Feature analysis of interaction on rub-impact and oil-film faults for a rotor-bearing system

This study deals with experimental investigations where the nonlinear features of an asymmetric double-disc rotor-bearing system are reproduced considering rub-impact and oil-film instability. A dedicated experimental set-up was designed to validate the interaction between rubs and oil-firm vibration. The experimental study focuses on the interaction of oil-whirl/whip and rub-impact faults, and the results show that the oil-whirl is restrained or even removed but the whip is uninfluenced when the rub becomes heavy contact. The results from the experiments indicate that the motion of system becomes simple and the oil-whirl gets diminished or even disappeared but the whip keeps unchanged when the eccentricity or the stator stiffness increases. The research discloses the worthy energy exchange phenomenon of multi-fault system, and presents the nonlinear dynamical characteristics of the interaction between rub-impact and oil-film instability for such a rotor-bearing system.