Abstract

To study the dynamic support characteristics of an auto-eliminating clearance auxiliary bearing (ACAB) after a rotor fall, this article proposes a parameter identification method based on the finite element method (FEM). First, a dynamic model of the magnetic suspension bearing–rotor system was established. Next, the support stiffness and damping matrices of the ACAB were deduced and the feasibility of identifying the support characteristics of the ACAB by the FEM-based method were verified in a simulation study. The ACAB support characteristics were also determined in an experiment. The unbalance response of the rotor was obtained under unbalance excitation, and the stiffness and damping values of the ACAB at various rotational speeds of the rotor were obtained by the FEM-based parameter identification method. Finally, the identification results were verified by comparing the theoretical and experimental data.

摘要

为了研究转子脱落后自动消除游隙辅助轴承（ACAB）的动态支撑特性，提出了一种基于有限元方法（FEM）的参数辨识方法。首先，建立了磁悬浮轴承-转子系统的动力学模型。接下来，推导了ACAB的支撑刚度和阻尼矩阵，并在仿真研究中验证了通过基于FEM的方法识别ACAB的支撑特性的可行性。还通过实验确定了ACAB的支持特性。通过基于FEM的参数识别方法获得了转子在不平衡激励下的不平衡响应，并获得了ACAB在转子各种转速下的刚度和阻尼值。最后，