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http://dx.doi.org/10.9725/kts.2020.36.1.39

Effect of the Acceleration and Deceleration on the Dynamic Characteristics of an Air Stage  

Park, Sang Joon (Graduate School, Dept. of Mechanical Engineering, Yeungnam University)
Lee, Jae Hyeok (Graduate School, Dept. of Mechanical Engineering, Yeungnam University)
Park, Sang-Shin (School of Mechanical Engineering, Yeungnam University)
Kim, Gyu Ha (Tri-N Co., Ltd.)
Publication Information
Tribology and Lubricants / v.36, no.1, 2020 , pp. 39-46 More about this Journal
Abstract
Air stages are usually applied to precision engineering in sectors such as the semiconductor industry owing to their excellent performance and extremely low friction. Since the productivity of a semiconductor depends on the acceleration and deceleration performance of the air stage, many attempts have been made to improve the speed of the stage. Even during sudden start or stop sequences, the stage should maintain an air film to avoid direct contact between pad and the rail. The purpose of this study is to quantitatively predict the dynamic behavior of the air stage when acceleration and deceleration occur. The air stage is composed of two parts; the stage and the guide-way. The stage transports objects to the guideway, which is supported by an externally pressurized gas bearing. In this study, we use COMSOL Multiphysics to calculate the pressure of the air film between the stage and the guide-way and solve the two-degree-of-freedom equations of motion of the stage. Based on the specified velocity conditions such as the acceleration time and the maximum velocity of stage, we calculate the eccentricity and tilting angle of the stage. The result shows that the stiffness and damping of the gas bearing have non-linear characteristics. Hence, we should consider the operating conditions in the design process of an air stage system because the dynamic behavior of the stage becomes unstable depending on the maximum velocity and the acceleration time.
Keywords
air bearing stage; dynamic analysis; acceleration; deceleration; COMSOL;
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Times Cited By KSCI : 2  (Citation Analysis)
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