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针对矿井通风机中磁悬浮轴承的工作条件,对转子的振动特性进行了理论分析与数值模拟。将磁悬浮转子假设为连续均匀的弹性体建立数学模型,根据转子运动微分方程推导出临界转速的求解方法。通过ANSYS/Workbench对转子进行模态分析,得出转子的各阶振型,并基于Matlab对不同临界转速下的转子刚度与阻尼进行数值模拟,结果表明,随着转速的增加,转子的柔性增大。
Aiming at the working condition of the magnetic bearing in the mine ventilator, the vibration characteristics of the rotor are theoretically analyzed and numerically simulated. The mathematical model of the suspension is assumed to be a continuous and uniform elastic body, and the solution to the critical speed is deduced according to the rotor differential equation. The modal analysis of the rotor is carried out by ANSYS / Workbench, and the vibration modes of the rotor are obtained. Based on Matlab, the numerical simulation of the rotor stiffness and damping under different critical speeds is carried out. The results show that with the increase of rotational speed, Big.