【摘要】 为研究不同润滑介质对气体静压轴承气锤自激振动的影响，耦合时变的气膜流场控制方程、流量平衡方程和转子受力方程建立了轴承系统的单自由度气锤振动模型。利用有限差分法数值求解模型，得出气膜振动速度瞬态响应曲线用来判定轴承稳定性，并通过试验验证了模型的可靠性和程序的有效性。计算结果表明：使用氙气可以有效降低气锤自激振动的发生；对于氙气和空气的混合气体，随着氙气体积比的增大，气膜振动速度曲线衰减趋势加强轴承稳定性提高，轴承支撑力增大，且供气压力越高支撑力增大幅度越大；当氙气体积比从0增大到0.6时，轴承支撑力快速增大，临界供气压力也持续提高，当氙气体积比超过0.6后，轴承支撑力和临界供气压力增长缓慢，结合成本考虑，氙气体积比为0.6可作为最佳体积比。该研究为气体静压轴承气锤自激振动的抑制提供了新思路。更多还原

【Abstract】 In order to study the influence of different lubricating media on the self-excited vibration of the pneumatic hammer of an aerostatic bearing, a single-degree-of-freedom vibration model of the bearing system was established by coupling the time-varying governing equation of the gas film flow field, the flow balance equation, and the rotor force equation.The finite difference method was used to numerically solve the model, and the transient response curve of gas film vibration velocity was obtained to determine the stability of the bearing, and the reliability of the model and the validity of the program were verified through experiments.Calculation results show that the use of xenon can effectively reduce the occurrence of self-excited vibration of thepneumatic hammer; for the mixed gas of xenon and air, as the volume ratio of xenon increases, the attenuation trend of the gas film vibration velocity curve is strengthened, and the stability of the bearing is improved, the supporting force of the bearing is improved, and the higher the gas supply pressure, the greater the range of support force increases. When the xenon volume ratio increases from 0 to 0.6, the bearing supporting force increases rapidly, and the critical gas supply pressure also continues to increase. When the xenon volume ratio exceeds 0.6, the bearing support force and critical gas supply pressure increase slowly. Considering the cost, the xenon volume ratio of 0.6 can be used as the optimal volume ratio. This study provides a new idea for the suppression of self-excited vibration of pneumatic hammer of aerostatic bearing.更多还原