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A study on accuracy of porous journal air bearing
Precision Engineering ( IF 3.6 ) Pub Date : 2020-07-14 , DOI: 10.1016/j.precisioneng.2020.06.011
Penghai Zhang

In order to predict error motion of continuous porous journal air bearing, an accuracy model is established to reveal the relationship among error motion, roundness error and structure parameter under quasi-static conditions. Based on the model, averaging coefficient is defined to quantitatively characterize the error averaging ability. The study finds that whether the bush and shaft roundness errors match is the cause of error motion. The trilobal roundness error of shaft has a major impact on accuracy for a porous journal air bearing with an elliptical bush, while the elliptical roundness error of shaft has a major impact on accuracy for that with a trilobal bush. On the two-dimensional plane of bush wave numbers n2 = 2~7 and shaft wave numbers n1 = 2~15, the averaging coefficients are symmetrical along the line n1 = n2. The shaft wave numbers which equal integer multiples of prime numbers of bush wave number have no impact on accuracy, while the remaining shaft wave numbers have impact. Among them, those at points n1 = n2*i ± 1 are with obvious averaging coefficients and have a major impact on accuracy where i is a positive integer. The main peaks of averaging coefficients appear at the points n1 = n2 ± 1, which have the most important impact on accuracy. The theory has many potential applications such as prediction of error motion, structural optimization and selection of parts grinding method, which is of significant importance for design and testing of porous journal air bearings used widely in ultra-precision machine tools.



中文翻译:

多孔轴颈空气轴承精度的研究

为了预测连续式多孔轴颈空气轴承的误差运动,建立了一个精确模型,揭示了在准静态条件下误差运动,圆度误差和结构参数之间的关系。基于该模型,定义平均系数以定量表征误差平均能力。研究发现,轴套和轴的圆度误差是否匹配是误差运动的原因。轴的三叶形圆度误差对带有椭圆形衬套的多孔轴颈空气轴承的精度有重要影响,而轴的椭圆形圆度误差对带有三叶形衬套的多孔轴颈空气轴承的精度有很大影响。在布什波数n 2  = 2〜7和轴波数n 1的二维平面上 = 2〜15时,平均系数沿n 1  =  n 2线对称。等于布什波数素数的整数倍的轴波数对精度没有影响,而其余的轴波数有影响。其中,在点n 1  =  n 2 * i ±1处的那些具有明显的平均系数,并且在i为正整数的情况下,对精度有重大影响。平均系数的主峰出现在点n 1  =  n 2±1,这对精度有最重要的影响。该理论具有许多潜在的应用,例如误差运动的预测,结构优化和零件磨削方法的选择,这对于广泛用于超精密机床的多孔轴颈空气轴承的设计和测试具有重要意义。

更新日期:2020-07-14
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