A dynamic model of a rotor–bearing system with two discs is proposed in this study. The effect of eccentric phases of two discs on the oil-film stability is investigated. Considering the gyroscopic effect, the nonlinear dynamic behavior of the rotor-bearing system with two discs is analyzed based on the Finite Element Method. Two sliding bearings are simulated by the unsteady nonlinear oil-film force based on the assumption of short bearing model. The Newmark integration method is adopted to solve the equation. The research focuses on the stable region considering the eccentric phases of two discs and nonlinear responses of the rotor–bearing system by using the Poincaré maps, bifurcation diagrams and spectrum cascades. The results indicate the influence of different eccentric phases of two discs on dynamic response. The relationship between the stable region of the rotor-bearing system and eccentric phases of two discs is obtained, which is very important for the design of the rotor-bearing system.

Volume Subject Area:
Dynamics, Vibration, and Control
Topics:
Bearings, Rotors, Stability, Disks, Bifurcation, Design, Dynamic models, Dynamic response, Finite element methods, Poincaré maps
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