The Effect of Unbalance on the Cyclic Stresses of a Flexible Rotor Mounted on Oil-Film Bearings Using Finite Elements Technique (ANSYS)

Eccentricity problem is considered as one of the most important and commonrepeated problems in rotary shafts in all machines. This will lead to generation ofvibration and extra loads on bearings. Also a non-uniformity can occur in distribution ofapplied load on all the surface of the bearing which being concentrated on one or twosides of the bearing surface. The purpose of this research is to investigate the effect ofthe unbalance on the values of stresses and deflections for a flexible rotor supported byoil film bearings. Various rotational speeds and unbalance effects has been taken in toconsideration. A dynamical model of the system has been built. The parameters ofjournal bearing have been determined using MATLAB/ simulink software. ANSYSprogram has been used for the analysis of the stresses produced during rotation.Keywords: Unbalance, Eccentricity, Simulation, Rotor Shaft.