周期分布压力腔的小孔节流圆形静压气体轴承静动态特性研究

Study of Static and Dynamic Characteristics of a Circular Aerostatic Bearing with Periodic Orifice Restrictors and Feed Pockets

利用摄动法研究了沿周向周期分布压力腔的小孔节流圆形静压气体轴承的静动态特性。通过有限差分法求解稳态雷诺方程和扰动雷诺方程,计算了轴承静承载力和静刚度及动刚度和阻尼系数,分析了扰动频率对轴承动态性能的影响,并对轴承的稳定性进行了分析。研究结果表明:扰动频率对轴承动态性能有较大影响;轴承的稳定性与气膜间隙、供气压有关,供气压越大,轴承稳定性越差,随着气膜间隙增大,稳定性先减弱后增强。

In this paper,acircular aerostatic bearing with periodic orifice restrictors and feed pockets is studied and the static and dynamic characteristics of the bearing are investigated through the perturbation method.The steady Reynolds equation and the perturbed Reynolds equation are solved using the finite difference method.The static load capacity and stiffness,dynamic stiffness and dynamic damping coefficients are obtained numerically.Effects of the perturbation frequency on the dynamic stiffness and dynamic damping coefficients,as well as stability of the bearing,are analyzed.Our results indicate that stability of the bearing depends on the gas-film thickness and the supply pressure.As the supply pressure increases,the gas bearing becomes less stable.With the increase of the gas-film thickness,stability of gas bearing first increases and then decreases.