径向螺旋槽空气轴承起飞速度与承载能力试验研究

Experimental Study on Takeoff Speed and Bearing Capacity ofRadial Spiral Groove Air Bearing

起飞转速是空气轴承的重要性能指标。以螺旋槽空气轴承为研究对象,运用摄动法求解等温可压缩条件下螺旋槽气体润滑轴承压力分布的微分方程,得到空气轴承压力分布及承载力等特性;以最大承载力为目标,计算螺旋槽空气轴承的结构参数,并对设计的空气轴承进行试验,探究其不同载荷下的起飞速度。试验结果表明:空载状态下,转速约为1 200 r/min时空气轴承的转子与轴承套脱离接触,达到起飞速度;螺旋槽空气轴承的起飞速度与起飞转矩均随着的载荷的增加而逐渐升高,随着转速的升高,轴承的承载能力也越来越大。研究表明所设计的螺旋槽空气轴承具有良好的性能,为后续螺旋槽轴承设计优化及实际应用提供了理论与实践基础。

Take-off speed is an important performance index of air bearing.Taking spiral groove air bearings as the research object,perturbation method was used to solve the differential equation of pressure distribution of spiral groove gas lubricated bearings under isothermal compressible conditions,and the pressure distribution and bearing capacity of air bearings were obtained.Aiming at the maximum bearing capacity,the structural parameters of the spiral groove air bearing were calculated,and the designed air bearing was tested to explore its take-off velocity under different loads.The test results show that,under no-load condition,when the rotating speed is about 1200 r/min,the rotor of the air bearing is out of contact with the bearing sleeve and the take-off speed is reached.The take-off speed and take-off torque both increase gradually with the increase of load,and the bearing capacity also increases with the increase of rotating speed.It is proved that the designed spiral groove air bearing has good performance,which provides the theoretical and practical basis for the subsequent design optimization and practical application of spiral groove bearing.