UNBALANCED RIGID ROTOR WITH TWO-LOBE WAVE JOURNAL BEARINGS

The paper illustrates a numerical investigation aimed at characterizing the effect of geometry and orientation of two-lobe wave journal bearings (2LB) onto the dynamical behavior of a rigid rotor. Static unbalance and equal bearings at both ends of the shaft justify the system symmetry with respect to its middle plane. Wave amplitude of the bearing profile and bearing angular orientation, together with the level of unbalance, represent the main system parameters. Bifurcation diagrams obtained with Poincaré sections and continuation method illustrate the results of simulation obtained for suitable sets of parameter values. Despite its richness, the dynamic behavior shows the potentials for a possible optimized use of the bearing profile, to be assessed with further investigation.