As a crucial element of air support system

selfexcited microvibration of gas film in aerostatic bearing could reduce the measurement accuracy and stiffness characteristics of the working system simultaneously. In order to further improve the working precision and stability of the aerostatic bearing

numerical calculation and experiment were carried out based on the study of formation mechanism of the microvibration of gas film in aerostatic bearing. The research conclusions not only verified the gas vortexs distribution law and existing pressure drop but also validated distinct zoned phenomenon of gas film along flow direction. Combined with a series of experiments to analyze the ties between intensity and location of gas vortex

main factors were summarized. The results showed that both location and intensity of the gas vortex were affected by supply pressure

inlet diameter and feed pocket structure respectively. Furthermore

the pressure fluctuation caused by pressure difference of main gas vortex was in direct relation to microvibration intensity and frequency response of aerostatic bearing.