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VIBRATIONCHARACTERISTICSANALYSISOFTHERUB-IMPACTROTORSYSTEMWITHMASSUNBALANCE#5JIAJiuhong,HANGTianqi*(KeyLaboratoryofPressureSystemsandSafety,MinistryofEducation,EastChinaUniversityofScienceandTechnology,ShangHai200237)Abstract:Inthispaper,vibrationcharacteristicsofarub-impactJeffcottrotorsystemexcitedbymassunbalanceincludingtheeccentricmassandtheinitialpermanentdeflectionareinvestigated.Through10thenumericalcalculation,rotatingspeeds,masseccentricities,initialpermanentdeflectionsandphaseanglesbetweentheeccentricmassdirectionandtherotorinitialpermanentdeflectiondirectionareusedascontrolparameterstoinvestigatetheireffectontherub-impactrotorsystemwiththehelpofbifurcationdiagrams,Poincaremaps,frequencyspectrumsandorbitmaps.Resultshowsthatthesetwokindsofmassunbalancehavegreatbutdifferenteffectonthedynamiccharacteristicoftherubbing15rotorsystem.Differentmotioncharacteristicsappearwiththevaryingofthesecontrolparameters,andcomplicatedmotionssuchasperiodicandquasi-periodicvibrationsareobserved.Correspondingresultscanbeusedtodiagnosetherub-impactfaultanddecreasetheeffectofrubimpactintherotorsystemwithmassunbalance.Keywords:Rub-impactrotorsystem;Massunbalance;Nonlinearmotion200IntroductionMassunbalanceoftherotoristhemainfactortoincreasevibrationandbringunstablecharacteristicstothewholerotorsystem[1-2].Sincetherotor-statorrubisoneofthemainfaultsforlargerotarymachines,ithasattractedgreatconcernandlotsofresearchworkhasbeendoneby25manyresearchers.JunyiCao[3]investigatednonlineardynamiccharacteristicsofrub-impactrotorsystemwithfractionalorderdamping.Fromthestudy,variouscomplicateddynamicbehaviorsandtypesofroutestochaoswerefound,includingperioddoublingbifurcation,suddentransitionandquasi-periodicfromperiodicmotiontochaos.Jawaidi[4]investigateddynamicsofarigidrotorsupportedbyload-sharingbetweenmagneticandauxiliarybearingsforarangeofrealisticdesign30andoperatingparameters.Manyphenomenawerefoundandstudied.WenmingZhang[5]carriedoutananalyticalinvestigationon
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