Static and dynamic analysis of hydrodynamic journal bearing operating under nano lubricants

In this paper, the static and dynamic analysis of hydrodynamic journal bearing operating under nano lubricants are presented. The load carrying capacity of journal bearing mainly depends upon the viscosity of the lubricant. The addition of nano particles on commercially available lubricant may enhance the viscosity of lubricant and in turn changes the performance characteristics. In the proposed work, to obtain pressure distribution in the clearance space of the journal bearing, modified Raynolds equation is used. An iterative procedure is used to establish the film extent of the bearing. The modified Raynolds equation is solved by using the powerful numerical technique, finite element method. The static characteristics in terms of load capacity, attitude angle and end leakage and dynamic characteristics in terms of stiffness coefficients, damping coefficients, threshold speed and damped frequency of whirl are evaluated for different eccentricity ratios.