JB 3980-1985 轿车制动器台架试验方法
作者:标准资料网 时间:2024-05-03 13:17:02 浏览:8718
来源:标准资料网
基本信息
标准名称: | 轿车制动器台架试验方法 |
中标分类: |
车辆 >>
汽车底盘与车身 >>
制动系统 |
替代情况: | 转化为QC/T 564-1999 |
发布日期: | |
实施日期: | 1992-10-01 |
首发日期: | |
作废日期: | |
出版日期: | |
适用范围
没有内容
前言
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目录
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引用标准
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所属分类: 车辆 汽车底盘与车身 制动系统
基本信息
标准名称: | 超高压管道维护检修规程 |
中标分类: |
化工 >>
化工机械与设备 >>
化工设备 |
替代情况: | 被SHS 03013-2004代替 |
发布日期: | |
实施日期: | 1992-11-09 |
首发日期: | |
作废日期: | 2004-06-21 |
出版日期: | |
页数: | 5页 |
适用范围
没有内容
前言
没有内容
目录
没有内容
引用标准
没有内容
所属分类: 化工 化工机械与设备 化工设备
【英文标准名称】:StandardPracticeforCalculatingInternationalFrictionIndexofaPavementSurface
【原文标准名称】:计算路面国际摩擦指数的标准实施规程
【标准号】:ASTME1960-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E17.21
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:摩擦;国际的;路面;灰泥;表面;试验方法
【英文主题词】:
【摘要】:ThisisthepracticeforcalculatingtheIFIofthepavement.TheIFIhasprovenusefulforharmonizationofthefrictionmeasuringequipment.F60andSphaveproventobeabletopredictthespeeddependenceofwetpavementx2013;relatedmeasurementsofthevarioustypesoffriction-measuringequipment.2ThetwoIFIparameters(F60andSp)havebeenfoundtobereliablepredictorsofthedependenceofwetpavementfrictionontireslipandvehiclespeed.TheIFIparameters,F60andSp,canbeusedtocalculatethecalibratedfrictionatanotherx2013;slipspeedusingatransformationequation.TheIFImodelgivenbelowdescribestherelationshipbetweenthevaluesofwetpavementfrictionFRSmeasuredataslipspeedofSandbetweenthefrictionvaluesmeasuredbydifferenttypesofequipment.AsignificanceoftheIFIModelisthatthemeasurementoffrictionwithadevicedoesnothavetobeatoneofthespeedsrunintheexperiment.FRScanbemeasuredatsomeSandisalwaysadjustedtoFR60.Thus,ifadevicecannotmaintainitsnormaloperatingspeedandmustrunatsomespeedhigherorlowerbecauseoftraffic,themodelstillworkswell.InthatcaseSisdeterminedbythevehiclespeed(V)whichcanbeconvertedtoSbymultiplyingVbythepercentslipforfixedslipequipmentorbymultiplyingVbythesineoftheslipangleforsideforceequipment.Thispracticedoesnotaddresstheproblemsassociatedwithobtainingameasuredfrictionormeasuredmacrotexture.1.1ThispracticecoversthecalculationoftheInternationalFrictionIndex(IFI)fromameasurementofpavementmacrotextureandwetpavementfriction.TheIFIwasdevelopedinthePIARCInternationalExperimenttoCompareandHarmonizeTextureandSkidResistanceMeasurements.Theindexallowsfortheharmonizingoffrictionmeasurementswithdifferentequipmenttoacommoncalibratedindex.Thispracticeprovidesforharmonizationoffrictionreportingfordevicesthatuseasmoothtreadtesttire.1.2TheIFIconsistsoftwoparametersthatreportthecalibratedwetfrictionat60km/h(F60)andthespeedconstantofwetpavementfriction(Sp).1.3Themeanprofiledepth(MPD)hasbeenshowntobeusefulinpredictingthespeedconstant(gradient)ofwetpavementfriction.1.4Alineartransformationoftheestimatedfrictionat60km/hprovidesthecalibratedF60value.Theestimatedfrictionat60km/hisobtainedbyusingthespeedconstanttocalculatetheestimatedfrictionat60km/hfromameasurementmadeatanyspeed.1.5ThevaluesstatedinSI(metric)unitsaretoberegardedasstandard.Theinch-poundequivalentsarerationalized,ratherthanexactmathematicalconversions.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A42;P66
【国际标准分类号】:93_080_99
【页数】:5P.;A4
【正文语种】: