【英文标准名称】:Acoustics-Laboratorymeasurementproceduresforductedsilencersandair-terminalunits-Insertionloss,flownoiseandtotalpressureloss
【原文标准名称】:声学.管道消音器和气体终端设备的实验室测量步骤.插入损失、流动噪声和总压损失
【标准号】:BSENISO7235-2003
【标准状态】:作废
【国别】:英国
【发布日期】:2003-09-08
【实施或试行日期】:2003-09-08
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:定义;试验;测量管道;声压级;声学;通风设备;阻尼(波);测量;噪声测量;测量技术;声学试验;管道;声学测量;流动;压力降;测量仪器;噪声;声级;发动机消音器;声强;符号;衰减常数;介入损耗;消声器;测量设备;通风道工程
【英文主题词】:Absorption;Acousticmeasurement;Acoustictesting;Acoustics;Airducts;Airflow;Attenuationconstant;Cables;Calibration;Canals;Checkingequipment;Classes;Clay;Corrrections;Damping;Definitions;Ducts;Enginesilencers;Equipment;Externalnoise;Fans;Flow;Graphicsymbols;Handling;Insertionloss;Laboratories;Laboratorytesting;Laboratorytests;Loudspeakers;Measurement;Measurementcircuits;Measuringducts;Measuringenvironment;Measuringequipment;Measuringinstruments;Measuringobjects;Measuringtechniques;Microphonearrangement;Microphones;Mineralwool;Noise;Noiseabatement;Noise(environmental);Noisemeasurements;Performancetests;Precision;Pressuredrops;Reflection;Reverberationrooms;Silencers;Sonictesting;Sound;Soundabsorption;Soundfields;Soundintensity;Soundlevel;Soundlevels;Soundmeters;Soundpressure;Soundpressurelevel;Soundsources;Structure-bornenoise;Symbols;Testfurnaces;Testresults;Testing;Testingset-ups;Transmittances;Ventilationductwork;Ventilationequipment;Walls
【摘要】:ThisInternationalStandardspecifiesmethodsfordetermining—theinsertionloss,infrequencybands,ofductedsilencerswithandwithoutairflow,—thesoundpowerlevel,infrequencybands,oftheflownoise(orregeneratedsound)generatedbyductedsilencers,—thetotalpressurelossofsilencerswithairflow,and—thetransmissionloss,infrequencybands,ofair-terminalunits.Themeasurementproceduresareintendedforlaboratorymeasurementsatambienttemperature.MeasurementsonsilencersinsituarespecifiedinISO11820.ItistobenotedthattheresultsdeterminedinalaboratoryaccordingtothisInternationalStandardwillnotnecessarilybethesameasthoseobtainedinsitu(installation),asdifferentsoundandflowfieldswillyielddifferentresults.Forexample,thepressurelosswillbelowerunderlaboratoryconditionsthaninsitu,butwillbecomparablebetweendifferentlaboratories.ThisInternationalStandardisapplicabletoalltypesofsilencerincludingsilencersforventilatingandair-conditioningsystems,airintakeandexhaustoffluegases,andsimilarapplications.Otherpassiveair-handlingdevices,suchasbends,air-terminalunitsorT-connectors,canalsobetestedusingthisInternationalStandard.ThisInternationalStandardisnotapplicabletoreactivesilencersusedformotorvehicles.NOTE1AnnexAspecifiesthesoundfieldexcitationequipment.AnnexBgivesrequirementsforthetransitionelement.AnnexCgivesdetailsofductwallsandlimitinginsertionloss.AnnexDspecifieshowtoconvertone-third-octavebandattentuationvaluestooctavebandvalues.AnnexEgivesrequirementsformeasurementsonlargeparallel-bafflesilencers.AnnexFspecifiesatestoflongitudinalattenuation.AnnexGgivesguidelinesonanechoicterminationsandAnnexHshowsexamplesofmeasurementarrangements.NOTE2Acoustictestingofair-terminaldevicesandfan-coilunitsistobecarriedoutasdescribedforair-terminalunits.NOTE3Soundpowermeasurementsonair-terminalunitsarespecifiedinISO5135.Measurementsofthepressurelossofair-terminalunitsaredescribedinEN12238,EN12239andEN12589.
【中国标准分类号】:Z32
【国际标准分类号】:17_140_99
【页数】:62P.;A4
【正文语种】:英语


【英文标准名称】:Informationtechnology8mmwidemagnetictapecartridgeforinformationinterchangeHelicalscanrecordingVXA-1formatAdoptedbyINCITS
【原文标准名称】:信息技术.信息交换用8mm宽盒式磁带.INCITS采用VXA-1格式螺旋扫描记录
【标准号】:ANSIISO/IEC20062-2001
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:ThisInternationalStandardspecifiesthephysicalandmagneticcharacteristicsofan8mmwidemagnetictapecartridgetoenablephysicalinterchangeofsuchcartridgesbetweendrives.Italsospecifiesthequalityoftherecordedsignals,therecordingmethodandtherecordedformatcalledVXA-1,andtherebyallowingdatainterchangebetweendrivesbymeansofsuchmagnetictapecartridges.ThisInternationalStandardspecifiesthreetypesdependingonthelengthofmagnetictapecontainedinthecase,referredtoasTypeA,TypeBandTypeC.
【中国标准分类号】:L64
【国际标准分类号】:35_220_23
【页数】:
【正文语种】:英语