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1、NorthAmericanTestProcedureGMN5811TPENGINEERINGSTANDARDS(Book)FrontFrameTorsionalStaticStiffnessEvaluationProcedure1Introduction3ResourcesTheFrameStaticStiffnessMasterProcedureGMN5801TP,shallbereferencedfordetailed3.1Facilities.ALargeBedplate.informationcorres
2、pondingtothefollowingprocedure.3.2Equipment.Sphericalbearings,elephant’sfeet,forceringtransducers,dialindicators,1.1Purpose.Todeterminethefrontframewedgeblocks,threadedrod/nuts,referencebar.torsionalstaticstiffnessoftheframefromafull-framevehicle.3.3TestVehic
3、le/TestPiece.AFrameincludingbolt-onhardware(e.g.bumpers).1.2Foreword.Thetorsionalstiffnessofthefrontframeisanimportantfactorinthelevelof3.4TestTime.on-roadshakeexperiencedbytheoccupantsofCalendartime:1dayafull-framevehicle.HightorsionalstiffnessinTesthours:3h
4、oursthisareaalsoprovidesasolidfoundationfortheCoordinationhours:5hourspowertrain,frontsuspensionandsteeringsystem,whichsimplifiesthetuningofthe3.5TestRequiredInformation.Mayrequiremountsforthosecomponents.Framestaticfabricationforloadapplicationinterface.stif
5、fnessmetricsareintendedasanimprovementoverthepreviouspracticeof4Procedurespecifyingfree-freeframemodefrequencies,4.1Preparation.whichhavenotbeenshowntorelatetofullvehicleperformance.4.1.1Calibrateforceringtransducers.1.3Applicability.FramesfromGMand4.1.2Bound
6、aryConditions:Constraintheframecompetitivefull-framevehicles.atthe#1and#2bodymountbracketsonbothsides.SeeAppendixA,Figure1.1.4Definitions.RefertotheFrameStaticStiffnessMasterProcedureGMN5801TP.4.2Conditions.2References4.2.1EnvironmentalConditions.N/A2.1Normat
7、ive.N/A4.2.2TestConditions.Deviationsfromthe2.2GM.requirementsofthistestprocedureshallhavebeenagreedupon.SuchrequirementsshallbeGMN5801TPFrameStaticStiffnessMasterspecifiedoncomponentdrawings,testProcedurecertificates,reports,etc.Elzinga,D.R.“ResultsofGMT800P
8、ickupTruckFrontFrameStructureDevelopmentProject,“4.3Instructions.NVCinter-organizationmemo,August31,1998.©CopyrightDateGeneralMotorsCorporationAllRightsReservedOriginatedDate:05SE01GMN581
