Removal of Order Domain Content in Rotating

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1、RemovalofOrderDomainContentinRotatingEquipmentSignalsbyDoubleResamplingBy:CharlesL.GrooverMartinW.TretheweyDepartmentofMechanicalandNuclearEngineeringPennStateUniversityUniversityPark,PA16802USAKennethP.MaynardMitchellS.LeboldAppliedResearchLaboratoryPennStateUniversityUni

2、versityPark,PA16802USASubmittedto:MechanicalSystemsandSignalProcessingCorrespondingAuthor:MartinW.Trethewey329ReberBuildingPennStateUniversityUniversityPark,PA16802USAEmail:mwtrethewey@psu.eduFAX:+814-865-9693Submitted:June2003Revised:September2003Groover,Trethewey,Maynard

3、&Lebold-OrderRemovalbyDoubleResampling2AbstractFixedfrequencycontent(i.e.,componentorstructuralresonances)inspectraobtainedfromrotatingequipmentcanbemaskedbythestrongsourcesatharmonics(order)oftheshaftrunningspeed.Theratioofthefixedfrequencycomponentstotheordercomponentsca

4、nbegreaterthan60dBmakinginterpretationofresonancesinthespectradifficult.Hencetheordercomponentsareviewasacorruptingphenomenon.Anapproachtoremovetheordercomponentsfromthespectra,withoutaffectingtheremainingfrequencydomaininformationispresentedinthiswork.Thetechniqueutilizes

5、asequenceofdatasamplingandtransformations,betweenthetime,orderandfrequencydomainsasfollows:1.Vibrationdataissampledusingaconstanttimebasis(∆t).2.Thetimescorrespondingtoaconstantangularbasis(∆θ)aredetermined.3.Thevibrationdataisinterpolatedtoaconstantangularbasis(∆θ).4.Thec

6、onstantanglesampleddataistransformedviatheFFTtotheorderdomain.5.Thehighamplitudeordercomponentsarenowexactlybincenteredandcanberemovedfromthespectra.6.AninverseFFTisappliedtoreturntoaconstantangularincrementsampled(∆θ)array,sansordercontent.7.Theconstantangularincrementsam

7、pled(∆θ)arrayisinterpolatedtoanarraysampledwithconstanttimebasis(∆t).8.AFFTisappliedandthenstandardspectralestimationproceduresareappliedtocomputethevibrationspectrawiththehighlevelordersremoved.Thetheoreticalandimplementationdetailsofthedoubleresamplingapproacharediscusse

8、d.Theapproachisappliedtoexperimentaltorsionalvibrationdataacquiredfromalaboratorytestrigd