【英文标准名称】:StandardPracticeforCalibrationofSystemsUsedforMeasuringVehicularResponsetoPavementRoughness
【原文标准名称】:道路粗糙度对车辆影响的测量系统的校正的标准方法
【标准号】:ASTME1448/E1448M-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:E17.31
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:calibration;response-typesystem;roadroughness;Calibration--pavementtestinganalysisinstrumentation;Passengercars;Responsefactors;Roadroughness
【摘要】:Measuresobtainedbyaresponse-typesystemdependprimarilyonthevehicledesignandcondition,theload,themeasuringspeed,andahostofenvironmentalconditions.Evenwithcontrolofallsignificantvariables,theresponseofeveryvehicleisunique.Thus,rawmeasuresfromsuchasystemarenotreproduciblewithothersystems.Thecalibrationdescribedinthispracticeprovidesamethodforconvertingtherawoutputofaparticularresponse-typesystemtoareproduciblestandardroughnessscale.Theresponseofavehicletoroadroughnessisacomplexphenomenonthatcannotbesummarizedinalaboratorytest.Therefore,thecalibrationismadethroughcorrelationwithstandardroughnessindexvaluesestablishedforcalibrationsitessituatedonrepresentativeroads.ThedatafromthecalibrationsitesareanalyzedtodetermineanequationtoestimatethestandardroughnessindexfromanRTSN.TheestimateofthestandardroughnessindexmadebytransforminganRTSNissubjecttothreetypesoferror:RandomErroroftheResponse-Type-System(Repeatability)8212;Thiserrorincludesoperatorerrorandvariabilityintheresponseofthevehicleandothercomponentsoftheresponse-typesystem.Itcanbereducedbyperformingrepeatedmeasurementswiththeresponse-typesystemandaveragingtheindividualmeasurementstoestimatethetrueRTSNforasite.AppendixX1describesatestmethodfordeterminingthemagnitudeofin-userepeatabilityerror.Note18212;Thelengthofthesiteorsitesusedtoestimatein-userepeatabilityshallbeequaltotheminimumlengthofthetestsectionstobesurveyedbytheresponse-typesystem.Thismayrequiretestsitesthatarelongerthanthoseprofiledforthecalibration.BiasErrorintheCalibrationEquation8212;Estimatesofthestandardroughnessindexarebiasedifthecalibrationequationisincorrectorifnocalibrationequationisused.Thepurposeofthisstandardpracticeistoreducebiastoanegligiblelevel.Ifdesired,themagnitudeofbiasremainingaftercalibrationcanbeestimatedfromdatacollectedinthecalibration.StandardErroroftheEstimate(ErrorDuetoInteractionsBetweenSiteEffectsandResponse-TypeSystemEffects)8212;Thiserrorisconstant(abias)foraparticularcombinationofresponse-typesystemandsite,butitisrandomwithsiteselection.Ultimatelyitlimitstheaccuracyoftheestimateofthestandardroughnessofasitemadewitharesponse-typesystem.Theerrorcanbeestimatedfromdatacollectedinthecalibration.Thestandarderroroftheestimateestimatestheerrorduetophysicaldifferencesinresponsebetweenaparticularresponse-typesystemandthestandardroughnessindex.Itcannotbereducedbyamathematicaltransform.Threephysicalvariablesthatarecontrollableandthatinfluencethestandarderroroftheestimatearevehicletestspeed,shockabsorberdampingstiffness,andvehicletirepressure.Formostvehicles,maximumreproducibilityofstandardroughnessindexestimatesisobtainedbyadoptingatestspeedof80km/h[50mph],byequippingthevehiclewithstiffshockabsorbers,andbymaintainingastandardtirepressure.(Seealso8.2.)Periodicverificationisessentialtoensurethatthecalibrationremainsvalid.1.1Thispracticedescribesequipmentandproceduresforthecalibrationofsystemsusedformeasuringvehicularresponsetopavementroughness.Suchsystemsarereferredtoasresponse-typesystems.(SeeTestMethodE1082.)1.2Theresponse-typesystemincl......
【中国标准分类号】:R86
【国际标准分类号】:93_080_20
【页数】:9P.;A4
【正文语种】:英语