Analysis of Cracked Rotor With Gyroscopic Effects Supported on Textured Journal Bearings

This paper present the analysis of a cracked rotor shaft with an offset disc attached to it and mounted on textured journal bearings. The bearings are modelled using linearized stiffness and damping coefficients, both direct and cross-coupled. The shaft and disc are modelled using finite element theory. The shaft and disc masses, stiffnesses and their gyroscopic effects are considered. The crack is modeled based on fracture mechanics approach. The rotor dynamic modelling and analysis of the system considering the effect of crack geometry is carried out to obtain the system whirl frequencies. The system is represented in reduced order state-space form and its critical speeds are obtained by plotting the Campbell diagram.