Study on the nonlinear dynamics of the rotor-bearing-seal system for the large scale rotating machinery

Along with increase of the fluid parameters for the high-performance rotating machinery, the fluid induced force of the seals signally influenced the rotor system. In this paper, it mainly presents the effect of the fluid induced force on the rotor-bearing-seal system, and the nonlinear dynamic functions of the rotor-seal system are obtained with the Capone oil-film force model and Muszynska fluid-induced force model. The dynamic characteristics of the system at the different parameters are analyzed by the periodical responses, Poincaré maps, frequency spectrums charts, bifurcation charts, etc. The abundant nonlinear dynamic behaviors of the system are revealed by the nonlinear effects.