Lateral and Torsional Vibrations of a Two-disk Rotor-stator System with Axial Contact∕Rubs

Abstract

The dynamics of a rotor system with axial contact/rub events between the disks and stator are investigated by numerical simulations. The coupled equations of lateral and torsional motions of rotor and the lateral motion of disk are established. Numerical simulations are carried out to reveal the lateral and torsional vibrations for both two‐disk contact/rubs and one disk contact/rubs. Bifurcation diagrams, orbits, phase portraits, amplitude‐ frequency spectra and Poincaré maps are adopted to demonstrate the dynamical behaviors of the system. The results show that though both the lateral and torsional vibrations can reflect the influences of contact/rubs on rotor dynamics, the spectrum analyses of the torsional vibrations are more suitable to determine straight the extent of their effect.