STABILITY AND BIFURCATION OF A ROTOR-FLUID FILM BEARING SYSTEM WITH SQUEEZE FILM DAMPER

The dynamical behaviors of a flexible rotor supported by two plain cyl indrical bearings surrounded by squeeze film damper are investigated. In this study, the Hopf bifurcation theory is used to investigate the stability of the equilibrium position of the system, then the unbalanc ed rotor response is determined by the shooting method and the stabili ty of these solution is examined using the Floquet transition matrix m ethod. It is shown that the quasi-periodic motion and period-doubling motion may be excited by the rotor unbalance.