Vibration Analysis of Rotor Shaft System using Journal Bearing

Abstract

The present work deals with the development of finite element modelling for the analysis and study of vibration of rotor shaft system using journal bearing. The composite shaft is mounted an isotropic rigid disk and is supported by journal bearings at the ends those are modelled as springs and viscous dampers. The journal bearing for finite element model has been used based on the classical Reynolds equation for oil lubricated journal bearings. In this model the transverse shear deformation, rotor inertia and gyroscopic effects due to the lamination of composite layers have been incorporated. The equation of motion of composite rotor shaft-bearing system has been derived using the finite element method and the rotor shaft has also been modelled and analysed using Timoshenko beam theory. To verify the present model, the critical speeds of composite shaft system are compared with those available in the literature. Graphs were also plotted to illustrate the frequency and displacement response of composite rotor shaft system.