利用Ansys对Eicher1110底盘车架进行分析与验证外文文献翻译中英文翻译外文翻译.docx

利用Ansys对Eicher1110底盘车架进行分析与验证外文文献翻译中英文翻译外文翻译.docx

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利用Ansys对Eicher1110底盘车架进行分析与验证外文文献翻译中英文翻译外文翻译

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IndiaInternationalJournalofEmergingTrends&TechnologyinComputerScience（IJETTCS）

WebSite:

www.ijettcs.orgEmail:

editor@ijettcs.org,editorijettcs@

Volume2,Issue2,March–April2013ISSN2278-6856

AnalysisandvalidationofEicher11.10chassisframeusingAnsys

.TusharM.Patel1,Dr.M.G.Bhatt2andHarshadK.Patel3

1ResearchScholar,MewarUniversity,Gangrar,Rajasthan,India.

2AssociateProfessor,SSEC,Bhavnagar,Gujarat,India

3MEScholar,LDRP-ITR,Gandhinagar,Gujarat,

Abstract:

Truckchassisisthestructuralbackboneofanyvehicle.Themainfunctionofthetruckchassisistosupportthecomponentsandpayloadplaceduponit.Thechassisframehastowithstandthestressesdevelopedaswellasdeformationoccursinitandthatshouldbewithinalimit.ThispaperpresentsthestudyofthestressdevelopedinchassisanddeformationofchassisframeofEICHER11.10.ThestressanddeformationhasbeencalculatedforthechassisframeandtheFEanalysishasbeendoneforthevalidationonthechassisframemodel.Themodelofthechassishasbeendevelopedinsolidworks2009andstaticstructuralanalysishasbeendoneinANSYSworkbench.

Keywords:

FEA,TruckChassis,StructuralAnalysis,LadderFrame

1.INTRODUCTION

Automobilechassisusuallyreferstothelowerbodyofthevehicleincludingthetires,engine,frame,drivelineandsuspension.Outofthese,theframeprovidesnecessarysupporttothevehiclecomponentsplacedonit.Alsotheframeshouldbestrongenoughtowithstandshock,twist,vibrationsandotherstresses.Thechassisframeconsistsofsidemembersattachedwithaseriesofcrossmembers.Alongwiththestrength,animportantconsiderationinthechassisdesignistoincreasethestiffness（bendingandtorsion）characteristics.Adequatetorsionalstiffnessisrequiredtohavegoodhandlingcharacteristics.Normallythechassisaredesignedonthebasisofstrengthandstiffness.Intheconventionaldesignprocedurethedesignisbasedonthestrengthandemphasisisthengiventoincreasethestiffnessofthechassis,withverylittleconsiderationtotheweightofthechassis.Onesuchdesignprocedureinvolvestheaddingofstructuralcrossmembertotheexistingchassistoincreaseitstorsionalstiffness.Asaresultweightofthechassisincreases.Thisincreaseinweightreducesthefuelefficiencyandincreasesthecostduetoextramaterial.Thedesignofthechassiswithadequatestiffnessandstrengthisnecessary.

2、LITERATUREREVIEW

Manyresearchershadconductedanalysisonchassisofvariousheavyvehicles.Thedynamiccharacteristicsoftruckchassissuchasthenaturalfrequencyandmodeshapeweredeterminedusingfiniteelementmethod.ExperimentalmodalanalysiswascarriedouttovalidatetheFEmodels[2].VijayPateletal.performedthestaticstructuralanalysisofthetruckchassis.Structuralsystemsofthechassiscanbeeasilyanalyzedusingthefiniteelementtechniques.Soaproperfiniteelementmodelofthechassishasbeendeveloped.ThechassiswasmodeledinPRO-E.FEAwasdoneonthemodeledchassisusingtheANSYSWorkbench.Thehigheststressproducewas106.08MPabyFEanalysis.Thecalculatedmaximumshearstresswas95.43Mpa.TheresultofFEanalysiswas10%biggerthantheresultofanalyticalcalculation.Themaximumdisplacementofnumericalsimulationresultwas3.0294mm.Theresultofnumericalsimulationwas5.92%biggerthantheresultofanalyticalcalculationwhichis2.85mm.Thedifferencewascausedbysimplificationofmodelanduncertaintiesofnumericalcalculation[3].AbdRahmanetal.investigatedstressanalysisonaheavy-dutytruckchassisusingfiniteelementmethod.Finiteelementresulthadshownthatthecriticalpointofstressoccursatopeningofchassiswhichwasincontacttothebolt.Thusitwasimportanttoreducestressmagnitudeatthespecificlocation.PreviousFEAagreewiththemaximumdeflectionofsimplebeamloadedbyuniformlydistributedforce[4].Ebrahimietal.constructedahaytrailermodelanditscomponentsanalysiswascarriedout[5].Saneetal.performedstressanalysisonalightcommercialvehiclechassisusingiterativeprocedureforreductionofstresslevelatcriticallocations[6].Koszalkaetal.accomplishedstressanalysisonaframeofsemilowloaderusingFEM.Twoversionsofframedesignwereanalyzed,focusingonthepartofbeamwherethehigheststresseswerelocated[7].

3、FINITEELEMENTANALYSIS

3.1、BasicConceptofFEM

Thefiniteelementmethod（FEM）isacomputationaltechniqueusedtoobtainapproximatesolutionsofboundaryvalueproblemsinengineering.Simplystated,aboundaryvalueproblemisamathematicalprobleminwhichoneormoredependentvariablesmustsatisfyadifferentialequationeverywherewithinaknowndomainofindependentvariablesandsatisfyspecificconditionsontheboundaryofthedomain.

