Background

Rub-impact of rotor–stator is one of the major problems for stability and safety of a rotating machine. As a result, the characterization of rub-impact force gradually becomes a crucial factor in the dynamic responses prediction of the rotor system.

Methods

First, the applicable scope of classical rotor–stator rub-impact force models is discussed in this paper. Then, taking a Jeffcott rotor as the research object, rub-impact force models under hard coating, soft coating and general condition are established respectively based on the equivalent linearized method. Finally, dynamic responses of the rotor system are numerically calculated by the linear interpolation method, and the change laws of impact stiffness are further analyzed under different conditions. Then, the effects of the engine coatings on the dynamic characteristics of the rotor system are studied in detail. By means of bifurcation diagram, time histories, whirling orbits, spectrum and impact force diagram, the dynamic variations are revealed.

Conclusions

The results suggest that the dynamic responses of system are closely related to the coating hardness. Meanwhile, the full annular rub and partial rub are affected by the coating hardness to a great extent.

中文翻译：

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考虑涂层效果和涂层硬度的单转子系统碰摩研究

背景

转子-定子的碰摩是旋转电机稳定性和安全性的主要问题之一。结果，摩擦力的表征逐渐成为预测转子系统动态响应的关键因素。

方法

首先，本文讨论了经典的转子－定子摩擦力模型的适用范围。然后，以Jeffcott转子为研究对象，基于等效线性化方法分别建立了硬涂层，软涂层和一般条件下的摩擦力模型。最后，通过线性插值法对转子系统的动力响应进行了数值计算，并进一步分析了不同条件下冲击刚度的变化规律。然后，详细研究了发动机涂层对转子系统动态特性的影响。通过分岔图，时间历史，回旋轨道，频谱和冲击力图，揭示了动态变化。

结论

结果表明，系统的动态响应与涂层硬度密切相关。同时，全环形摩擦和局部摩擦在很大程度上受涂层硬度的影响。