Numerical analysis and experimental research on self-excited micro-vibration of aerostatic thrust bearings

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 224-232.

LONG Wei1，WANG Jiyao1， LI Fashe2， WU Mimi1， DENG Wei3

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Abstract

With the continuous improvement of control accuracy and working stability, the self-excited vibration in the air film of aerostatic bearing has become the key problem restricting the further development of air flotation system. Taking the three-dimensional self-excited micro-vibration in the film of disc type central air supply orifice throttle air hydrostatic bearing as the research object, the dynamic model and self-excited vibration equation of the film were established based on the fluid lubrication theory and the modified velocity slip boundary. Based on the plane flow function and the large eddy simulation method, the characteristics of three-dimensional gas vortex vorticity distribution and the variation of velocity field were analyzed on the basis of determining the formation mechanism of gas film microvibration. Finally, the time domain and frequency domain characteristics of gas film self-excited micro-vibration in triaxial direction were tested by experiments, and the influencing factors of each axial self-excited micro-vibration were analyzed. The results showed that the self-excited vibration of the aerostatic thrust bearing is formed by three-dimensional gas vortexs in the film flow field, and the vibration intensity along the film height direction (z direction) is significantly higher than that in the horizontal plane (x, y direction). The intensity of self-excited vibration in the three directions of bearing film increases with the increase of gas supply pressure, and the intensity of self-excited vibration in x and y directions are more sensitive than that in z direction.The natural frequency of the self-excited vibration in the x and y directions will increase with the increase of the gas supply pressure. While that in z direction is basically unchanged with the increase of gas supply pressure.

Key words

aerostatic bearing / self-excited microvibration / large eddy simulation / three-dimensional gas vortex / vorticity distribution

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LONG Wei1，WANG Jiyao1， LI Fashe2， WU Mimi1， DENG Wei3. Numerical analysis and experimental research on self-excited micro-vibration of aerostatic thrust bearings[J]. Journal of Vibration and Shock, 2019, 38(16): 224-232

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