【英文标准名称】:StandardTestMethodforMeasuringPavementMacrotexturePropertiesUsingtheCircularTrackMeter
【原文标准名称】:用环道计测量路面宏观结构性能的标准试验方法
【标准号】:ASTME2157-2001(2005)
【标准状态】:现行
【国别】:
【发布日期】:2001
【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】:E17.23
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:pavementtexture;skidresistance
【摘要】:InthePIARCInternationalExperiment(13)itwasfoundthatthevolumetricmeantexturedepth(MTD)washighlycorrelatedtothespeedconstantoftheInternationalFrictionIndex.IthasbeenfoundthattheaverageoftheMPDvaluesfortheeightsegmentsusingtheCTMeterisextremelyhighlycorrelatedwiththeMTDandcanreplacethevolumetricmeasurementfordeterminationoftheMTD(2).TherecommendedrelationshipfortheestimateoftheMTDfromtheMPDbytheCTMeteris:whenMTDandMPDareexpressedinmillimetres,or:whenMTDandMPDareexpressedininches.Note18212;TheseequationsdifferfromthosegiveninPracticeE1845,whicharefortheestimatedtexturedepthsfromlinearprofiles.ComparisonoftheMPDandtheRMSforasurfaceprovidesinformationofthenatureofthetexture,thatis,whetherthetextureispositiveornegative(3).Analysisoftheindividualsegmentscanbeperformedtoexaminetheprofileparalleltothedirectionoftravel(segmentsAandE)andperpendiculartothedirectionoftravel(segmentsCandG).Thisinformationcouldbeparticularlyusefulinthestudyofsurfacesthathavetexturewithsignificantdirectionalcharacteristics.1.1ThistestmethodcoverstheprocedureforobtainingandanalyzingpavementmacrotextureprofilesusingtheCircularTrackMeter(CTMeter).1.2TheCTMeterconsistsofachargecoupleddevice(CCD)laser-displacementsensorwhichismountedonanarmthatrotatessuchthatthedisplacementsensorfollowsacirculartrackhavingadiameterof284mm(11.2in.).1.3TheCTMeterisdesignedtomeasurethesamecirculartrackthatismeasuredbytheDynamicFrictionTester(DFTester).1.4TheCTMetercanbeusedbothforlaboratoryinvestigationsandinthefieldonactualpavedsurfaces.1.5ThesoftwaredevelopedfortheCTMeterreportstheMeanProfileDepth(MPD)andtheRootMeanSquare(RMS)valuesofthemacrotextureprofiles.1.6ThevaluesstatedinSI(metric)unitsaretoberegardedasstandard.Theinch-poundequivalentsarerationalized,ratherthanexactmathematicalconversions.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:R66
【国际标准分类号】:93_080_20
【页数】:5P.;A4
【正文语种】:


【英文标准名称】:Instrumenttransformers-Part7:electronicvoltagetransformers.
【原文标准名称】:仪表用变压器.第7部分:电子变压器
【标准号】:NFC42-544-7-2001
【标准状态】:现行
【国别】:法国
【发布日期】:2001-10-01
【实施或试行日期】:2001-10-05
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:保护电流;电流互感器;电气工程;缺陷与故障;电子测量装置;电压互感器;仪表用变压器;电流强度;定义;保护设备;故障电流;标准值;电学测量仪表;测量仪器;变压器;规范(验收);安全工程;额定值;试验;绝缘;测量技术
【英文主题词】:
【摘要】:
【中国标准分类号】:L17
【国际标准分类号】:17_220_20
【页数】:82P;A4
【正文语种】:其他