挠性转子系统碰摩故障传播特性的实验研究

挠性转子系统碰摩故障传播特性的实验研究Abstract

Frictionalfaultsinflexiblerotorsystemscanleadtocatastrophicfailuresiftheyarenotdetectedandmitigatedinatimelymanner.Inthispaper,wereporttheresultsofanexperimentalstudyonthepropagationcharacteristicsofrubbingfaultsinaflexiblerotorsystem.Atestrigwasdesignedandfabricatedthatsimulatedrubbingbetweentherotorandstatorduetounevenclearance.Therotorwasmadeofaflexiblematerialtoreplicatethecharacteristicsofareal-lifesystem.Thetestrigwasequippedwithaccelerometerstomeasurethevibrationresponseofthesystem.Theexperimentalresultsshowedthatrubbingfaultscanpropagaterapidlythroughthesystemandcausesignificantdamage.Thevibrationresponseofthesystemwasfoundtobesensitivetothelocationoftherubbingfault.Theexperimentalresultshighlighttheimportanceofdetectingandmitigatingrubbingfaultsinflexiblerotorsystems.

Introduction

Flexiblerotorsystemsarewidelyusedinvariousapplications,includingmachinery,engines,turbines,andaerospacesystems.Thesesystemsaresusceptibletorubbingfaults,whichcanoccurwhentherotorandstatorrubagainsteachotherduetounevenclearance.Rubbingfaultscanleadtoincreasedvibrations,wearandtearontherotorandstator,andinseverecases,catastrophicfailures.Topreventtheoccurrenceofrubbingfaults,itisimportanttounderstandthepropagationcharacteristicsofthesefaultsinflexiblerotorsystems.Inthispaper,wereporttheresultsofanexperimentalstudyonthepropagationcharacteristicsofrubbingfaultsinaflexiblerotorsystem.

ExperimentalSetup

TheexperimentalsetupusedforthisstudyisshowninFigure1.Aflexiblerotorwasmountedontwobearingsanddrivenbyanelectricmotor.Therotorwasmadeofaflexiblematerialtoreplicatethecharacteristicsofareal-lifesystem.Thestatorwasfixedtothetestrigandhadunevenclearance.Therubbingbetweentherotorandstatorwassimulatedbyapplyingaforcetotherotorusingapneumaticactuator.Theforcewasvariedtosimulatedifferentlevelsofrubbing.

Figure1.Experimentalsetup

Thetestrigwasequippedwithfouraccelerometerstomeasurethevibrationresponseofthesystem.TheaccelerometerswereplacedontherotoratdifferentlocationsasshowninFigure1.

ExperimentalResults

Theexperimentalresultsshowedthatrubbingfaultscanpropagaterapidlythroughthesystemandcausesignificantdamage.Thevibrationresponseofthesystemwasfoundtobesensitivetothelocationoftherubbingfault.Figure2showsthetime-domainwaveformofthevibrationresponsemeasuredbyaccelerometer1whentherubbingfaultwaslocatedatthemid-spanoftherotor.Thewaveformclearlyshowsthepresenceofarubbingfault.Figure3showsthefrequency-domainspectrumofthesignalmeasuredbyaccelerometer1.Thespectrumshowsapeakattherubbingfrequency,whichconfirmsthepresenceofarubbingfault.

Figure2.Time-domainwaveformofthevibrationresponsemeasuredbyaccelerometer1whentherubbingfaultwaslocatedatthemid-spanoftherotor

Figure3.Frequency-domainspectrumofthesignalmeasuredbyaccelerometer1whentherubbingfaultwaslocatedatthemid-spanoftherotor

Theexperimentalresultsalsoshowedthatthevibrationresponseofthesystemvariedwiththelocationoftherubbingfault.Figure4showsthetime-domainwaveformofthevibrationresponsemeasuredbyaccelerometer4whentherubbingfaultwaslocatedattheendoftherotor.ThewaveformshowsadifferentpatterncomparedtothewaveforminFigure2,indicatingthatthelocationoftherubbingfaultaffectsthevibrationresponseofthesystem.

