AN EXPERIMENTAL AND COMPUTATIONAL STUDY OF NONLINEAR ASPECTS OF HIGH SPEED BEARING

Abstract

Rolling element bearing is extensively used in most of the rotating machines to support static or dynamic loading. These bearing take up both radial and axial load for most the application. They have great influence on dynamic behaviour of the rotating machines and act as sources of vibration and noise in this system. There is a critical need to increase reliability and performance of rolling element bearing to prevent catastrophic failure of machinery. Rolling element generates vibration during operation even if they are geometrically perfect. This is because of finite number of rolling element carry a load. The number of rolling element and their position in the load zone is changes with bearing rotation giving rise to generation of vibration. In the presentwork, experimental study of a rotor bearing system has been carried out to obtain vibration response due to localized defect such as spall on outer race, inner race and rolling element bearing. Vibration response obtained show that the every defect excites the system at its defect characteristic frequency or as an interaction with rotational frequency of rotor. Different categories of system behaviour under nonlinear dynamic condition due to localized defect in various element of bearing at 6000 rpm are discussed. The presence of chaotic behaviour is demonstrated using experimental vibration data and analytical procedure is presented by observing poincare maps