Nonlinear dynamic modeling and vibration analysis of bearing system considering shaft current damage

Based on the structure of damaged bearing, a nonlinear dynamic model is proposed. The nonlinear vibration response is obtained by solving the dynamic equation of the bearing system. Firstly, the influence of radial load and rotational speed on the nonlinear vibration response of the bearing system is analyzed. Then, the different vibration characteristics of the system when the inner and outer raceways of the bearing are damaged are discussed. Finally, the influence of the degree of shaft current damage on the nonlinear characteristics of the bearing system is studied. The results indicate that the bearing system presents bifurcation, jump, and chaos with the change of radial load. With the increase of the rotational speed, the path of the bearing system from chaos to quasi-periodic changes. With the increase of the degree of shaft current damage, the system gradually transitions from a stable state to a chaotic state.