【英文标准名称】:StandardTestMethodforAirflowResistanceofAcousticalMaterials
【原文标准名称】:隔声材料气流阻力的标准试验方法
【标准号】:ASTMC522-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【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】:1声学的;2气流阻力;3建筑物声学;4建筑;5材料;6电阻;7试验
【英文主题词】:absorption;acousticalmaterials;airflowresistance;airflowresistivity
【摘要】:Thespecificairflowresistanceofanacousticalmaterialisoneofthepropertiesthatdetermineitssound-absorptiveandsound-transmittingproperties.Measurementofspecificairflowresistanceisusefulduringproductdevelopment,forqualitycontrolduringmanufacture,andforspecificationpurposes.Validmeasurementsaremadeonlyintheregionoflaminarairflowwhere,asidefromrandommeasurementerrors,theairflowresistance(R=P/U)isconstant.Whentheairflowisturbulent,theapparentairflowresistanceincreaseswithanincreaseofvolumevelocityandthetermx201C;airflowresistancex201D;doesnotapply.ThespecificairflowresistancemeasuredbythistestmethodmaydifferfromthespecificresistancemeasuredbytheimpedancetubemethodinTestMethodC384fortworeasons.Inthepresenceofsound,theparticlevelocityinsideaporousmaterialisalternatingwhileinthistestmethod,thevelocityisconstantandinonedirectiononly.Also,theparticlevelocityinsideaporousmaterialisnotthesameasthelinearvelocitymeasuredoutsidethespecimen.1.1Thistestmethodcoversthemeasurementofairflowresistanceandtherelatedmeasurementsofspecificairflowresistanceandairflowresistivityofporousmaterialsthatcanbeusedfortheabsorptionandattenuationofsound.Materialscoverarangefromthickboardsorblanketstothinmats,fabrics,papers,andscreens.Whenthematerialisanisotropic,provisionismadeformeasurementsalongdifferentaxesofthespecimen.1.2Thistestmethodisdesignedforthemeasurementofvaluesofspecificairflowresistancerangingfrom100to10000mksrayls(Pas/m)withlinearairflowvelocitiesrangingfrom0.5to50mm/sandpressuredifferencesacrossthespecimenrangingfrom0.1to250Pa.Theupperlimitofthisrangeoflinearairflowvelocitiesisapointatwhichtheairflowthroughmostporousmaterialsisinpartialorcompletetransitionfromlaminartoturbulentflow.1.3AprocedureforaccreditingalaboratoryforthepurposesofthistestmethodisgiveninAnnexA1.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q25
【国际标准分类号】:91_120_20
【页数】:5P.;A4
【正文语种】:
基本信息
标准名称: | 4πγ电离室活度标准装置 |
英文名称: | Activity Standard Device for 4πr Ionization Chamber |
中标分类: |
综合 >>
计量 >>
电离辐射计量 |
发布部门: | 国家技术监督局 |
发布日期: | 1991-09-04 |
实施日期: | 1992-05-01 |
首发日期: | |
作废日期: | |
归口单位: | 中国计量科学研究院 |
起草单位: | 中国计量科学研究院 |
起草人: | 马国华 |
出版社: | 中国计量出版社 |
出版日期: | 1992-05-01 |
页数: | 10页 |
适用范围
本规程适于以4πγ电离室为探头、配以电离电流测量系统的活度测量标准装置的检定及量值复核。
前言
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目录
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引用标准
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所属分类: 综合 计量 电离辐射计量