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Volume 6, September 2015, Pages 1-23
Stability analysis of slot-entry hybrid journal bearings operating with non-newtonian lubricant
H.C. Garg
Department of Mechanical Engineering, Guru Jambheshwar University of Science &Technology, Hisar-125001, India
Abstract
This paper presents theoretical investigations of rheological effects of lubricant on stability parameters of various configurations of slot-entry hybrid journal bearing system. FEM has been used to solve Reynolds equation governing flow of lubricant in bearing clearance space along with restrictor flow equation using suitable iterative technique. The non-Newtonian lubricant has been assumed to follow cubic shear stress law. The stability parameters in terms of stiffness coefficients, damping coefficients, threshold speed and whirl frequency of different configurations of slot-entry hybrid journal bearing have been computed and presented for wide range of external load while operating with Newtonian and Non-Newtonian lubricants. The computed results reveal that variation of viscosity due to non-Newtonian behavior of lubricant affects bearing stability quite significantly. The results are presented in graphical form and logical conclusions are drawn to identify best possible configuration from stability point of view.
Keywords
Slot-entry; Journal bearing; Hybrid; Non-Newtonian lubricant; Stability parameters
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