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

1.本文研究了一个截面存在不圆度误差的静压气体轴承转子的径向跳动特性。研究了不圆度误差的叶数、轴承间隙和转子静载荷对系统的影响;实验结果验证了理论分析的正确性。2.介绍了轴承间隙流动的理论模型，其中，转子跳动发生的基本机制，3.从转子径向跳动的角度出发，提出了一种带周向槽的静压气体径向轴承。实验结果与理论计算结果吻合较好。4.引入理论流动模型，分析了静压气体导轨中轴承间隙内的气体流动。一些量，其可以代表转子或轴承垫的预期运动精度特性，5.分析了在转子或导轨存在随机分布的表面高度不规则加工误差的情况下，转子或轴瓦的运动精度特性通过这项研究工作。

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.