Nonlinear characteristic analysis of shaft-bearing-pedestal system considering damage of cylindrical roller bearing

The nonlinear behaviors of the shaft-bearing-pedestal system considering damage of cylindrical roller bearing are analyzed in this study. Firstly, the model of the shaft-bearing-pedestal system with damaged cylindrical roller bearing is explored and the dynamic modeling is completed. The dynamic equations are solved by numerical method, and the nonlinear responses of the system are obtained. Then, the model is verified by comparing the experimental measurement signal with the numerical simulation value. Finally, the nonlinear behaviors under different loads, different damage sizes and different shaft speeds are studied. The results indicate that the peak to peak value of the vibration signal is positively correlated with the load F. As the load changes in the range of 100 N to 260 N, the system bifurcates from chaotic motion to 3T-periodic motion, and transits the chaotic motion through quasi-periodic 3 motion. The bifurcation diagram of the shaft-bearing -pedestal system shows complex nonlinear behavior, and bifurcation and jump behavior alternate. Properly increasing the load of the system during high-speed operation will contribute to improve the stability of the system.