Numerical analysis of the effect of elastic deformation on the static characteristics of a circular journal bearing lubricated with a ferrofluid

Abstract

The present study investigates the effect of elastic deformation on the static characteristics of a circular journal bearing operating with a ferrofluids. Applying momentum and continuity equation, for ferrofluid under the applied magnetic field, the modified Reynolds equation is derived using the Neuinger-Rosensweig model. A magnetic field is created by displaced finite wire. The elastic thin liner model is used for determining the displacement field at the fluid film bearing liner interface. To obtain the pressure distribution, the modified Reynolds equation is solved using finite difference technique with appropriate iterative technique incorporating Reynolds boundary conditions. The static performance characteristics for journal bearing in terms of the load carrying capacity, the attitude angle, friction coefficient and the side leakage are studied for various values of the magnetic force coefficient and the elastic deformation coefficient. According to the results obtained, it is found that the increasing of magnetic force coefficient produces an increase of the film pressure, load carrying capacity, attitude angle and side leakage, while it decreases the friction coefficient increases. In addition, it is found that the effect of the elastic deformation on the static characteristics for the journal bearing is depending to the values of the eccentricity ratio and the magnetic force coefficient. The presence of magnetic fields significantly enhances the performance of a rigid and deformable journal bearing.