This paper deals with the stability margin of a constant flow valve compensated hole-entry hybrid journal bearing system considering bearing flexibility and variation of viscosity due to temperature rise of the lubricant. The journal temperature is computed on the basis of average fluid-film temperature and axisymmetric isothermal element is assumed. The coupled solution of Reynold’s, energy, conduction, and elasticity equations is obtained using finite element method. The performance of a symmetric and asymmetric hole-entry hybrid journal bearing configurations is studied. The results presented in the study indicate that the bearing flexibility and temperature rise of the lubricant fluid-film affects the performance of the hole-entry hybrid journal bearing system quite significantly and proper selection of restrictor design parameter is quite useful in maintaining the fluid film thickness and threshold speed of the journal.

Issue Section:
Technical Notes
Keywords:
liquid films, viscosity, lubricants, finite element analysis, flow simulation, thermoelasticity, machine bearings, lubrication
Topics:
Bearings, Boundary-value problems, Deformation, Fluid films, Journal bearings, Lubricants, Stability, Temperature, Viscosity, Flow (Dynamics), Thermoelasticity, Fluid dynamics
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 by ASME
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