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Investigation of dynamic characteristics of a rotor system with surface coatings

机译：具有表面涂层的转子系统动力学特性研究

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摘要

A Jeffcott rotor system with surface coatings capable of describing the mechanical vibration resulting from unbalance and rub-impact is formulated in this article. A contact force model proposed recently to describe the impact force between the disc and casing with coatings is employed to do the dynamic analysis for the rotor system with rubbing fault. Due to the variation of penetration, the contact force model is correspondingly modified. Meanwhile, the Coulomb friction model is applied to simulate the friction characteristics. Then, the case study of rub-impact with surface coatings is simulated by the Runge-Kutta method, in which a linear interpolation method is adopted to predict the rubbing instant. Moreover, the dynamic characteristics of the rotor system with surface coatings are analyzed in terms of bifurcation plot, waveform, whirl orbit, Poincarfe map and spectrum plot. And the effects of the hardness of surface coatings on the response are investigated as well. Finally, compared with the classical models, the modified contact force model is shown to be more suitable to solve the rub-impact of aero-engine with surface coatings.
机译：本文提出了一种具有表面涂层的Jeffcott转子系统，该系统能够描述由于不平衡和摩擦冲击而引起的机械振动。最近提出的接触力模型用于描述圆盘和带有涂层的壳体之间的冲击力，用于对带有摩擦故障的转子系统进行动力学分析。由于穿透的变化，相应地修改了接触力模型。同时，采用库仑摩擦模型模拟了摩擦特性。然后，采用Runge-Kutta方法模拟了表面涂层的摩擦影响实例，其中采用线性插值法来预测摩擦瞬间。此外，还根据分叉图，波形，涡旋轨道，庞加菲图和频谱图分析了带有表面涂层的转子系统的动态特性。并研究了表面涂层硬度对响应的影响。最后，与经典模型相比，改进后的接触力模型更适合解决带有表面涂层的航空发动机的摩擦影响。

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