外文翻译--直齿圆柱齿轮啮合过程中的声发射源 英文版.pdf

DGZFPPROCEEDINGSBB90CDLECTURE46EWGAE2004469THESOURCEOFACOUSTICEMISSIONDURINGMESHINGOFSPURGEARSCHEEKEONGTAN,DAVIDMBASCHOOLOFENGINEERING,CRANFIELDUNIVERSITY,BEDFORDSHIREMK430AL,UKTEL4401234754681,FAX4401234751566EMAILCKTANCRANFIELDACUKANDDMBACRANFIELDACUKABSTRACTCONDITIONMONITORINGOFGEARSWITHVIBRATIONANALYSISANDSPECTROMETRICOILANALYSISPROGRAMSSOAPAREWIDELYACCEPTEDANDUSEDINTHEMILITARYAVIATIONINDUSTRYWHILSTTHELITERATURETODATEHASSHOWNTHEAPPLICATIONOFTHEACOUSTICEMISSIONAETECHNIQUETOGEARBOXHEALTHMONITORINGSTILLBEINITSINFANCY,THEREEXISTOPPORTUNITIESTODEVELOPTHETECHNIQUEINTOACOMPLEMENTARYDIAGNOSTICTOOLINDEVELOPINGSUCHATOOL,ITISIMPERATIVETHATANUNDERSTANDINGOFTHESOURCEOFAEACTIVITYISESTABLISHEDTHISPAPERPRESENTSEXPERIMENTALRESULTSTHATEXPLORETHEAESOURCEDURINGAGEARMESHANDHASLEDTOQUITEUNIQUEANDSIGNIFICANTOBSERVATIONSKEYWORDACOUSTICEMISSION,ASPERITYCONTACT,CONDITIONMONITORING,GEARDEFECTDIAGNOSIS,MACHINEHEALTHMONITORING,ROLLINGFRICTION,SLIDINGFRICTIONLITERATUREREVIEWSAPPLICATIONOFVIBRATIONANALYSISTOGEARFAULTDIAGNOSISANDMONITORINGHASBEENWIDELYINVESTIGATEDANDITSUSAGEININDUSTRYISWELLESTABLISHEDTHISISPARTICULARLYREFLECTEDINTHEAVIATIONINDUSTRYWHEREHELICOPTERENGINES,TRANSMISSIONSYSTEMS,DRIVETRAINSANDROTORSYSTEMSHAVEADOPTEDVIBRATIONANALYSISFORHEALTHMONITORINGHOWEVER,RESEARCHINTHEAPPLICATIONOFAETOGEARFAULTDETECTIONANDMONITORINGISLIMITEDTHEMOSTCOMMONFAILURESENCOUNTEREDINOPERATIONALGEARBOXESINCLUDEMICROPITTING,PITTING,SCUFFINGANDABRASIVEWEARALTHOUGHTOOTHFRACTUREANDBENDINGFATIGUEARERARE,THECRITICALITYOFSUCHAFAILUREHASDRAWNHUGEATTENTIONFROMRESEARCHERSINEXAMINATIONOFTHEAETECHNIQUEONTHESEFAILUREMODES,MOSTRESEARCHERSHAVEOPTEDFORSIMULATEDPITDEFECTSSINGH1,2,TANDON3ANDSIORES4PERFORMEDTHEIREXPERIMENTSUSINGSIMULATEDPITS,WHILSTTOUTOUNTZAKIS5,SENTOKU6ANDMIYACHIKA7ALLOWEDNATURALDEFECTSSUCHASPITTINGTOOCCURDURINGTHETESTSTHECONCLUSIONDRAWNFROMALLTHESEEXPERIMENTSWEREENCOURAGING；AETECHNIQUEWASABLETODETECTBOTHSEEDEDANDNATURALDEFECTSAMONGTHESERESEARCHERS,ONLYTOUTOUNTZAKISANDSENTOKUEMPLOYEDASLIPRINGTOTRANSMITTHEAEDATAFROMTHEROTATINGAESENSORTOTHEACQUISITIONSYSTEMS,THEREBYOFFERINGADIRECTTRANSMISSIONPATHOTHERSMOUNTEDTHEIRAESENSORSONTHEBEARINGORGEARBOXCASINGAND,CLAIMEDSUCCESSFULIDENTIFICATIONOFDEFECTIVEGEARSTHEPAPERSREVIEWEDHAVEILLUSTRATEDTHEPOTENTIALANDVIABILITYOFTHEAETECHNIQUEINBECOMINGAUSEFULDIAGNOSTICTOOLINCONDITIONMONITORINGOFGEARSHOWEVER,NONEHAVEDGZFPPROCEEDINGSBB90CDLECTURE46EWGAE2004470INVESTIGATEDTHESOURCEOFAEACTIVITYDURINGTHEGEARMESHANUNDERSTANDINGOFTHEFUNDAMENTALAESOURCEMECHANISMINMESHINGGEARSISOFVITALIMPORTANCEINDEVELOPINGTHISTECHNIQUEOBSERVATIONOFAEBURSTSDURINGGEARMESHAEDATAWASRECORDEDDURINGSIMULATEDDEFECTGEARTESTSANINTERESTINGOBSERVATIONWASTHEAETRANSIENTSASSOCIATEDWITHTHEGEARMESHWITHASAMPLINGRATEOF10MHZANDROTATIONALSPEEDOFAPPROXIMATELY742RPM,ONLY16MESHINGTEETHSIGNATURESWERERECORDEDPERACQUISITIONWINDOWFIGURE1SHOWSTHETIMEDOMAINOFANAESIGNATURERECORDEDDURINGTHETESTSUNDERTWODIFFERENTLOADCONDITIONSCLEARLYSHOWINGTHEAETRANSIENTRESPONSEASSOCIATEDWITHGEARMESHINGOF16TEETHTHISAETRANSIENTRESPONSELEDTHEAUTHORSTOINVESTIGATETHEPOSSIBLESOURCEOFAEACTIVITYDUETOTHEMESHINGGEARTHERESULTSPRESENTEDWEREACQUIREDFROMTHEAESENSORMOUNTEDONTHEPINIONWHEELANDAEDATAWASCAPTUREDWITHACOMMERCIALDATAACQUISITIONCARDPACVIAASLIPRING000050010015002002501005000501AMPLITUDEVTIMESECONDS000050010015002002501005000501TIMESECONDSAMPLITUDEVFIGURE1TIMEDOMAINOFANAESIGNATURESHOWINGCLEARLYTHEAETRANSIENTRESPONSEASSOCIATEDWITHGEARMESHINGOF16TEETHFORTHEROTATIONALSPEEDOF745RPMUNDERVARIOUSLOADSPREAMPLIFICATION20DBAESOURCEMECHANISMSFROMTHEOBSERVATIONSPRESENTEDTHUSFAR,THEAUTHORSBELIEVETHEREARETHREEPOSSIBLESOURCESOFAEACTIVITYDURINGTHEGEARMESHTOOTHRESONANCE,SECONDARYPRESSUREPEAKINLUBRICATEDGEARSAND/ORASPERITYCONTACTSDGZFPPROCEEDINGSBB90CDLECTURE46EWGAE2004471TOOTHRESONANCEESTIMATIONOFTHETOOTHRESONANCEFREQUENCYWASACCOMPLISHEDBYMODELLINGTHEGEARTOOTHASCANTILEVERBEAMANDSPRINGMASSSYSTEMBASEDONTHEGEARTOOTHGEOMETRY,LOADINGCONDITIONSANDONTHEASSUMPTIONTHATTHELOADISTRANSMITTEDALONGTHEPITCHLINE,THETOOTHRESONANCEFREQUENCYWASCALCULATEDAT75KHZTHISISBELOWTHEFREQUENCYRANGE100TO1200KHZOFTHEAESENSOREMPLOYEDINACTUALGEARSYSTEMS,ALOWERMOMENTOFINERTIAWOULDBEEXPECTEDRESULTINGINALOWERNATURALFREQUENCYTHANTHATCALCULATEDTHISELIMINATEDGEARTOOTHRESONANCEASASOURCEOFAEACTIVITYDURINGGEARMESHSECONDARYPRESSUREPEAKINTHELUBRICANTTHEOTHERPOSSIBLESOURCEOFAEMECHANISMINTHEMESHINGGEARSCOULDOCCURASARESULTOFTHEPRESSUREDISTRIBUTIONBETWEENTHEGEARTEETHSURFACESANDTHELUBRICATINGOILFILMTHISPRESSUREDISTRIBUTIONISSTRONGLYINFLUENCEDBYTHEGEAROPERATINGCONDITIONSSUCHASLOAD,SPEEDANDMATERIALPROPERTIES,ASDEPICTEDINFIGURE29FROMTHISFIGURE,THEOCCURRENCEOFALOCALPRESSUREPEAKFARINEXCESSOFTHEHERTZAINMAXIMUMISOBSERVEDTHISHASTHEEFFECTOFREDUCINGTHEFILMTHICKNESSATTHEPOSITIONOFTHESECONDARYPRESSUREPEAKTHEDECREASEINFILMTHICKNESSATTHISPARTICULARPOSITIONCANBEABRUPT,DEPENDINGONTHESURFACEVELOCITYTHISSUDDENINCREASEINPRESSUREORDECREASEINFILMTHICKNESSCOULDBEASOURCEOFAEACTIVITYALTHOUGHTHEAUTHORSCANNOTPROVETHISATPRESENTITMAYBEWORTHNOTINGTHATLOADHASNOINFLUENCEONTHEFILMTHICKNESSORLEVELOFS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