Volume : 2, Issue : 4, April - 2013

A review on Dynamic Behavior of Rotor Roller System with Bearing Defects

A. V. Prajapati, Prof. U. A. Patel, Nemisha Gauswami

Abstract :

Rotating machinery is becoming faster and lightweight due to the advanced technologies made in engineering and materials sciences. It is required them to run for longer periods of time. The high speed rotor bearing system often shows unpredictable dynamic response due to manufacturing defects. As it is not possible to produce perfect surface or contour even with the best available machine tools so imperfection such as surface waviness in the rolling element and races developed during manufacturing process cannot be avoided. The radial and axial clearance provided in the design of bearings to compensate for thermal expansion, can also be a source of viations and introduce nonlinearity in the dynamic system. Using viation analysis, the condition of a machine can be periodically monitored. The main objective of this paper is to study the nonlinear dynamic behavior of rotor–roller bearing system with localized and distributed bearing defects. Like, internal clearance, waviness, off sized rolling element, case run–out etc. The localized defects include cracks, pits and spalls caused by fatigue on rolling races. Distributed defects include surface roughness, waviness and misaligned races and off size rolling elements