A nonlinear dynamic model of rolling element bearing in EMUs with outer ring faults is built, and the nonlinear dynamics behavior of the model is analyzed Under the normal state and failure state. The rolling element bearing in this model is a tapered one, and three nonlinear factors were considered, such as clearance of bearing, nonlinear Hertzian contact force between balls and races, and unbalance force because of the rotor eccentric mass. In order to prove the validity of the model by comparing the varying compliance(VC) frequency and outer ring fault feature frequency which are derived from the simulation and actual calculate and get the complex nonlinear dynamic response, the numerical method is used. The dynamic stability of the system is analyzed considering various rotating speed and size of faults. The system gradually deviates the steady condition and goes to chaos earlier with the bigger rotating speed and fault size. The system bifurcation and chaos characteristics is studied based on the spectrogram, phase plan, bifurcation diagrams and Poincare map, from which the roads to chaos, such as the quasi periodic motion to chaos, paroxysmal and period-doubling bifurcation, are discovered in this paper. The results of the analysis have a certain significance for the study of failure mechanism and evolution rule of train axle box bearing.
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