Non Linear Analysis of Two lobe Journal Bearings with Surface roughness

Multi lobe journal bearings are used in machines which operate at high speeds and high loads. In this paper the two lobe bearing is analyzed to determine the effect of surface roughness during non linear loading. A non-linear time transient analysis was performed using the fourth order runge kutta method. The effect of eccentric ratio is studied and the variation of attitude angle is discussed. The journal center trajectories were calculated and plotted. Flow factor method is used to evaluate the roughness and the finite difference method is used to predict the pressure distribution over the bearing surface.