ROMAC油膜轴承程序及试验台介绍PPT文件格式下载.pptx

ROMAC油膜轴承程序及试验台介绍PPT文件格式下载.pptx

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,PaulAllaire,Ph.D.MacWadeProf.,UniversityofVirginiaAmirYounanROMACSoftwareFellowTimDimondROMACTestRigFellow,1,FluidFilmBearingSoftwareandTestRig,Viscousshearing:

@#@frictionbetweendifferentlayersoffluidparticles,FundamentalPhysics（Hydrodynamic,SteadyState）,2,FluidFilmBearingSoftwareandTestRig,Steadystateloadcapacity（Hydrodynamicpressure）,MovingsurfaceViscousfluidConvergingwedge,3,FluidFilmBearingSoftwareandTestRig,FundamentalPhysics（Hydrodynamic,SteadyState）,4,Fixedgeometry:

@#@externalloadisvertical,butthejournalmovesboth,verticallyandhorizontally,indicating,FundamentalPhysics（Hydrodynamic,SteadyState）,Tiltingpad:

@#@externalloadisvertical,andthejournalmovesalmostpurelyvertically,indicatingminimumcross-,largecross-coupling.FluidFilmBearingSoftwareandTecstoRuigpling.,Interactionsbetweenvariousaspects,Whatneedstobemodeled?

@#@,FluidFilmBearingSoftwareandTestRig,5,Agoodbearingcodeshouldmodelallthoseaspects!

@#@,HydrodynamicbearingJournal（radial）bearings,FluidFilmBearingSoftwareandTestRig,6,THBRGTHPAD,（fixedgeometryjournalbearing）（tiltingpadjournalbearing）,MAXBRG（Alljournalbearing）ThrustbearingsTHRUSTHydrostaticbearingJournal（radial）bearingsHYDROBRG,Bearinganalysis,FluidFilmBearingSoftwareandTestRig,7,PressureTemperatureDeformationsTurbulenceMoreNumericalmethodFiniteElementMethod,ROMACdevelopedseveralcomputercodestoanalyzefluidfilmjournalbearingsEachcodehavedifferentcapabilitiesandaccuracyHowever,theysharesimilarinputandoutputparametersPrograminputGeometry（diameter,clearance,preload,length,）Lubricant（viscosity,specificheat,）Operatingcondition（speed,load,）Modelingoptions（adiabaticorwithcondition,variousdeformations,）,FluidFilmBearingSoftwareandTestRig,8,ROMACJournalBearingCodes,ProgramoutputEquilibriumposition（eccentricityandattitudeangle）MaximumBabbitttemperatureJournaltemperatureMaximumpressureMinimumfilmthicknessFlowratesFrictionpowerlossStiffnessanddampingcoefficientsRigidrotorstabilitythresholdspeed,FluidFilmBearingSoftwareandTestRig,9,ROMACJournalBearingCodes,THBRG,FluidFilmBearingSoftwareandTestRig,10,HydrodynamicjournalbearingcodeFixedgeometrydesignsPlainjournal,elliptical,offset,twoaxialgrooveandmulti-lobebearingsFloodedoilfeedconditionTemperatureeffectsincludedLaminarandturbulentflows1-DnumericalAssumeaxialpressureprofilesAssumedaxialandradialtemperatureprofilesFasttorun!

@#@,ROMACJournalBearingCodes,11,THBRGSteadyStatePropertiesandDynamicCoefficients,OilFilmDynamicForces:

@#@LinearModel,Representoilfilmasagroupofspringsanddampers,Ateachpointintime,forcesbecome,ThislinearmodelwithitsstiffnessanddampingcoefficientsformsthebasisofrotordynamicdesignCross-couplingisquantifiedbythecross-coupledstiffnesscoefficientsKxyKyx,THPAD,FluidFilmBearingSoftwareandTestRig,12,HydrodynamicjournalbearingcodeConventionaltiltingpaddesignsFloodedoilfeedconditionTemperatureeffectsincludedVariousdeformationsincludedLaminarandturbulentflows1-DnumericalAssumeaxialpressureprofilesAssumedaxialandradialtemperatureprofilesFasttorun!

@#@,ROMACJournalBearingCodes,ComparisonofTiltPadBrgK,CToMeasuredValues,FluidFilmBearingSoftwareandTestRig,13,THBRGandTHPADusethesamebasictheoriesandnumericalmethodsTheywereindustrialstandardandhavebeensuccessfullyusedbyROMACmembersformanyyearsTheyarecomputationallyveryefficientandstillwidelyusedtodayTofurtherexpandcapabilityandimproveaccuracy,thenewgenerationofROMACjournalbearingcodewasdevelopedMAXBRG,ROMACJournalBearingCodes,FluidFilmBearingSoftwareandTestRig,14,MAXBRG,FluidFilmBearingSoftwareandTestRig,15,BearingdesignsFixedgeometrybearings（alsoTHBRG）Plainjournal,elliptical,offset,twoaxialgrooveandmulti-lobebearingsConventionaltiltingpadbearings（alsoTHPAD）PressuredambearingsDirectlylubricatedbearings（inletgrooveandspraybar）OilfeedconditionsFlooded（alsoTHBRGandTHPAD）HighambientpressureAxialflowStarvationOilRing,ROMACJournalBearingCodes,AdvancedtheoriesusedbyMAXBRG,FluidFilmBearingSoftwareandTestRig,16,2-Dfiniteelementmethodforthepressureandtemperature2-DplainstrainfiniteelementmodelforpaddeformationsTurbulencemodelfine-tunedusingCFDapproachNewtheoryfordirectlubricationNewmodelsforstarvationCoupledfilm-padapproachleadingtorobusttemperaturecomputation,ROMACJournalBearingCodes,FixedGeometryJournalBearing,17,PressureDamJournalbearing,JournalBearingType:

@#@,TiltingPadJournalbearingFluidFilmBearingSoftwareandTestRig,TheoreticalModelingFilmTemperature,2-Dapproximationw/conductionAssumeconstantaxialtemperature（2-Dinxandy）AcceptableforfloodedflowconditionNotgoodforaxialflowhighambientpressureUnsmoothpadMisalignedshaft,x:

@#@circumferential