NON STATIONARY VIBRATION SIGNAL ANALYSIS OF ROTATING MACHINERY VIA

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1、10thInternationalConferenceonInformationSCience,SignalProcessingandtheirApplications(ISSPA2010)NON-STATIONARYVIBRATIONSIGNALANALYSISOFROTATINGMACHINERYVIATIME-FREQUENCYANDWAVELETTECHNIQUESFadiAl-Badourl,L.Chedect,andM.Suna/[MechanicalEngineeringDepartment,2SystemsEngineeringDe

2、partment,KingFahdUniversityofPetroleum&MineralsKFUPM,31261,Dhahran,SaudiArabiaemail:fbadour@kfupm.edu.sa.cheded@kfupm.edu.sa.mehmets@kfupm.edu.sa.ABSTRACTtransformsusedarethecontinuouswavelettransform(CWT)andthediscretewavelettransform(DWT).ThestrengthoftheWaveletPacketTransfo

3、rm(WPT)hasnotbeenfullyexploitedinvibraThispaperintroducesanefficientandpowerfulapproachtofaulttionanalysis.Themajorcontributionofthispaperistoshowthedetectioninrotatingmachineryusingtime-frequencyanalysispoweroftheWPTinreliablyandeffectivelydetectingnonbasedonbothFourierandwav

4、elettransformsofthemonitoredstationarymechanicalfaults.vibrationsignal.Time-frequencytechniquesarepowerfultoolsforNon-stationarymechanicalsignalscouldbeclassifiedintotwoanalyzingtransientinformationinvibrationsignaturejorbothgroups:(a)Evolutionaryharmonicorfrequency-modulateds

5、ignal:conditionmonitoringandfaultdetectionpurposes.Ourworkonthesearegeneratedbysomeunderlyingperiodictime-varyingfaultdetectionreportedinthispaperistwo-fold:(l)applicationphenomenonlikeachangeinrotationalspeedduringmotorstartoftheshort-timeFouriertransforms(STFT)andtheexploita

6、tionuporshutdown.(b)Transientsignals:theseareshort-timeeventsofthespectrogram-basedtime-frequencydistributiontodetectwithanunpredictabletimebehaviourwhichgivesthemarandomvariousmechanicalfaultsduringthestart-up&coastdownphasnature.Examplesofthistypeofsignalsareimpactloading,ru

7、besinrotatingmachineryand(2)applicationofanovelwaveletbing,failureofageartoothandothers.basedtechniquecombiningboththecontinuouswaveletandtheThetestscarriedouttosimulatenon-stationarysignalsareexwaveletpackettransforms.Thisnoveltechniqueexploitstheuseplainednext:first,carryout

8、atheimportantfaststart-uptest,ofthemodulusofthelocalmaximalin