ROMAC油膜轴承程序及试验台介绍.pptx

PaulAllaire,Ph.D.MacWadeProf.,UniversityofVirginiaAmirYounanROMACSoftwareFellowTimDimondROMACTestRigFellow1FluidFilmBearingSoftwareandTestRig

Viscousshearing:frictionbetweendifferentlayersoffluidparticlesFundamentalPhysics(Hydrodynamic,SteadyState)2FluidFilmBearingSoftwareandTestRig

Steadystateloadcapacity(Hydrodynamicpressure)MovingsurfaceViscousfluidConvergingwedge3FluidFilmBearingSoftwareandTestRigFundamentalPhysics(Hydrodynamic,SteadyState)

4Fixedgeometry:externalloadisvertical,butthejournalmovesbothverticallyandhorizontally,indicatingFundamentalPhysics(Hydrodynamic,SteadyState)Tiltingpad:externalloadisvertical,andthejournalmovesalmostpurelyvertically,indicatingminimumcross-largecross-coupling.FluidFilmBearingSoftwareandTecstoRuigpling.

InteractionsbetweenvariousaspectsWhatneedstobemodeled?FluidFilmBearingSoftwareandTestRig5Agoodbearingcodeshouldmodelallthoseaspects!

HydrodynamicbearingJournal(radial)bearingsFluidFilmBearingSoftwareandTestRig6THBRGTHPAD(fixedgeometryjournalbearing)(tiltingpadjournalbearing)MAXBRG(Alljournalbearing)ThrustbearingsTHRUSTHydrostaticbearingJournal(radial)bearingsHYDROBRG

BearinganalysisFluidFilmBearingSoftwareandTestRig7PressureTemperatureDeformationsTurbulenceMore…NumericalmethodFiniteElementMethod

ROMACdevelopedseveralcomputercodestoanalyzefluidfilmjournalbearingsEachcodehavedifferentcapabilitiesandaccuracyHowever,theysharesimilarinputandoutputparametersPrograminputGeometry(diameter,clearance,preload,length,…)Lubricant(viscosity,specificheat,…)Operatingcondition(speed,load,…)Modelingoptions(adiabaticorwithcondition,variousdeformations,…)FluidFilmBearingSoftwareandTestRig8ROMACJournalBearingCodes

ProgramoutputEquilibriumposition(eccentricityandattitudeangle)MaximumBabbitttemperatureJournaltemperatureMaximump