基于不平衡响应的磁悬浮轴承刚度阻尼辨识方法研究

磁悬浮轴承的支承特性对转子轴承系统的临界转速、不平衡响应、稳定性有着非常重要的影响。研究一种基于不平衡响应辨识磁悬浮轴承刚度和阻尼的方法。首先使用MSC.Patran建立磁悬浮轴承转子有限元模型；使用Matlab软件实现基于不平衡响应辨识磁悬浮轴承刚度阻尼的基本原理；然后用有限元模型进行仿真辨识来验证该方法的可行性；并对一个五自由度的磁悬浮轴承试验台进行基于不平衡响应的磁悬浮轴承刚度阻尼的辨识试验研究。最后，为了检验辨识结果的正确性，赋予转子有限元模型试验辨识的磁悬浮轴承的刚度和阻尼，进行仿真与试验的系统不平衡响应对比，结果两者基本一致，表明该方法可以有效地辨识磁悬浮轴承的刚度和阻尼。

Identification the Stiffness and Damping of Magnetic Bearings from Rotor Responses Due to Imbalances

The stiffness and damping of active magnetic bearings (AMBs) have a great influence to the dynamic characteristic of the rotor bearing system, such as critical speed; unbalance response and system stability as well. One identification method of stiffness and damping of AMBs from rotor dynamic response due to imbalances was provided. Firstly, rotor bearing finite element model was built by MSC.Patran. The program was compiled by Matlab software based on the identification method of the imbalance response. Then, the simulation of identification method was done by the rotor bearing finite model to make sure the probability of the method. Moreover the experiment of the identification of the stiffness and damping of the AMBs was completed. Lastly, in order to verify the reliability of the method, the coefficients which are identified by the experiment was gave to the finite element model of the rotor bearing system, and the imbalance response of simulation and experiment was compared to verify the accuracy of the identification method. The method is proved feasible to identify the stiffness and damping of the AMBs.