Rotor dynamics theory is the basis for studying the motion of rotating machinery, and rotating machinery such as water turbines, steam turbines, and aero engines are indispensable core equipment for related industries. However, the current research on rotor dynamics is mostly based on linear conditions, which can no longer meet modern requirements. Engineering requirements, so the study of nonlinear rotor dynamics seems significant. The research purpose of this paper is to study the nonlinear dynamic model. Based on the theory of nonlinear rotor dynamics and the theoretical basis of the finite element method, a finite element simulation method is used to study the nonlinear rotor dynamics. In this paper, the finite element model in the discrete mass model is used. After introducing the research method and eddy theory of nonlinear rotor dynamics, the factors that may cause non-linear interference to the rotor motion in the rotor system are analyzed. The problem was simulated and analyzed, and the movement behavior of the eccentric rotor under elastic support was simulated by means of simulation, and the nonlinear effect of eccentricity on the rotor system was proved.

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