Study on Nonlinear Vibration and Dynamic Characteristics of Rigid Rotor Roller Bearing System

Rotor system supported by roller bearing displays complicated nonlinear behavior due to nonlinear Hertzian contact force of roller bearing. In this paper, nonlinear bearing forces of roller bearing under four-dimensional loads are given, and four-DOF dynamic equations of rotor roller bearing system are established. The Newmark-β method and Newton-Raphson method are used to solve the nonlinear equations. In order to obtain accurate analysis data, the dynamic characteristics of rotor roller bearing system are computed considering coupling of bearing and rotor system. Finally, the critical speed of the rotor roller bearing system and axis orbit of the rotor are measured on a rotor bearing test bench, which are compared with the analysis results. The results demonstrate that the model and methods put forward in this paper to forecast the characteristics of rotor roller bearing system are precise.