EN 61721-1999 光伏组件对意外碰撞的承受能力(抗冲击试验)
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【英文标准名称】:Susceptibilityofaphotovoltaic(PV)moduletoaccidentalimpactdamage(resistancetoimpacttest)(IEC61721:1995);GermanversionEN61721:1999
【原文标准名称】:光伏组件对意外碰撞的承受能力(抗冲击试验)
【标准号】:EN61721-1999
【标准状态】:现行
【国别】:
【发布日期】:2000-08
【实施或试行日期】:2000-08-01
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:光电电池;灵敏性;冲击试验;电气工程;光电器件;光伏电池;试验;太阳能
【英文主题词】:Electricalengineering;Impacttesting;Impacttests;Photovoltaiccells;Photovoltaics;Solarenergy;Susceptibility;Testing
【摘要】:
【中国标准分类号】:L53
【国际标准分类号】:27_160
【页数】:5P.;A4
【正文语种】:英语
【英文标准名称】:Acoustics-Determinationofsoundabsorptioncoefficientandimpedanceinimpedancetubes-Transfer-functionmethod
【原文标准名称】:声学.阻抗管中吸声系数和阻抗的测定.第2部分:传递函数法
【标准号】:BSISO10534-2-1999
【标准状态】:现行
【国别】:英国
【发布日期】:1999-05-15
【实施或试行日期】:1999-05-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:声学工程;传递函数;波长;误差修正;比率;频率;声学测量;声学;方程;基座;声学试验;误差;反射系数;声速;校正;精密度;报告;试验设备;声音吸收;试样;声试验;声学性质和声学现象;隔音;数学计算;施工材料;试验条件;建筑物
【英文主题词】:acousticmeasurement;soundabsorptioncoefficient;transmission;soundabsorption;buildingacoustics;acousticabsorption;acoustics;acoustictesting;determination
【摘要】:Thistestmethodcoverstheuseofanimpedancetube,twomicrophonelocationsandadigitalfrequencyanalysissystemforthedeterminationofthesoundabsorptioncoefficientofsoundabsorbersfornormalsoundincidence.Itcanalsobeappliedforthedeterminationoftheacousticalsurfaceimpedanceorsurfaceadmittanceofsoundabsorbingmaterials.Sincetheimpedanceratiosofasoundabsorptivematerialarerelatedtoitsphysicalproperties,suchasairflowresistance,porosity,elasticityanddensity,measurementsdescribedinthistestmethodareusefulinbasicresearchandproductdevelopment.ThetestmethodissimilartothetestmethodspecifiedinISO10534-1inthatitusesanimpedancetubewithasoundsourceconnectedtooneendandthetestsamplemountedinthetubeattheotherend.However,themeasurementtechniqueisdifferent.Inthistestmethod,planewavesaregeneratedinatubebyanoisesource,andthedecompositionoftheinterferencefieldisachievedbythemeasurementofacousticpressuresattwofixedlocationsusingwall-mountedmicrophonesoranin-tubetraversingmicrophone,andsubsequentcalculationofthecomplexacoustictransferfunction,thenormalincidenceabsorptionandtheimpedanceratiosoftheacousticmaterial.Thetestmethodisintendedtoprovideanalternative,andgenerallymuchfaster,measurementtechniquethanthatofISO10534-1.ComparedwiththemeasurementofthesoundabsorptioninareverberationroomaccordingtothemethodspecifiedinISO354,therearesomecharacteristicdifferences.Thereverberationroommethodwill(underidealconditions)determinethesoundabsorptioncoefficientfordiffusesoundincidence,andthemethodcanbeusedfortestingofmaterialswithpronouncedstructuresinthelateralandnormaldirections.However,thereverberationroommethodrequirestestspecimenswhichareratherlarge,soitisnotconvenientforresearchanddevelopmentwork,whereonlysmallsamplesoftheabsorberareavailable.Theimpedancetubemethodislimitedtoparametricstudiesatnormalincidencebutrequiressamplesofthetestobjectwhichareofthesamesizeasthecross-sectionoftheimpedancetube.Formaterialsthatarelocallyreacting,diffuseincidencesoundabsorptioncoefficientscanbeestimatedfrommeasurementresultsobtainedbytheimpedancetubemethod.Fortransformationofthetestresultsfromtheimpedancetubemethod(normalincidence)todiffusesoundincidence,seeannexF.
【中国标准分类号】:A42
【国际标准分类号】:17_140_01
【页数】:34P;A4
【正文语种】:英语
【英文标准名称】:Methodsforpreparationofcalibrationgasmixtures.Comparisonmethodsandmethodsforestablishingtraceability.Checkingbyacomparisonmethod
【原文标准名称】:标定混合气体的制备方法.第9部分:比较法和溯源能力的确定方法.第2节:比较检验法
【标准号】:BS4559Sec.9.2-1988
【标准状态】:作废
【国别】:英国
【发布日期】:1988-02-29
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:公式;混合物;压缩气体;浓度(化学);准备;统计方法分析;气体;置信限;气体分析;误差分析;比较试验;验证;校正;含量测定;试验条件
【英文主题词】:
【摘要】:
【中国标准分类号】:G04
【国际标准分类号】:
【页数】:4P;A4
【正文语种】:英语
