【英文标准名称】:StandardGuideforSelectionofWeirsandFlumesforOpen-ChannelFlowMeasurementofWater
【原文标准名称】:用于明渠水流量测量的溢流堰和斜槽的选择的标准指南
【标准号】:ASTMD5640-1995(2008)
【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(US-ASTM)
【起草单位】:D19.07
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:flumes;open-channelflow;waterdischarge;weirs;Flowandflowrate--water;Flumes;Openchannelflow--wastewater;Openchannelflow--water;Selectionguides--testprocedures;Wastewatertesting/treatment;Waterdischarge/velocity;Weirs
【摘要】:Eachtypeofweirandflumepossessesadvantagesanddisadvantagesrelativetotheothertypeswhenitisconsideredforaspecificapplication;consequently,theselectionprocessofteninvolvesreachingacompromiseamongseveralfeatures.Thisguideisintendedtoassisttheuserinmakingaselectionthatishydraulically,structurally,andeconomicallyappropriateforthepurpose.Itisrecognizedthatnotallopen-channelsituationsareamenabletoflowmeasurementbyweirsandflumesandthatinsomecases,particularlyinlargestreams,dischargesmaybestbedeterminedbyothermeans.(See6.2.2.)1.1Thisguidecoversrecommendationsfortheselectionofweirsandflumesforthemeasurementofthevolumetricflowrateofwaterandwastewaterinopenchannelsunderavarietyoffieldconditions.1.2ThisguideemphasizestheweirsandflumesforwhichASTMstandardsareavailable,namely,thin-plateweirs,broad-crestedweirs,Parshallflumes,andPalmer-Bowlus(andotherlong-throated)flumes.However,referenceisalsomadetoothermeasurementdevicesandmethodsthatmaybeusefulinspecificsituations.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P12
【国际标准分类号】:
【页数】:7P.;A4
【正文语种】:英语


【英文标准名称】:Acoustics.Determinationofsoundpowerlevelsandsoundenergylevelsofnoisesourcesusingsoundpressure.Precisionmethodsforreverberationtestrooms
【原文标准名称】:声学.声压法测定噪声源声功率级.混响室精密法
【标准号】:BSENISO3741-2010
【标准状态】:现行
【国别】:英国
【发布日期】:2010-10-31
【实施或试行日期】:2010-10-31
【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】:吸收;声学测量;声学试验;声学;发出的空气噪声;音频系统;校正;浓缩;定义(术语);测定;护耳器;环境;过滤器;频率;搬运;听力试验;湿度;指示;信息;响度级;扬声器;低频;机械;数学计算;测量;测量环境;测量不确定度;测量仪器;测量室;测量技术;传声器;噪声;噪声(环境的);噪声测量;噪声源;观察;使用条件;位置;功率等级;精密度;混响;混响室法;混响室;房屋;机械安全性;声音;吸声;声强;声级;噪声值;声功率;声压;声源;规范(验收);标准差;表面;温度;试验;音量
【英文主题词】:Absorption;Acousticmeasurement;Acoustictesting;Acoustics;Airbornenoiseemitted;Audiosystems;Calibration;Concentration;Definitions;Determination;Earprotectors;Environment;Filters;Frequencies;Handling;Hearingabilitytests;Humidity;Indications;Information;Loudnesslevels;Loudspeakers;Lowfrequencies;Machines;Mathematicalcalculations;Measurement;Measuringenvironment;Measuringincertainity;Measuringinstruments;Measuringrooms;Measuringtechniques;Microphones;Noise;Noise(environmental);Noisemeasurements;Noisesources;Observation;Operatingconditions;Position;Powerlevels;Precision;Reverberation;Reverberationroommethod;Reverberationrooms;Rooms;Safetyofmachinery;Sound;Soundabsorption;Soundintensity;Soundlevel;Soundlevels;Soundpower;Soundpressure;Soundsources;Specification(approval);Standarddeviation;Surfaces;Temperature;Testing;Volume(sound)
【摘要】:ThisInternationalStandardspecifiesmethodsfordeterminingthesoundpowerlevelorsoundenergylevelofanoisesourcefromsoundpressurelevelsmeasuredinareverberationtestroom.Thesoundpowerlevel(or,inthecaseofnoiseburstsortransientnoiseemission,thesoundenergylevel)producedbythenoisesource,infrequencybandsofwidthone-third-octave,iscalculatedusingthosemeasurements,includingcorrectionstoallowforanydifferencesbetweenthemeteorologicalconditionsatthetimeandplaceofthetestandthosecorrespondingtoareferencecharacteristicimpedance.Measurementandcalculationproceduresaregivenforbothadirectmethodandacomparisonmethodofdeterminingthesoundpowerlevelandthesoundenergylevel.Ingeneral,thefrequencyrangeofinterestincludestheone-third-octavebandswithmid-bandfrequenciesfrom100Hzto10000Hz.GuidelinesfortheapplicationofthespecifiedmethodsoveranextendedfrequencyrangeinrespecttolowerfrequenciesaregiveninAnnexE.ThisInternationalStandardisnotapplicabletofrequencyrangesabovethe10000Hzone-third-octaveband.NOTEForhigherfrequencies,themethodsspecifiedinISO9295canbeused.
【中国标准分类号】:Z32
【国际标准分类号】:17_140_01
【页数】:72P.;A4
【正文语种】:英语