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ID:38613695
大小:706.00 KB
页数:15页
时间:2019-06-16
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1、InvestigationoncriticalspeedandvibrationmodeofhighspeedgrinderAbstractTheinfluencesofthegrinderspindle’smajorstructuralparametersonitsvibrationmodewereinvestigated.Basedonthetransfer-matrixmethodandtakingintoconsiderationthegyroscopiccouple,theshear,thevariablecr
2、oss-sectionandotherinfluentialfactors,adynamicmodelwasestablishedforthemulti-diskrotoroftherotor-bearingsystemofthegrinderspindle.Thecriticalspeedsoffirstthreeorders,themodesofvariationandotherdynamiccharacteristicparametersofthegrinderspindlewereprogrammedandcal
3、culated.Theinfluencesoftheaxialpre-tighteningforceofthebearing,thespanofthefulcrumbearingaswellasthechangesinthefrontandrearoverhangsonthecriticalspeedoftherotor-bearingsystemonthegrinderspindleandtheirpatternofchangeswereanalyzed.Theresultsshowedthattheworkingsp
4、eedofthespindlesystemismuchlowerthantheprimarycriticalspeedandcanthereforestayawaytheresonancerangeeffectively.1.IntroductionThespindleofhighspeedgrindingmachinetoolisatypicalhighspeedbearings-rotordynamicssystem,anditsrotatingspeedfarsurpassesthecriticalspeedoft
5、helowordersystem.Therealizationofdynamicbalanceisassociatedwiththeperformanceandstabilityofthewholeequipment.Theresearchofrotordynamicbalancemainlyinvolvedtherigidrotorbeforethe1950s[1-4].Withtheincreaseoftherotatingspeedandtheflexibilityof,theresearchonthemethod
6、offlexiblerotor’sdynamicbalanceappeared.Theearlystagemethodofflexiblerotor’sdynamicbalancewasputforwardbyFeder,whichwaslatercalledvibrationbalancemethodormodalbalancemethod.Thenumberoftimesofstart-upofhigh-speedbalancewasrelativelyless,andisofhighsensitivity.Thel
7、owordermodewouldnotbeaffectedwhenthebalancingofhighordermodewasconducted,butidentificationwasnotbalanced[5-7].Theinfluenceofbearingcharacteristicswasespeciallygreatunderlargedamping.Itwasnoteasytoachievesinglemodewhenusednearcriticalspeedinshaftingbalance.Laterth
8、eAmericanGoodmanformallypresentedinfluencecoefficientmethodbasedonleastsquaremethod,anditsadvantageswereasfollows:electroniccomputercouldbeusedtoassistdynamicb
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