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1、AQUICKINTRODUCTIONTOBEARINGENVELOPEANALYSISEricBechhoeferGreenPowerMonitoringSystemsCornwall,VT05752Telephone:(802)377-0160ebechhoefer@gmail.comAbstract:Bearingenvelopeanalysis(BEA)isapowerfultechniqueforthedetectionofbearingfaults.Theimproperselectionoftheen
2、velopewindowfrequencyandwindowbandwidthcanrendertheanalysisineffective.Thiscanreducetheabilitytoperformconditionmonitoringtocorrectlyidentifyadegradedbearing.ThispaperisananalysisofhowBEAworksinthedetectionofdamagebearings.AdescriptionoftheBEAisgiven,methodsf
3、orwindowselection,suchasspectralkurtosis,isdescribed,andexamplealgorithmsaregiventofacilitateexperimentation.Keywords:BearingAnalysis,Envelop,Heterodyne,andConditionMonitoringSystems;INTRODUCTION:Rotatingequipmentingeneralandequipmentsuchaswindturbinesaredepe
4、ndentonatransmissiontoconditionthepowerforusefulwork.Inthecaseofwindturbines,thepowerofahightorque,lowspeedmainrotorshaftisconvertedintoahighspeed,lowtorquegeneratorshaft.Integraltothereliableoperationofthistransmission,arebearings.Reliabilityandavailabilityo
5、fthewindturbineareimprovedifmonitoringtechniquesaredeveloped,whichcandetectwhenadegradingorfaultybearingrequiresmaintenance.Thisistheessenceofconditionmonitoringforbearings.Becausethevibrationsignalsofafaultybearingaresmallcomparedtoshaftorderandgearmeshfrequ
6、ency,detectionoffaultsatthebearingratefrequenciesusingFourieranalysisisdifficult.Faultdetectionatthebasebandfrequenciesofthebearingrateis“Stage1”faultdetection.BearingfaultsdetectedusingthesetypesofanalysisareLateStage;thebearingcanbeclosetocatastrophicfailur
7、e.Attheveryleast,abearinginthisstateisgeneratingmetalwhichcancausedamagetoothercomponentswithinthegearbox.Ultrasonicemissioncandetectbearinginnerandouterraceroughness(a“Stage3”fault),buttheremainingusefullifeofabearingatthisstageisrelativelylongcomparedtotheo
8、veralllifeofthebearing.Bearingenvelopeanalysis(BEA)cantypicallydetectbearingfaults100sifnot1000sofhourspriortowhenitisappropriatetodomaintenance.Itisforthisreasonthatmanyconditionmonitori
