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Effect of Surface Waviness on the Performances of an Aerostatic Thrust Bearing with Orifice-Type Restrictor
International Journal of Precision Engineering and Manufacturing ( IF 1.9 ) Pub Date : 2021-08-05 , DOI: 10.1007/s12541-021-00567-1
Hui Zhuang 1 , Jianguo Ding 1 , Peng Chen 1 , Yu Chang 1 , Xiaoyun Zeng 2 , Hong Yang 2 , Xingbao Liu 2 , Wei Wei 2
Affiliation  

In this paper, four waviness types are presented to investigate the effect of surface waviness on the static performance, dynamic performance and stability of an aerostatic thrust bearing with orifice-type restrictor. The influences of wave amplitude and rotational speed on the bearing performances are studied. The Reynolds equation is first solved through small perturbation method to obtain the static and dynamic characteristics. Subsequently, by adopting an iterative method based on the acquired dynamic coefficients, a numerical method is proposed to analyze the bearing stability. The calculated critical supply pressure is compared with that obtained by the traditional orbit method and it indicates that the proposed method has higher computational efficiency. The results show that the surface waviness has great influence on the bearing performances and the effect becomes increasingly pronounced with the growth of wave amplitude. The performances are more sensitive to the waviness arranged in bearing radial direction than circumferential direction. The enhancement of certain performance is always accompanied by the decline of another performance for the bearing with wave pattern on the surface, which leads to the fact that the bearing performances cannot be comprehensively improved in static characteristic, dynamic characteristic and stability. Besides, high rotational speed will cause pneumatic instability more readily. Finally, a stiffness measuring experiment and a modal test are performed to verify the accuracy of computational analysis and results.



中文翻译:

表面波纹度对带孔板节流器的空气静力推力轴承性能的影响

在本文中,提出了四种波纹类型,以研究表面波纹对带孔板式限流器的空气静力推力轴承的静态性能、动态性能和稳定性的影响。研究了波幅和转速对轴承性能的影响。雷诺方程首先通过小扰动法求解,得到静态和动态特性。随后,基于获得的动态系数采用迭代方法,提出了一种数值方法来分析轴承的稳定性。将计算得到的临界供给压力与传统轨道法得到的临界供给压力进行比较,表明该方法具有更高的计算效率。结果表明,表面波纹度对轴承性能的影响很大,并且随着波幅的增大,这种影响越来越明显。性能对轴承径向排列的波纹度比圆周方向更敏感。对于表面带有波浪纹的轴承,某些性能的提高总是伴随着另一种性能的下降,从而导致轴承在静特性、动特性和稳定性方面的性能无法得到全面提高。此外,高转速更容易引起气动不稳定。最后,进行了刚度测量实验和模态试验,以验证计算分析和结果的准确性。

更新日期:2021-08-10
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