Magnetic liquid double suspension bearing (MLDSB) includes electromagnetic system and hydrostatic system, and the bearing capacity and stiffness can be greatly improved. It is very suitable for the occasions of medium speed, heavy load, and starting frequently. Due to the mutual coupling and interaction between electromagnetic system and hydrostatic system, the probability and degree of static bifurcation are greatly increased and the operation stability is reduced. And flow of bearing cavity, coil current, oil film thickness, and galvanized layer thickness are the key parameters to ensure operation safe and stable, which has an important influence on the static bifurcation behavior. So this article intends to establish the coupling model of MLDSB to reveal the range of parameter combination in the case of static bifurcation. The influences of different parameter groups on the singularity characteristics, phase trajectory, curves, and suction basin of the single DOF bearing system are analyzed. The result shows that there are nonzero singularities and static bifurcation occurs when or . As the flow of bearing cavity, coil current, oil film thickness, and galvanized layer thickness changes in turn, the singularities will convert between stable focus, unstable focus, stable node, and saddle point, and then the stable limit cycle may be generated. The attractiveness of singularity will change greatly with the flow of the bearing cavity and coil current changes slightly in the case of small current or large flow. The minimal change of galvanized layer thickness will lead to the fundamental change of the final stable equilibrium point of the rotor, while the final equilibrium point is slightly affected by the oil film thickness. This study can provide a reference for the supporting stability of MLDSB.

中文翻译：

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设计参数对电磁双悬浮轴承静态分叉行为的影响

磁性液体双悬浮轴承（MLDSB）包括电磁系统和静液压系统，可以大大提高轴承的承载能力和刚度。非常适合中速，重载和频繁启动的场合。由于电磁系统与静液压系统之间的相互耦合和相互作用，大大增加了静态分叉的可能性和程度，并降低了运行稳定性。轴承腔流量，线圈电流，油膜厚度和镀锌层厚度是确保运行安全稳定的关键参数，对静态分叉行为有重要影响。因此，本文旨在建立MLDSB的耦合模型，以揭示静态分叉情况下参数组合的范围。曲线，分析了单自由度轴承系统的吸盘。结果表明，当非奇异性为零时，会产生静态分叉。 或者 。随着轴承腔流量，线圈电流，油膜厚度和镀锌层厚度的变化，奇点将在稳定焦点，不稳定焦点，稳定节点和鞍点之间转换，从而可能产生稳定的极限循环。奇异的吸引力会随着轴承腔的流动而发生很大变化，而在小电流或大流量的情况下，线圈电流会略有变化。镀锌层厚度的最小变化将导致转子最终稳定平衡点的根本变化，而最终平衡点受油膜厚度的影响很小。该研究可为MLDSB的支撑稳定性提供参考。