AnunsophisticateddescriptionoftheFEmethodisthatitinvolvescuttingastructureintoseveralelements（piecesofstructure）,describingthebehaviorofeachelementinasimpleway,thenreconnectingelementsatnodesasifnodeswerepinsordropsofgluethatholdelementstogether（Figure1）.Thisprocessresultsinasetofsimultaneousalgebraicequations.Instressanalysistheseequationareequilibriumequationsofthenodes.Theremaybeseveralhundredorseveralthousandsuchequations,whichmeanthatcomputerimplementationismandatory.

Figure1:

Discretizationofmodel[4]

3.2、AGeneralProcedureforFEA。

Therearethreemainsteps,namely:

preprocessing,solutionandpostprocessing.Inpreprocessing（modeldefinition）includes:

definethegeometricdomainoftheproblem,theelementtype（s）tobeused,thematerialpropertiesoftheelements,thegeometricpropertiesoftheelements（length,area,andthelike）,theelementconnectivity（meshthemodel）,thephysicalconstraints（boundaryconditions）andtheloadings.

Insolutionincludes:

thegoverningalgebraicequationsinmatrixformandcomputestheunknownvaluesoftheprimaryfieldvariable（s）areassembled.Thecomputedresultsarethenusedbybacksubstitutiontodetermineadditional,derivedvariables,suchasreactionforces,elementstressesandheatflow.Actuallythefeaturesinthisstepsuchasmatrixmanipulation,numericalintegrationandequationsolvingarecarriedoutautomaticallybycommercialsoftware.

Inpostprocessing,theanalysisandevaluationoftheresultisconductedinthisstep.Examplesofoperationsthatcanbeaccomplishedincludesortelementstressesinorderofmagnitude,checkequilibrium,calculatefactorsofsafety,plotdeformedstructuralshape,animatedynamicmodelbehaviorandproducecolor-codedtemperatureplots.Thelargesoftwarehasapreprocessor

andpostprocessortoaccompanytheanalysisportionandthebothprocessorcancommunicatewiththeotherlargeprograms.Specificproceduresofpreandpostaredifferentdependentupontheprogram。

4、MODELINGOFEXISTINGCHASSISFRAME

.Themodelofexistingchassisasperthedimensioniscreatedinsolidworks2009asshownonFigure2.ThemodelisthensavedinIGESformatwhichcanbedirectlyimportedintoANSYSworkbench.Figure3showstheimportedmodelinANSYSworkbench.

.

Figure2:

CADmodelofchassisinsolidworks2009

Figure3:

GeometryofchassisframeinAnsys

4.1.MaterialofModel

Fortheframegeometryofchassisgenerallysteelanditsalloysareused.Fortheframemodels,varietyofmaterials,compositematerialsanddifferentkindofalloyscanbeused.Inthepresentstudy,ST52isusedanditspropertiesareasgivenbelow.

Table1:

Materialpropertiesofchassis[1]

MaterialST52

ModulusofElasticityE2x105N/mm2

PossionRatio0.3

TensileStrength520N/mm2

YieldStrength360N/mm2

4.2.ConnectionType

Theconnectiontypebetweenthesidebars,bracketandcrossbarcanbewelded,rivetedoritcanbebolted.NormallyrivetedjointisusedsoheretherivetedconnectionisdefinedinmodelingasshowninFigure4.2

Figure4:

Connectiontypeofchassisframe

4.3MeshingofChassisFrame

Themeshingisdoneonthemodelwith85466No.Ofnodesand38369No.ofTetrahedralelements.Figures5and6showtetrahedralelementandmeshingofmodel。

Figure5:

Tennodetetrahedralelement

Figure6:

Meshingofchassisframe

4.4.LoadingConditionofChassisFrame

Thetruckchassismodelisloadedbystaticforcesfromthetruckbodyandload.Forthismodel,themaximumloadedweightoftruckandbodyis10,000kg.Theloadisassumedasauniformdistributedobtainedfromthemaximumloadedweightdividedbythetotallengthofchassisframe.DetailloadingofmodelisshowninFigure7and8.Themagnitudeofforceontheuppersideofchassisis117720Nwhichiscarriedbytwosidebarssoloadononesidebaris58860N.

Figure7:

Loadonfirstsidebarofchassisframe

Figure8:

Loadonsecondsidebarofchassisframe

5、RESULTOFANALYSIS

Figure9:

Flowchartforvalidation

Theanalysisdoneonthechassismodelgivesthemaximumgeneratedshearstressvalue100.13KN（figure11）.Basedonstaticsafetyfactortheory,themagnitudeofsafetyfactorforthisstructureis1.43[4].Theformulaofdesignstressisdefinedby[1]

DesignStress=YieldStress/FactorofSafety

J.P.Vidosicrecommendssomevalueofsafetyfactorforvariousconditionofloadingandmaterialofstructures.Thevalueof1.5to2forwellknownmaterialsunderreasonablyenvironmentalcondition,subjectedtoloadsandstressesthatcanbedeterminedreadily.Basedonthisresult,itisnecessarytoreducethestressmagnitudeofcriticalpointinordertogetthesatisfySFvalueoftruckchassis.Thetruckcha