Flow-difference feedback iteration method for aerostatic bearings

LI Yazhe; ZHOU Kai

doi:10.16511/j.cnki.qhdxxb.2017.26.051

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (9) : 980-985. DOI: 10.16511/j.cnki.qhdxxb.2017.26.051

MECHANICAL ENGINEERING

Flow-difference feedback iteration method for aerostatic bearings

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Abstract

Aerostatic bearings using air as the lubricant are especially useful in high-speed situations. This study of aerostatic bearings used a finite difference model of an aerostatic thrust bearing in polar coordinates based on the Reynolds equation with an improved flow-difference feedback iteration method. The relative error in the flow equilibrium updated by the iteration is used as the feedback variable to rectify the convergence rate factors. The initial value does not strongly influence the convergence rate, while the improved flow-difference feedback iteration method increases the effectiveness of the convergence rate factors. An analysis of the influence of the throttle parameter on the bearing performance shows that the proper orifices and clearance significantly improve the bearing stiffness.

Key words

flow-difference feedback iteration method / aerostatic thrust bearing / Reynolds equation / finite difference method (FDM)

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LI Yazhe, ZHOU Kai. Flow-difference feedback iteration method for aerostatic bearings[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(9): 980-985 https://doi.org/10.16511/j.cnki.qhdxxb.2017.26.051

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