气旋现象对气体静压轴承微振动影响的实验

气体静压轴承是气浮系统的重要组成元件，其气膜自激微振动会降低气浮系统的工作精度和刚度特性。为了进一步提高气体静压轴承的工作精度和稳定性,在分析轴承内部气膜波动形成机理的基础上,开展了数值计算及实验研究。不仅验证了气旋分布规律和气旋中心压降的存在可靠性,并且有力证明了气膜支撑区域内沿流动方向存在的分区现象。结合实验进一步分析了影响高压区气旋强度和分布位置的可能因素。结果表明:供气压力、供气孔径和气腔结构都分别对气旋的位置和强度有各自不同的影响规律；而主气旋的核心位置和内外压差造成的压力脉动又会直接决定气体静压轴承微振动的强度和频率特征。 

Experiment on effect of gas vortex on micro vibration of aerostatic bearing

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.