ASTM E 1704-1995 规定隔音室声学性能的标准导则
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来源:标准资料网
【英文标准名称】:StandardGuideforSpecifyingAcousticalPerformanceofSound-IsolatingEnclosures
【原文标准名称】:规定隔音室声学性能的标准导则
【标准号】:ASTME1704-1995
【标准状态】:现行
【国别】:美国
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:声传输;噪声降低;声音;声学试验;性能;房屋;介入损耗;导则;外壳;声学系统;隔离室;级别降低
【英文主题词】:performance;soundtransmission;insertionloss;enclosures;sound;acousticaltests;acousticalsystems;isolatingenclosures;levelreduction;noisereduction;rooms;guide
【摘要】:
【中国标准分类号】:P31
【国际标准分类号】:17_140_00
【页数】:
【正文语种】:英语
【英文标准名称】:StandardSpecificationforCrushedAggregateforMacadamPavements
【原文标准名称】:碎石路面用碎集料的标准规范
【标准号】:ASTMD693a-2003
【标准状态】:现行
【国别】:美国
【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(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:4铺路;5铺路(道路);6公路建筑;1集料;2建筑;3建筑材料
【英文主题词】:roadconstruction;aggregates;pavements(roads);pavement;constructionmaterials;construction
【摘要】:
【中国标准分类号】:Q20
【国际标准分类号】:93_080_20
【页数】:3P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforDeterminingtheTrackingIndexofElectricalInsulatingMaterialsUsingVariousElectrodeMaterials(ExcludingPlatinum)
【原文标准名称】:使用多种电极材料(铂除外)测定电绝缘材料的痕迹指数的标准试验方法
【标准号】:ASTMD5288-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:copperelectrodes;comparativetrackingindex;CTI;TI;TI-Cu;track;tracking;tracking;contamination;trackingindex;trackingresistance;Comparativetrackingindex(CTI);Copperelectrodes;CTI-CU;Tracking,contamination;Trackingsystems;
【摘要】:Electricalequipmenthasthepotentialtofailasaresultofelectricaltrackingofinsulatingmaterialthatisexposedtovariouscontaminatingenvironmentsandsurfaceconditions.AnumberofASTMandothertestshavebeendesignedtoquantifybehaviorofmaterials,especiallyatrelativelyhighvoltages.Thismethodisanacceleratedtestwhichatrelativelylowtestvoltages,providesacomparisonoftheperformanceofinsulatingmaterialsunderwetandcontaminatedconditions.TheTrackingIndexx2014;CopperElectrodestestisnotrelateddirectlytothesuitableoperatingvoltageinservice.Whenorganicelectricalinsulatingmaterialsaresubjectedtoconductioncurrentsbetweenelectrodesontheirsurfaces,manyminutetree-likecarbonaceouspathsortracksaredevelopedneartheelectrodes.Thesetracksareorientedrandomly,butgenerallypropagatebetweentheelectrodesundertheinfluenceoftheappliedpotentialdifference.Eventuallyaseriesoftracksspanstheelectrodegap,andfailureoccursbyshortingoftheelectrodes.Asinothertrackingtestmethods,forexample,IEC112andTestMethodD3638,thistestmethodspecifiestestproceduresthatareintendedtopromotetheformationofsurfacedischargeswhichwillproducecarbontracksinareproduciblemanner.Sincetheseconditionsrarelyreproducetheactualconditionsencounteredinservice,theresultsoftrackingtestscannotbeusedtoinfereitherdirectorrelativeservicebehaviorofamaterialinaspecificdesignapplication.Trackingtestscanbeusedforscreeningpurposesonly.Suitabilityisverifiedthroughtestingofthematerialinactualenduseorunderconditionsthatcloselysimulateactualenduse.TheuseofcopperelectrodesinthistypeoftestwasdevelopedattheUniversityofCincinnati,NEMAlaboratory.ItisfeltbythemembersoftheIndustrialLaminatesSectionofNEMAthatusingcopperelectrodesgivesamorerealisticvalueforatrackingindex,relatedtotheresinsystemusedtoreinforcethesubstrateofalaminate.Ingeneral,trackingtestsmadewithcopperelectrodestendtogivelowervaluesthanplatinumelectrodesinthesametypeoftest.Itisafactthatcopperismorewidelyusedthanplatinumforelectricalconductors.1.1Thistestmethodwasdevelopedusingcopperelectrodestoevaluatethelow-voltage(upto600V)trackingresistanceofmaterialsinthepresenceofaqueouscontaminants.Note18212;Atthistime,onlyindustriallaminateshavebeenexaminedusingthismethodwhichwasdevelopedattheNationalManufacturersElectricalAssociation(NEMA)laboratorylocatedattheUniversityofCincinnati.Itwasfoundthatacloserendpoint(lessscatter)wasobtainedthanwithplatinumelectrodes,andmaterialstestedtendedtoberankedbyresinsystem.1.1.1Itisacceptabletoconsiderotherelectrodematerialsforusewiththistestmethoddependingupontheapplicationoftheinsulatingmaterial.1.2ThistestmethodissimilartoTestMethodD3638,whichdeterminesthecomparativetrackingindexofmaterialsusingplatinumelectrodestoproducethetrackingonthespecimensurface.1.3Thevaluesstatedinmetric(SI)unitsarethestandard.Theinch-poundequivalentsofthemetricunitsareapproximate.1.4Thisstandardisusedtomeasureanddescribetheresponseofmaterials,products,orassembliestoheatandflameundercontrolledconditions,butdoesnotbyitselfincorporateallfactorsrequiredforfirehazardorfireriskassessment......
【中国标准分类号】:K15
【国际标准分类号】:29_035_01
【页数】:5P.;A4
【正文语种】:英语
