Chai Changpeng, Shi Saixin, Chen Jianlin, Dou Tenghao, Cao Junbo, Gao Dianrong, Zhao Jianhua
Fluid Power Transmission and Control Laboratory, Yanshan University, Qinhuangdao 066004, China.
Rev Sci Instrum. 2023 Jun 1;94(6). doi: 10.1063/5.0131729.
As the novel suspension bearing, Magnetic-Liquid Double Suspension Bearing (MLDSB) is mainly supported by magnetic suspension and supplemented by a liquid hydrostatic bearing. Due to its great bearing capacity and stiffness, rapid response, great active control, and so on, MLDSB is suitable for medium speed heavy loads and has a large carrying capacity and high operating stability. In addition, the radial inertia coupling and gyroscopic coupling between radial 4-DOF control channels can reduce control precision, operation stability, and reliability of MLDSB. Therefore, a mathematical model of radial 4-DOF rotor-dynamics of MLDSB is established in this paper, and the inherent coupling mechanism is explored. Taking inertial coupling, gyroscopic coupling, and external disturbance loads as lumped disturbances, a decoupled controller based on Generalized Extended State Observer (GESO) is established. The influence of the GESO controller on the decoupling and control performance of radial 4-DOF control channels is simulated. The results indicate that the decoupling effect of the GESO controller is great. Under the action of step signal, the steady displacement, maximum displacement, adjustment time, and peak time of the rotor after decoupling are all reduced, among which the steady displacement and maximum displacement are the most obvious. Under the sinusoidal signal, the steady displacement and maximum displacement are reduced by 90%, which can effectively avoid the "gap-impact" fault. Under the pulse signal, the steady displacement, maximum displacement, adjustment time, and peak time are all reduced, among which the maximum displacement is the most obvious. The research in this paper can provide a theoretical reference for the stable support and decoupling control of MLDSB.
作为一种新型的悬浮轴承，磁液双悬浮轴承（MLDSB）主要由磁悬浮支撑，并辅以液体静压轴承。由于其承载能力和刚度大、响应速度快、主动控制能力强等优点，磁液双悬浮轴承适用于中速重载，具有较大的承载能力和较高的运行稳定性。此外，径向四自由度控制通道之间的径向惯性耦合和陀螺耦合会降低磁液双悬浮轴承的控制精度、运行稳定性和可靠性。因此，本文建立了磁液双悬浮轴承径向四自由度转子动力学数学模型，并探讨了其固有耦合机制。将惯性耦合、陀螺耦合和外部干扰载荷作为集中干扰，建立了基于广义扩张状态观测器（GESO）的解耦控制器。仿真了GESO控制器对径向四自由度控制通道解耦和控制性能的影响。结果表明，GESO控制器的解耦效果良好。在阶跃信号作用下，解耦后转子的稳态位移、最大位移、调节时间和峰值时间均减小，其中稳态位移和最大位移最为明显。在正弦信号作用下，稳态位移和最大位移减小了90%，能有效避免“间隙冲击”故障。在脉冲信号作用下，稳态位移、最大位移、调节时间和峰值时间均减小，其中最大位移最为明显。本文的研究可为磁液双悬浮轴承的稳定支撑和解耦控制提供理论参考。
