Steady state and stability characteristics of hydrostatic two-layered porous oil journal bearings are obtained. The governing differential equations are solved numerically using the finite difference method for a wide range of design parameters. The effects of the eccentricity ratio, slenderness ratio, bearing number, feeding parameter and anisotropy of permeability on the load-carrying capacity, attitude angle, friction variable and oil flowrate have been investigated. Stability analysis has been performed using the linearized perturbation method. It has been observed that a two-layered porous bearing gives higher stability than a single-layered porous bearing.

Steady-state and stability characteristics of hydrostatic two-layered porous oil journal bearings

Porous metal bearings — A critical review

Closed-form analytical solutions for three different types of squeeze-film porous bearing are introduced in this paper. The effects of the permeability parameter on the pressure profile, load-carrying capacity, and time required to squeeze the fluid out of the lubricated conjunction are presented. The results show that as the permeability parameter increases, both the pressure profiles and the load-carrying capacity of the bearing decrease in the case of pure squeeze motion. Furthermore, the results show that for dimensionless permeability parameters less than 0.001, the effect of the porous layer on the hydrodynamic lubrication of squeeze-film porous bearings can be neglected.

Hydrodynamic lubrication of squeeze-film porous bearings

The steady state performance of gas-lubricated two-layered porous journal bearings is analysed theoretically by an iterative method considering three-dimensional flow through the porous mat...

Study of externally-pressurized gas-lubricated two-layered porous journal bearings: A steady state analysis

A theoretical investigation has been carried out for stability characteristics of a finite hydrostatic double-layer porous oil journal bearing considering the effect of Beavers-Joseph velocity slip at the porous film interface. A linearized perturbation method has been used to obtain the threshold of stability in terms of critical mass parameter. The effect of slip parameters, eccentricity ratios, bearing feeding parameter, and slenderness ratio on the stability is investigated. Furthermore, nonlinear transient analysis is carried out to determine the system stability by tracing the journal center locus. Several trajectories of the journal center locus have been obtained for different operating conditions and are depicted with the help of graphics.

Rigid Rotor Stability Analysis on Finite Hydrostatic Double-Layer Porous Oil Journal Bearing with Velocity Slip

http://jms.sagepub.com/content/14/5/335.full.pdf

C. Cusano

Papers

Lubrication of a Two-Layer Porous Journal Bearing