Designation:E1215−93(Reapproved2012)StandardSpecificationforTrailersUsedforMeasuringVehicularResponsetoRoadRoughness1ThisstandardisissuedunderthefixeddesignationE1215;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthedesign,performance,andoperatingfeaturesofatrailerusedformeasuringresponsetoroadroughness.1.2Thespecifiedtrailerisatwo-wheeled,single-axleve-hiclethatistowedonhighwaysattypicaltrafficspeedswhiletherelativemovementbetweentheaxleandbodyistransducedandrecordedasanindicationofroadroughness.1.3Theinstrumentationforsensingthemovementsofthetrailerisnotcoveredinthisspecification.OneexampleofinstrumentationisdescribedinTestMethodsE1082.1.4Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.1.5ThefollowingcaveatpertainsonlytoSection5ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E1082TestMethodforMeasurementofVehicularResponsetoTraveledSurfaceRoughnessE1136SpecificationforP195/75R14RadialStandardRefer-enceTestTire2.2OtherDocument:A4082TPCTirePerformanceCriteria,ProceduresandSpecifications33.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1sprungmass—thetotalmassminustheunsprungmass.3.1.2suspensiondeflection—thechangeintheverticaldis-tancebetweentheaxleatitscenterlineandahypotheticalreferencelinedirectlyabovetheaxlecenterlineontherigidframestructure.4.OtherRequirements4.1DampingRatioofSuspensionSystem—Thedampingratioofthesuspensionsystemontheassembledtrailershallbeevaluatedbymeasuringtheaccumulatedsuspensionmovementonthetrailerasitistowedoveraknownorstan...