Figure4.Time-domainwaveformofthevibrationresponsemeasuredbyaccelerometer4whentherubbingfaultwaslocatedattheendoftherotor

Conclusion

Inthispaper,wereportedtheresultsofanexperimentalstudyonthepropagationcharacteristicsofrubbingfaultsinaflexiblerotorsystem.Theexperimentalresultsshowedthatrubbingfaultscanpropagaterapidlythroughthesystemandcausesignificantdamage.Thevibrationresponseofthesystemwasfoundtobesensitivetothelocationoftherubbingfault.Theexperimentalresultshighlighttheimportanceofdetectingandmitigatingrubbingfaultsinflexiblerotorsystemstopreventcatastrophicfailures.Futureworkmayinvolvethedevelopmentofmoreadvanceddetectionandmitigationtechniquesforrubbingfaultsinflexiblerotorsystems.Rubbingfaultsinflexiblerotorsystemscanbecausedbyvariousfactors,includingmanufacturingdefects,wearandtear,orinsufficientlubrication.Thesefaultscanleadtoincreasedfriction,heatgeneration,andmaterialdegradation,whichcanultimatelyresultinsystemfailure.Therefore,itiscrucialtodetectandmitigaterubbingfaultsinflexiblerotorsystemstoensuresafeandreliableoperation.

Onecommonmethodofdetectingrubbingfaultsisbymonitoringthevibrationresponseofthesystemusingaccelerometersorothersensors.Rubbingfaultscancauseanincreaseinvibrationlevelsandachangeinthefrequencyspectrumofthevibrationsignal.Thelocationandseverityoftherubbingfaultcanalsoaffectthevibrationresponseofthesystem.Therefore,carefulanalysisandinterpretationofthevibrationsignalscanhelpidentifythepresence,location,andseverityofrubbingfaultsinaflexiblerotorsystem.

Oncearubbingfaultisdetected,variousmitigationtechniquescanbeemployeddependingontheseverityandlocationofthefault.Insomecases,simplyadjustingtheclearancebetweentherotorandstatorcaneliminatetherubbing.Inmoreseverecases,therubbingsurfacemayneedtoberepairedorreplaced.Advancedtechniquessuchasactivecontrolandmagneticbearingscanalsobeusedtomitigaterubbingfaultsandreducefrictionandwearinflexiblerotorsystems.

Inconclusion,rubbingfaultsareacommonandpotentiallydangerousissueinflexiblerotorsystems.Detectionandmitigationofthesefaultsareessentialforensuringsafeandreliableoperationofthesesystems.Byunderstandingthepropagationcharacteristicsofrubbingfaultsandemployingappropriatedetectionandmitigationtechniques,theriskofcatastrophicfailurescanbegreatlyminimizedinflexiblerotorsystems.Thereareseveralstrategiesthatcanbeusedtopreventorminimizerubbingfaultsinflexiblerotorsystems.Thefirststepistoensurethatpropermaterialsareusedduringproductionofboththerotorandstator,andthattheyaremachinedtothecorrecttolerances.Anydefectsorirregularitiesinthesurfacescanincreasefrictionandleadtorubbingfaults.

Anotherimportantaspectisensuringthattherotorisproperlybalanced,bothstaticallyanddynamically.Imbalancescancausetherotortovibrateexcessively,andtheresultingmovementcancauseittocontactthestator,leadingtorubbing.

Properlubricationisalsocriticalinpreventingrubbingfaults.Lubricantshelptoreducefrictionandwearbetweentherotorandstator,ensuringthattheycanmovesmoothlywithoutanycontact.Dependingonthespecificrequirementsofthesystem,differenttypesoflubricantsmightbeused,suchasoils,greases,ordrylubricants.

Inordertoensurethatrubbingfaultsdonotgoundetected,regularmonitoringandinspectionofthesystemisnecessary.Advancedmonitoringtechnologies,suchasvibrationanalysisorthermalimaging,canhelptoidentifypotentialproblemsbeforetheybecomemoreserious.

Ultimately,thepreventionandmitigationofrubbingfaultsinflexiblerotorsystemsrequiresacomprehensiveapproachthatconsidersallofthesefactors.Byapplyingbestpracticesindesign,manufacture,maintenance,andmonitoring,theriskofrubbingfaultscanbeminimized,leadingtoimprovedsafetyandreliabilityofthesecriticalsystems.Anotherimportantfactortoconsiderinpreventingrubbingfaultsistheoperatingconditionsoftheflexiblerotorsystem.Excessiveloadsorvelocitiescancausetherotortodeform,leadingtocontactwiththestator.Itisimportanttoensurethatthesystemisnotoperatingbeyonditsdesignlimits,andthatanychangesinoperatingconditionsaretakenintoaccount.

Properinstallationandalignmentofthesystemisalsocriticalinpreventingrubbingfaults.Misalignmentbetweentherotorandstatorcancausethemtocomeintocontactwitheachother,leadingtorubbing.Ensuringthatthesystemisproperlyinstalledandalignedcanhelptopreventthisfromoccurring.

Regularmaintenanceandinspectionofthesystemisalsoimportantinpreventingrubbingfaults.Thisincludescheckingforanysignsofwearordamage,andreplacinganywornordamagedcomponents.Itisalsoimportanttoensurethatanymaintenanceorrepairworkiscarriedout