内圆磨床毕业设计翻译原文

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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