机械专业论文中英文对照_.doc

机械专业论文中英文对照_.doc

《机械专业论文中英文对照_.doc》由会员分享，可在线阅读，更多相关《机械专业论文中英文对照_.doc（24页珍藏版）》请在冰豆网上搜索。

GearboxNoise

CorrelationwithTransmissionErrorandInfluenceofBearingPreload

DoctoralThesisinMachineDesign

TRITA-MMK2008:

19

ISSN1400-1179

ISRN/KTH/MMK/R-08/19-SE

DepartmentofMachineDesign

RoyalinstituteofTechnology

SE−10044Stockholm,Sweeden

©MatsÅkerblom2008

ABSTRACT

Thefiveappendedpapersalldealwithgearboxnoiseandvibration.Thefirstpaperpresentsareviewofpreviouslypublishedliteratureongearboxnoiseandvibration.

Thesecondpaperdescribesatestrigthatwasspeciallydesignedandbuiltfornoisetestingofgears.Finiteelementanalysiswasusedtopredictthedynamicpropertiesofthetestrig,andexperimentalmodalanalysisofthegearboxhousingwasusedtoverifythetheoreticalpredictionsofnaturalfrequencies.Inthethirdpaper,theinfluenceofgearfinishingmethodandgeardeviationsongearboxnoiseisinvestigatedinwhatisprimarilyanexperimentalstudy.Eleventestgearpairsweremanufacturedusingthreedifferentfinishingmethods.Transmissionerror,whichisconsideredtobeanimportantexcitationmechanismforgearnoise,wasmeasuredaswellaspredicted.Thetestrigwasusedtomeasuregearboxnoiseandvibrationforthedifferenttestgearpairs.Themeasurednoiseandvibrationlevelswerecomparedwiththepredictedandmeasuredtransmissionerror.Mostoftheexperimentalresultscanbeinterpretedintermsofmeasuredandpredictedtransmissionerror.However,itdoesnotseempossibletoidentifyonesingleparameter,suchasmeasuredpeak-to-peaktransmissionerror,thatcanbedirectlyrelatedtomeasurednoiseandvibration.Themeasurementsalsoshowthatdisassemblyandreassemblyofthegearboxwiththesamegearpaircanchangethelevelsofmeasurednoiseandvibrationconsiderably.Thisfindingindicatesthatotherfactorsbesidesthegearsaffectgearnoise.Inthefourthpaper,theinfluenceofbearingendplayorpreloadongearboxnoiseandvibrationisinvestigated.Vibrationmeasurementswerecarriedoutattorquelevelsof140Nmand400Nm,with0.15mmand0mmbearingendplay,andwith0.15mmbearingpreload.Theresultsshowthatthebearingendplayandpreloadinfluencethegearboxvibrations.Withpreloadedbearings,thevibrationsincreaseatspeedsover2000rpmanddecreaseatspeedsbelow2000rpm,comparedwithbearingswithendplay.Finiteelementsimulationsshowthesametendenciesasthemeasurements.Thefifthpaperdescribeshowgearboxnoiseisreducedbyoptimizingthegeargeometryfordecreasedtransmissionerror.Robustnesswithrespecttogeardeviationsandvaryingtorqueisconsideredinordertofindageargeometrygivinglownoiseinanappropriatetorquerangedespitedeviationsfromthenominalgeometryduetomanufacturingtolerances.Staticanddynamictransmissionerror,noise,andhousingvibrationsweremeasured.Thecorrelationbetweendynamictransmissionerror,housingvibrationsandnoisewasinvestigatedinspeedsweepsfrom500to2500rpmatconstanttorque.Nocorrelationwasfoundbetweendynamictransmissionerrorandnoise.Staticloadedtransmissionerrorseemstobecorrelatedwiththeabilityofthegearpairtoexcitevibrationinthegearboxdynamicsystem.

Keywords:

gear,gearbox,noise,vibration,transmissionerror,bearingpreload.

ACKNOWLEDGEMENTS

ThisworkwascarriedoutatVolvoConstructionEquipmentinEskilstunaandattheDepartmentofMachineDesignattheRoyalInstituteofTechnology（KTH）inStockholm.TheworkwasinitiatedbyProfessorJackSamuelsson（VolvoandKTH）,ProfessorSörenAndersson（KTH）,andDr.LarsBråthe（Volvo）.ThefinancialsupportoftheSwedishFoundationforStrategicResearchandtheSwedishAgencyforInnovationSystems–VINNOVA–isgratefullyacknowledged.VolvoConstructionEquipmentisacknowledgedforgivingmetheopportunitytodevotetimetothiswork.ProfessorSörenAnderssonisgratefullyacknowledgedforexcellentguidanceandencouragement.IalsowishtoexpressmyappreciationtomycolleaguesattheDepartmentofMachineDesign,andespeciallytoDr.UlfSellgrenforperformingsimulationsandcontributingtothewritingofPaperD,andDr.StefanBjörklundforperformingsurfacefinishmeasurements.ThecontributionstoPaperCbyDr.MikaelPärssinenarehighlyappreciated.AllcontributionstothisworkbycolleaguesatVolvoaregratefullyappreciated.

1INTRODUCTION

1.1Background

Noiseisincreasinglyconsideredanenvironmentalissue.Thisbeliefisreflectedindemandsforlowernoiselevelsinmanyareasofsociety,includingtheworkingenvironment.Employeesspendalotoftimeinthisenvironmentandnoisecanleadnotonlytohearingimpairmentbutalsotodecreasedabilitytoconcentrate,resultingindecreasedproductivityandanincreasedriskofaccidents.Quality,too,hasbecomeincreasinglyimportant.Thequalityofaproductcanbedefinedasitsabilitytofulfillcustome