【摘要】 磁液双悬浮轴承的液膜厚度小，转子与定子之间易发生碰摩现象，导致定子松动故障，进而引发转子非线性失稳及其混沌现象，磁液双悬浮轴承无法稳定运行。因此，针对磁液双悬浮轴承建立了单侧定子松动故障下的转子碰摩动力学方程，利用数值模拟法分析不同结构/运行参数对转子分岔行为的影响规律，并通过实验验证理论模型的准确性。研究结果表明，定子松动故障下降低偏心比或转速比可使磁液双悬浮轴承的转子从混沌状态恢复稳定单周期运动；增加支承刚度、阻尼或者松动质量可促进转子进入稳定单周期运动；实验测试所得转子运动周期变化规律基本与仿真结果保持一致。该研究为磁液双悬浮轴承的稳定运行提供了理论支撑。更多还原

【Abstract】 The small liquid film thickness in magnetic-liquid double suspension bearing(MLDSB) makes it prone to the rubbing phenomenon between rotor and stator, resulting in stator loosening faults, which further induces nonlinear instability and chaotic phenomena of rotor and reduce the operational stability of MLDSB. The rotor rubbing dynamics equation under unilateral stator loosening faults for MLDSB was established. The influences of different structural and operational parameters on rotor bifurcation behavior were analyzed using the numerical simulation, and theoretical model accuracy is verified by experiments. Research results indicate that reducing the eccentricity ratio or speed ratio under stator loosening faults can restore MLDSB rotor from the chaotic state to a stable single-period motion; increasing the support stiffness, damping, or loosening mass can promote rotor to enter a stable single-period motion; variation law of rotor motion period obtained by experiments is basically consistent with the simulation. Research results provide theoretical support for the stable operation of MLDSB.更多还原