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【英文标准名称】:Acoustics-Measurementoftheinsitusoundattenuationofaremovablescreen
【原文标准名称】:声学.可移动声屏障声衰减的现场测量
【标准号】:BSENISO11821-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-10-15
【实施或试行日期】:1997-10-15
【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】:性能试验;可拆卸的;误差修正;现场试验;噪声控制;衰减;吸收(波);声学测量;噪声控制装置;遮板(隔墙);声学试验;隔音;声试验
【英文主题词】:
【摘要】:ThisInternationalStandardspecifiesmethodsforevaluatingtheinsitusoundattenuationperformanceofaremovablescreen,eitherindoorsoroutdoors.Thisengineeringgrademethodisbasedonaninsertionlossmeasurementthatcanbecarriedouteitherwithshieldingoftheactualsoundsource(s)orusinganartificialsoundsource.Thesoundattenuationperformanceachievedbysuchascreen,asevaluatedbythepresentInternationalStandard,dependson:—diffractionaroundtheedgesofthescreen;—transmissionthroughthecomponentsofthescreen;—absorptionofthepanelsofthescreen,aswellasinitssurroundings;—theroominwhichthescreenstandsifindoors.Whenaspecificworkstationistobeshielded,theinsitusoundattenuationvaluedescribestheeffectofthescreen.However,whenacompleteareaistobeshielded,theperformanceofthescreenwillvarydependingonthepositionsusedformeasurement.Therefore,itisrecommendedthatthemaximumandminimumvaluesofsoundattenuationaregiven.Thesoundattenuationperformanceisdeterminedintermsofinsertionloss.Whenassessingtheperformanceofascreenlocatedindoors,theroomgeometryandreflectionsfromwalls,ceilingsandroomfittingswillinfluencetheperformance.Asaconsequence,thecomparisonofscreenperformancecanonlybemadeifthetestconditionsareidentical.ThisInternationalStandardisapplicabletoscreenswithheightandlengthgreaterthan1,5m.However,itmayalsobeusedforsmallerscreensprovidedthattheinterestedpartiescometoanagreementonthis.Asenvironmentalconditionscanaffectthemeasurementsoutdoors,itisrecommendedthatmeasurementsshouldberestrictedtowithin25mofthescreen.However,measurementsmayalsocoveragreaterdistanceprovidedthattheinterestedpartiescometoanagreementonthis.Differencescanoccurbetweeninsitutestresults.Therefore,comparisonoftheperformanceofdifferentscreenscanbemadeonlyonthebasisofdatabasedonthesamemeasurementmethodperformedatthesamelocation.ThisInternationalStandardappliestoacompletescreenonlyandnottoindividualcomponentsfromwhichitismade.Soundinsulationandsoundabsorptionforscreencomponents(suchaspanelelements,doors,windows)shouldbemeasuredaccordingtootherrelevantstandards.ThisInternationalStandardisnotapplicabletoopenplanofficesscreensnortooutdoorbarriersdealingwithcommunitynoise.Itisalsonotintendedforqualificationpurposes.
【中国标准分类号】:A42
【国际标准分类号】:17_140_99
【页数】:20P;A4
【正文语种】:英语


【英文标准名称】:SpecificationforStyrenicThermoplasticElastomerInjectionMoldingandExtrusionMaterials(TES)(08.03)
【原文标准名称】:苯乙烯热塑性塑料弹性体注塑模塑和挤塑材料的规格
【标准号】:ANSI/ASTMD4474-1991
【标准状态】:作废
【国别】:美国
【发布日期】:1991
【实施或试行日期】:
【发布单位】:美国国家标准学会(ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:苯乙烯;挤压;弹性体;塑料
【英文主题词】:plastics;styrene;elastomers;extruding
【摘要】:Thisclassificationandsubsequentlinecallout(specification)coverstyrenicblockcopolymerthermoplasticelastomermaterialsforinjectionmoldingandextrusion.Copolymersconsistofpolystyrenesegmentsboundtorubberysegments.Therubberysegmentsmaybesaturatedorunsaturated.Compoundingingredientsmaybepresentasnecessaryfortheapplication.Thecompoundingingredientsmayconsistofreinforcements,resins,plasticizers,fillers,stabilizers,andcolorants.Recycledstyrenicthermoplasticelastomersarenotcoveredinthisclassification.Thepropertiesincludedinthisclassificationarethoserequiredtoidentifythecompositionscovered.Theremaybeotherrequirementsnecessarytoidentifyparticularcharacteristicsthatareimportanttospecializedapplications.ThesemaybedescribedbyusingthesuffixesspecifiedinSection5.ThevaluesstatedinSIunits,asdetailedinIEEE/ASTMSI10,aretoberegardedasthestandard.Note1-ThereisnoequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_060
【页数】:
【正文语种】:英语