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Motion Error Analysis of the Porous Air Bearing Stages Using the Transfer Function  

박천홍 (한국기계연구원 공작기계그룹)
이후상 (한국기계연구원 공작기계그룹)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.7, 2004 , pp. 185-194 More about this Journal
Abstract
In order to analyze the motion errors of the aerostatic stage, it is necessary to consider the influence of the moment variation occurred inside the pads. In this paper, a motion error analysis method utilizing the transfer functions on the reaction force and moment is proposed, and general characteristics of the transfer functions are discussed. Calculated motion errors by the proposed method show good agreement with the ones calculated by Multi fad Method, which is considered the entire table as an analysis object. Also, by the introduction of the transfer function of motion errors, which represent the relationship between the spatial frequency components of the rail form error and motion errors, motional characteristics of the porous aerostatic stage can be generalized. In detail, the influence of the spatial frequencies is analyzed qualitatively, and the patterns of the insensitive frequencies which almost do not affect the linear motion error or angular motion error according to the rail length ratio and the number of the pad are verified. The relationship between the moment variation occurred inside the pads and the motion errors is also verified together.
Keywords
Motion error analysis; Porous air bearing; Transfer function; Spatial frequency; Ultra precision stage; Effect of moment;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
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