Static and dynamic performances of ferrofluid lubricated long journal bearing

Due to the advantageous property of reduction of load friction, low wear and good damping characteristics, journal bearings are widely used in industry. They are equipping various rotating machineries like small electrical motors to large generators, internal combustion engines, centrifugal pumps, turbine shaft of most jet engines, crankshaft of an automobile engines, etc. In this paper, static and dynamic performances of ferrofluid (FF) lubricated long journal bearing are studied using rotational and translational approach of the journal. Here, FF is controlled by the transverse uniform magnetic field. The modified Reynolds equation is derived by considering FF flow behaviour given by Shliomis and continuity equation in the film region. The dimensionless expressions for load-carrying capacity, frictional force and coefficient of friction are studied for static case, while the dimensionless expressions for stiffness coefficients and damping coefficients are studied for dynamic case. It is observed that comparing with conventional lubricant the bearing performance is significantly modified in the present analysis.

Automated summary

This paper investigates the static and dynamic performance of ferrofluid lubricated long journal bearing, deriving a modified Reynolds equation by considering the flow behavior of the ferrofluid and continuity in the film region. The dimensionless expressions for load-carrying capacity, frictional force, coefficient of friction, stiffness coefficients, and damping coefficients are studied, showing a significant improvement in bearing performance compared to conventional lubricants.