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1、ARTICLEINPRESSJOURNALOFSOUNDANDVIBRATIONJournalofSoundandVibration321(2009)1171–1185www.elsevier.com/locate/jsviDetectingthecrankshafttorsionalvibrationofdieselenginesforcombustionrelateddiagnosisaa,babP.Charles,JyotiK.Sinha,F.Gu,L.Lidstone,A.D.BallaSchoolofMechanical,AerospaceandCivilEngineeri
2、ng,TheUniversityofManchester,P.O.Box88,ManchesterM601QD,UKbSchoolofComputing&Engineering,UniversityofHuddersfield,Huddersfield,QueensgateHD13DH,UKReceived29May2008;receivedinrevisedform19September2008;accepted28October2008HandlingEditor:C.L.MorfeyAvailableonline19December2008AbstractEarlyfaultdete
3、ctionanddiagnosisformedium-speeddieselenginesisimportanttoensurereliableoperationthroughoutthecourseoftheirservice.Thisworkpresentsaninvestigationofthedieselenginecombustionrelatedfaultdetectioncapabilityofcrankshafttorsionalvibration.Theencodersignal,oftenusedforshaftspeedmeasurement,hasbeenuse
4、dtoconstructtheinstantaneousangularspeed(IAS)waveform,whichactuallyrepresentsthesignatureofthetorsionalvibration.EarlierstudieshaveshownthattheIASsignalanditsfastFouriertransform(FFT)analysisareeffectiveformonitoringengineswithlessthaneightcylinders.Theapplicabilitytomedium-speedengines,however,
5、isstronglycontestedduetothehighnumberofcylindersandlargemomentofinertia.ThereforetheeffectivenessoftheFFT-basedapproachhasfurtherbeenenhancedbyimprovingthesignalprocessingtodeterminetheIASsignalandsubsequentlytestedona16-cylinderengine.Inaddition,anovelmethodofpresentation,basedonthepolarcoordin
6、atesystemoftheIASsignal,hasalsobeenintroduced;toimprovethediscriminationfeaturesofthefaultscomparedtotheFFT-basedapproachoftheIASsignal.Thepaperdiscussestwotypicalexperimentalstudieson16-and20-cylinderengines,withandwithoutfaults,andthediagnosisresultsbytheproposedpolarpresentationmethod.Theresu
7、ltswerealsocomparedwiththeearlierFFT-basedmethodoftheIASsignal.r2008ElsevierLtd.Allrightsreserved.1.IntroductionEarlyfaultdetectionanddiagnosisformedium-speeddieselenginesisimportanttoensurereliableoperationthroughoutthecour
