Study on Precision Design of Externally Pressurized Gas-Lubricated Bearing and Guide Way

1.实验研究了外压气轴承支承转子的横截面存在过圆度误差时的跳动特性。研究了叶片圆度误差数、轴承间隙和转子静载荷的影响；实验结果证实了理论分析的有效性。介绍了轴承间隙内流动的理论模型，阐明了圆度误差引起转子跳动的基本机理。从转子跳动的角度出发，提出了一种带周向沟槽的外压气体轴颈轴承。实验结果与理论结果吻合较好。通过引入理论流动模型，分析了外压气体润滑导轨轴承间隙内的气体流动。提出了一些可以表示转子或轴承座的预期运动精度特性的量。分析了转子或导轨存在表面高度不规则且随机分布的加工误差情况下转子或轴瓦的运动精度特性。本文的研究为外压气体轴承系统的精密设计理念奠定了理论基础。

1.The run-out characteristics of a rotor, which has out-of-roundness error in its crosssection, and is supported by an externally pressurized gas bearing, are investigated experimentally. The effects of number of lobes of out-of-roundness error, the bearing clearance, and the static load applied to the rotor are studied ; the experimental results confirm the validity of the theoretical analysis.2.Theoretical models for the flow in the bearing clearance are introduced, by which the essential mechanisms of occurence of rotor run-out by the out-of-roundness error are clarified.3.An externally pressurized gas journal bearing with circumferential grooves is proposed from the view point of run-out of the rotor. Experimental results show comparatively good agreements with theoretical ones for this type of the bearing.4.The gas flow in the bearing gap in an externally presurized gas-lubricated guide way is analyzed by introducing theoretical flow models. Some quantities, which may represent the expected moving accuracy characteristics of the rotor or the bearing pad, are proposed.5.The moving accuracy characteristics of the rotor or the bearing pad are analyzed under the condition that the rotor or the guide way rail have machining errors of surface height irregularities with random distibution.6.Theoretical background of precision design concept of externally pressurized gas bearing system may be established by this study work.