【英文标准名称】:StandardTestMethodforImpedanceandAbsorptionofAcousticalMaterialsbyImpedanceTubeMethod
【原文标准名称】:用阻抗管法测定隔音材料的声阻抗与吸音性的标准试验方法
【标准号】:ASTMC384-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:吸收;阻抗;材料;试验;声学
【英文主题词】:absorption;impedance;impedanceratio;impedancetube;normalincidencesoundabsorptioncoefficient;specificnormalacousticimpedance
【摘要】:Theacousticalimpedancepropertiesofasoundabsorptivematerialarerelatedtoitsphysicalproperties,suchasairflowresistance,porosity,elasticity,anddensity.Assuch,themeasurementsdescribedinthistestmethodareusefulinbasicresearchandproductdevelopmentofsoundabsorptivematerials.Normalincidencesoundabsorptioncoefficientsaremoreusefulthanrandomincidencecoefficientsincertainsituations.Theyareused,forexample,topredicttheeffectofplacingmaterialinasmallenclosedspace,suchasinsideamachine.Estimatesoftherandomincidenceorstatisticalabsorptioncoefficientsformaterialscanbeobtainedfromnormalincidenceimpedancedata.Formaterialsthatarelocallyreacting,thatis,withoutsoundpropagationinsidethematerialparalleltoitssurface,statisticalabsorptioncoefficientscanbeestimatedfromspecificnormalacousticimpedancevaluesusinganexpressionderivedbyLondon(1).5Locallyreactingmaterialsincludethosewithhighinternallossesparallelwiththesurfacesuchasporousorfibrousmaterialsofhighdensityormaterialsthatarebackedbypartitionedcavitiessuchasahoneycombcore.Formulasforestimatingrandomincidencesoundabsorptionpropertiesforbothlocallyandbulk-reactingmaterials,aswellasformultilayersystemswithandwithoutairspaceshavealsobeendeveloped(2).1.1Thistestmethodcoverstheuseofanimpedancetube,alternativelycalledastandingwaveapparatus,forthemeasurementofimpedanceratiosandthenormalincidencesoundabsorptioncoefficientsofacousticalmaterials.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.
【中国标准分类号】:Q25
【国际标准分类号】:91_120_20
【页数】:9P.;A4
【正文语种】:
基本信息
标准名称: | 标准电池 |
中标分类: |
仪器、仪表 >>
电工仪器仪表 >>
交支流电工仪器记录仪器 |
替代情况: | ZB Y302-1985 |
发布日期: | |
实施日期: | 1997-07-01 |
首发日期: | |
作废日期: | 2005-04-15 |
出版日期: | |
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所属分类: 仪器 仪表 电工仪器仪表 交支流电工仪器记录仪器