Imbalance–misalignment–rubbing coupling faults in hydraulic turbine vibration

To solve the turbine generator set's fault, a nonlinear dynamics model of the imbalance–misalignment–rubbing coupling fault is established. The dynamic behavior of the system with the rotor speed is also studied with numerical integration methods. The nonlinear dynamic response of generator rotor and turbine rotor at coupling fault is analyzed systematically by a series of methods, such as bifurcation diagrams, Poincaré map, Orbit, time-domain waveform and amplitude spectrum. Combined with the experimental simulation on the experiment table, it is demonstrated that the system model can fit in current situation very well, which can be applied to the dispose analysis of the coupling fault.