Experimental and theoretical analysis on the nonlinear rotor-dynamic performances and vibration characteristics of a novel bearing-rotor system

The abnormal vibration of the rotating shaft in propulsion system during the startup stage seriously reduces the concealment and safety of the ship navigation. This paper clarifies the rotor-dynamic and vibration performances of a new bearings-rotor coupled system. The rotor-dynamic model and the bearing-rotor coupled dynamic model under different lubrication states are established. The influences of rotating speed, external load, length-diameter ratio and other parameters on the lubrication performances and supporting behaviors of the bearings are analyzed. The variation laws of shaft vibration response under various working modules are revealed. Results of the test and theoretical have good consistency. Results enrich the theoretical system on the analysis and optimum design for such rotating systems.