Analysis of Vibration Characteristics of Rotor Eccentricity for Generator in a Mobile Power Station

Due to machining accuracy, installation error and other factors, the rotor has various eccentricity, which will cause adverse effects on the operation of generator of certain mobile power station and even lead to all systems failure. In order to investigate the generator rotor's vibration characteristics, taking a military mobile power station generator as the research object, a Jeffcott rotor model is established which considering rotor eccentricity with cubic term in this paper. It is consistent with the Duffing equation in any transverse motion equation. It is simplified to Duffing equation for solving. The analytical solution is solved by the Runge-Kutta method. By studying the effects of various types mechanical parameters on the transverse vibration, the rotor system's main resonance is studied: the stiffness has extremely few effect on the amplitude change, however, the stability of the system changes greatly with them. While the amplitude only changes and the mass eccentricity reaches a certain value, the rotor system is prone to rub. Resonance amplitude, the response and phase of the system are all affected by the damping, therefore, damper is one of the most effective ways to suppress vibration of generator.