GB/T 18776-2002 公差尺寸 英寸和毫米的互换算

作者:标准资料网 时间:2024-05-29 18:01:20   浏览:8160   来源:标准资料网
下载地址: 点击此处下载
基本信息
标准名称:公差尺寸 英寸和毫米的互换算
英文名称:Tolerance dimensions--Conversion form inches into millimetres and vice versa
中标分类: 机械 >> 机械综合 >> 基础标准与通用方法
ICS分类: 计量学和测量、物理现象 >> 长度和角度测量 >> 公差与配合
发布部门:中华人民共和国国家质量监督检验检疫总局
发布日期:2002-07-15
实施日期:2003-01-01
首发日期:2002-07-15
作废日期:1900-01-01
主管部门:国家标准化管理委员会
归口单位:全国产品尺寸和几何技术规范标准化技术委员会
起草单位:机械科学研究院、东风朝阳柴油机公司
起草人:李晓沛、周亚娟
出版社:中国标准出版社
出版日期:2003-01-01
页数:平装16开, 页数:9, 字数:15千字
书号:155066.1-18883
适用范围

本标准规定了英寸和毫米间相互换算的方法,以保证互换算后规定公差的呼唤性。

前言

没有内容

目录

没有内容

引用标准

没有内容

所属分类: 机械 机械综合 基础标准与通用方法 计量学和测量 物理现象 长度和角度测量 公差与配合
下载地址: 点击此处下载
【英文标准名称】:Soundsystemequipment-Part4:Microphones(IEC60268-4:2004);GermanversionEN60268-4:2004
【原文标准名称】:声系统设备.第4部分:传声器
【标准号】:EN60268-4-2004
【标准状态】:现行
【国别】:
【发布日期】:2004-07
【实施或试行日期】:2004-07-01
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:分类;测量技术;参考弧线;特性;测量;电气设备;天然噪音压力;参考釜;作标记;使用条件;环境条件;参数;声压级;阻抗;传输装置;声压;传声器;频率响应;频率曲线;传输系统;畸变系数;影响量;波幅;对称;传输系数;动力学;电声学;试验;非线性;噪声;电声器件;电气工程;电压测量;声传输
【英文主题词】:Acoustoelectricdevices;Amplitude;Classification;Distortionfactors;Dynamics;Electricalengineering;Electricalequipment;Electroacoustics;Environmentalcondition;Frequencycurve;Frequencyresponse;Impedance;Influencequantity;Marking;Measurement;Measuringtechniques;Microphones;Naturalnoisevoltage;Noise;Non-linearity;Operatingconditions;Parameters;Properties;Referenceaxes;Referencecurve;Soundpressure;Soundpressurelevel;Soundtransmission;Symmetry;Testing;Transfercoefficient;Transmissiondevices;Transmissionsystems;Voltagemeasuring
【摘要】:
【中国标准分类号】:M72
【国际标准分类号】:33_160_50
【页数】:49P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforMeasuringExtremeHeat-TransferRatesfromHigh-EnergyEnvironmentsUsingaTransient,Null-PointCalorimeter
【原文标准名称】:用瞬变零点量热器测量高能环境的超级传热速率的标准试验方法
【标准号】:ASTME598-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:E21.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:calorimeter;convective;heatflux;heatfluxgage;null-point;radiative;transienttemperature;Calorimeter--aerospaceapplications;Convectiveenergy;Extremeheattransferrates;Heatflux;Heatingtests--aerospacematerials;Heattransfer;Trans
【摘要】:Thepurposeofthistestmethodistomeasureextremelyhighheat-transferratestoabodyimmersedineitherastaticenvironmentorinahighvelocityfluidstream.Thisisusuallyaccomplishedwhilepreservingthestructuralintegrityofthemeasurementdeviceformultipleexposuresduringthemeasurementperiod.Heat-transferratesrangingupto2.84x00D7;102MW/m2(2.5x00D7;104Btu/ft2-sec)(7)havebeenmeasuredusingnull-pointcalorimeters.Useofcoppernull-pointcalorimetersprovidesameasuringsystemwithgoodresponsetimeandmaximumruntimetosensorburnout(orablation).Null-pointcalorimetersarenormallymadewithsensorbodydiametersof2.36mm(0.093in.)press-fittedintothenoseofanaxisymmetricmodel.Sourcesoferrorinvolvingthenull-pointcalorimeterinhighheat-fluxmeasurementapplicationsareextensivelydiscussedinRefs(3-7).Inparticular,ithasbeenshownbothanalyticallyandexperimentallythatthethicknessofthecopperabovethenull-pointcavityiscritical.Ifthethicknessistoogreat,thetimeresponseoftheinstrumentwillnotbefastenoughtopickupimportantflowcharacteristics.Ontheotherhand,ifthethicknessistoosmall,thenull-pointcalorimeterwillindicatesignificantlylarger(andtimedependent)valuesthantheinputorincidentheatflux.Therefore,allnull-pointcalorimetersshouldbeexperimentallycheckedforpropertimeresponseandcalibrationbeforetheyareused.Althoughacalibrationapparatusisnotverydifficultorexpensivetofabricate,thereisonlyoneknownsystempresentlyinexistence(6and7).Thedesignofnull-pointcalorimeterscanbeaccomplishedfromthedatainthisdocumentation.However,fabricationofthesesensorsisadifficulttask.Sincethereisnotpresentlyasignificantmarketfornull-pointcalorimeters,commercialsourcesofthesesensorsarefew.Fabricationdetailsaregenerallyregardedasproprietaryinformation.Someusershavedevelopedmethodstofabricatetheirownsensors(7).Itisgenerallyrecommendedthatthecustomershouldrequestthesuppliertoprovidebothtransientexperimentaltimeresponseandcalibrationdatawitheachnull-pointcalorimeter.Otherwise,theendusercannotassumethesensorwillgiveaccurateresults.Interpretationofresultsfromnull-pointcalorimeterswill,ingeneral,bethesameasforotherheat-fluxsensorsoperatingonthesemi-infinitesolidprinciplesuchascoaxialsurfacethermocouplesandplatinumthin-filmgages.Thatis,theeffectsofsurfacechemicalreactions,gradientsinthelocalflowandenergyfields,thermalradiation,andmodelalignmentrelativetotheflowfieldvectorwillproducethesamequalitativeresultsaswouldbeexperiencedwithothertypesofheatfluxsensors.Inaddition,signalconditioninganddataprocessingcansignificantlyinfluencetheinterpretationofnull-pointcalorimeterdata.1.1Thistestmethodcoversthemeasurementoftheheat-transferrateortheheatfluxtothesurfaceofasolidbody(testsample)usingthemeasuredtransienttemperatureriseofathermocouplelocatedatthenullpointofacalorimeterthatisinstalledinthebodyandisconfiguredtosimulateasemi-infinitesolid.Bydefinitionthenullpointisauniquepositionontheaxialcenterlineofadisturbedbodywhichexperiencesthesametransienttemperaturehistoryasthatonthesurfaceofasolidbodyintheabsenceofthephysicaldisturbance(hole)forthesameheat-fluxinput.1.2Null-pointcalorimetershavebeenusedtomeasurehighconvectiveorradiantheat-transferratestobodiesimmersedinbothflowingandstaticenvironme......
【中国标准分类号】:A54
【国际标准分类号】:17_200_10
【页数】:10P.;A4
【正文语种】:英语