Rub-Impact Rotor Supported by Journal Bearings Lubricated with Micro-polar Fluid - Bifurcation and Chaos Analysis

The bifurcation and chaos analysis of a rub-impact rotor bearing system with nonlinear suspension are investigated on the basis of assumptions of the micropolar lubricant along with short bearing approximation. The dynamics of the rotor center and bearing center are studied. The spatial displacements in the horizontal and vertical directions are considered for various non-dimensional speed ratios and dimensionless unbalance parameter. The numerical results show that the stability of the system varies with the dimensionless speed ratios, the dimensionless unbalance parameter and the dimensionless parameter N^2. The contribution of this study is to provide a further understanding of characteristics and dynamic behaviors of the rotor-bearing system