Purpose

The fluid machinery supported by active magnetic bearing (AMB) has the advantages of high efficiency, low loss and easy maintenance, so it has a good application prospect. However, the self-excited vibration of impeller-shaft coupling in static suspension caused by the active characteristics of active magnetic bearing is a new problem that has not been discovered in traditional hydromechanics, and it is also a key problem that affects the normal operation of magnetic suspension fluid machinery.

Methods

Aiming at the problem of high frequency self-excited vibration of flexible rotor AMBs, a novel self-excited vibration suppression method based on notch filter was proposed. Firstly, the additional stiffness matrix introduced by interface contact is derived, and the mechatronics model of the magnetic levitation flexible rotor system is established. Secondly, the principle of the notch filter to suppress the high frequency self-excited vibration is revealed, and the stability of the whole closed-loop system is analyzed. Finally, the feasibility and effectiveness of the proposed control method are verified by simulation and experiment.

Results and Conclusion

The research results show that the notch filter can completely suppress the self-excited vibration of the impeller rotor of the fluid machinery, which provides a guarantee for the high speed and reliable operation of the system.

中文翻译：

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柔性转子AMBs系统自激振动分析与抑制

目的

以主动磁轴承（AMB）为支撑的流体机械具有效率高、损耗低、维修方便等优点，具有良好的应用前景。然而，由主动磁轴承的主动特性引起的静悬浮叶轮轴联轴器自激振动是传统流体力学中尚未发现的新问题，也是影响正常运行的关键问题。磁悬浮流体机械。

方法

针对柔性转子AMB高频自激振动问题，提出了一种基于陷波滤波器的自激振动抑制新方法。首先推导了界面接触引入的附加刚度矩阵，建立了磁悬浮柔性转子系统的机电一体化模型。其次,揭示了陷波滤波器抑制高频自激振动的原理,分析了整个闭环系统的稳定性。最后，通过仿真和实验验证了所提出的控制方法的可行性和有效性。

结果和结论

研究结果表明，陷波滤波器可以完全抑制流体机械叶轮转子的自激振动，为系统的高速可靠运行提供了保障。