadiffusesoundfieldisnotlikelytobeveryclose.Thismattershouldbeconsideredwhenassessingtheaccuracyofmeasurementsmadeunderfieldconditions.(SeeAppendixX2foraprocedurethatcanbeusedinthefieldwithlesssophisticatedinstrumentation.)1.1Thistestmethodcoversthemeasurementofsoundabsorptioninareverberationroombymeasuringdecayrate.Proceduresformeasuringtheabsorptionofaroom,theabsorptionofanobject,suchasanofficescreen,andthesoundabsorptioncoefficientsofaspecimenofsoundabsorptivematerial,suchasacousticalceilingtile,aredescribed.1.2FieldMeasurements8212;Althoughthistestmethodprimarilycoverslaboratorymeasurements,thetestmethoddescribedin4.1canbeusedformakingfieldmeasurementsoftheabsorptionofrooms(seealso5.5).Anon-standardmethodtomeasuretheabsorptionofroomsinthefieldisdescribedinAppendixX2.1.3Thistestmethodincludesinformationonlaboratoryaccreditation(seeAnnexA1),asymmetricalscreens(seeAnnexA2),andreverberationroomqualification(seeAnnexA3).1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P31
【国际标准分类号】:91_120_20
【页数】:11P.;A4
【正文语种】:英语