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1、2007-01-2335AParametricApproachForVehicleFrameStructureDynamicsAnalysisSung-PingCheng,AnningChenandMilesJanickiFordMotorCompanyABSTRACTThecapabilitytodriveNVHqualityintovehicleframedesignisoftencompromisedbythelackofavailablepredictivetoolsthatcanbedevelopedandappliedwithinth
2、etimeframeduringwhichkeyarchitecturaldesigndecisionsarerequiredtoaddressthisneedanewparametricframemodelingapproachwasdevelopedandispresentedinthispaper.Thisfullyparameterizedmodeliscapableoffastmodalstaticstiffness&weightassessments,aswellasDSA/optimizationforframedesignchan
3、ges.Thistoolhasbeenproventobeeffectiveinimprovingspeed,qualityandimpactofNVHhardwaredecisions.INTRODUCTIONThedynamiccharacteristicofavehicleframestructureplaysasignificantroleinvehicleNVH(Noise,VibrationandHarshness)performance,anddirectlyaffectstheoverallcustomersatisfaction
4、.Thepredictionofframedynamicbehaviorsbecomesverycrucialtoensurebody/framemodalseparationandpreventvehicleshakeandvibration.Forthispurpose,severalCAEmethodshavebeenappliedtoframestructuralanalysis;therearefiniteelementbasedmodels[1],[2],andtheboundaryelementbasedmodel[3].Themo
5、stofthesemodelsarecomplicatedhavingaverylargemodelsize.Theengineeringresourcerequirementofmodelbuildingandanalysis,plustherequirementofdetaileddesigninformation,oftenmeanthattheycannotbeappliedinatimeframeformaximumefficiencyandeffectiveness,intheconceptualdesignstage.Tooverc
6、omethesechallenges,anewParametricFrameModel(PFM)hasbeendevelopedandpresentedinthispaper.Thismodel,asillustratedinFigure1,isalinearfiniteelementmodeldefinedonparameterizedgeometry.Whenthegeometrychanged,thefiniteelementmodelcanbeupdatedautomatically.Itiscapableofprovidingfastm
7、odal,staticstiffness,andweightassessments,aswellasDSA/optimizationforframedesignchanges.Thisfullyparameterizedmodelincludesmostoftheimportantdesignvariablesofvehicleframearchitectureandgeometry,allowingeasychangestotheshapeanddimensionsofanysection.Regardlessofthenumberofvari
8、ablechanges,thisparametricframemodelcanbeupdatedandcanrecalculatethe
