Abstract: Nonlinear dynamics and stability of the rotor bearing seal system are investigated both theoretically and experimentally. An experimental rotor bearing seal system is simplified as the Jeffcott rotor. The nonlinear oil film forces are obtained under the short bearing theory and Muszynska nonlinear seal force model is used. Numerical method is utilized to solve the nonlinear governing equations. Bifurcation diagrams, Poincar maps, spectrum plots and rotor orbits are drawn to analyze various nonlinear phenomena and system unstable processes. Theoretical results from numerical analysis are in good agreement with results from experiments.

Key words: vibration and wave, rotorbearingseal system, nonlinear dynamics, stability

摘要：

采用理论分析和试验研究相结合的方法，研究油膜力和密封力联合作用下转子轴承密封系统的非线性动力学特性和稳定性。将转子轴承密封试验台系统等效为Jeffcott系统，采用短轴承理论建立油膜力的非线性模型，采用Muszynska模型建立非线性的密封力。通过数值仿真研究在不同转子转速下密封力对系统非线性特性和稳定性的影响。将试验结果与理论计算进行比较，两者基本一致。