Research on Dynamic Characteristics of Aerostatic Thrust Bearings Based on Perturbation Method

doi:10.3969/j.issn.1000-1093.2016.01.022

Abstract

Abstract: An aerostatic thrust bearing with pressure-equalizing groove with variable sectional area is designed to research the dynamic characteristics of aerostatic thrust bearing. Based on the mechanical vibration model of gas bearings, the dynamic control equations of gas bearings is established by using perturbation method, and the dynamic control equations are sovled to obtain the dynamic stiffness and damping of gas bearings by the finite difference method. The results show that the dynamic and static stiffness values of aerostatic thrust bearings are equal when the vibration is small, and the dynamic and static stiffnesses of gas bearings reach the optimum value when the gas film thickness is about 5.5 μm; the dynamic damping decreases nonlinearly with the increase in gas film thickness at the same air supply pressure, and the gas film thickness greatly affects the dynamic damping coefficients of air bearings.

Key words: mechanics, gas bearing, perturbation, dynamic stiffness, dynamic damping, finite difference

CLC Number:

TH133.36

LU Zhi-wei, MA Fang-jie, LIU Bo, ZHANG Jun-an. Research on Dynamic Characteristics of Aerostatic Thrust Bearings Based on Perturbation Method[J]. Acta Armamentarii, 2016, 37(1): 150-155.

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