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J4  2012, Vol. 46 Issue (4): 616-621    DOI: 10.3785/j.issn.1008-973X.2012.04.007
Theoretical and experimental study on pressure characteristics of
air film for levitation using porous media
ZHONG Wei1, LIU Hao1, TAO Guo-liang1, LI Xin2, KAGAWA Toshiharu2
1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;
2. Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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A pressure dynamic model including the characteristics of porous media and gap flow was established within a representative region in order to analyze the air film pressure characteristics of pneumatic levitation using porous media, as for performance analysis and optimal design of non-contact conveying system. The model was solved by using finite volume method (FVM). Results showed that there exists an obvious pressure hysteresis versus gap thickness when a work piece was vibrated back and forth to squeeze the air film, revealing that the pressure response was identified as a representation of spring-damping characteristic. Theoretical and experimental results showed that the dynamic model based calculated results accorded well with the experimental data. Pressure stiffness coefficient of the air film increased greatly as a gap thickness decreased, and varied with the supply flow rate as well as the region radius. Pressure damping coefficient little changed with the supply flow rate, but apparently affected by the region radius, indicating that the decay of free vibration of the work piece can be accelerated by appropriately increasing the width of the conveyor.

Published: 17 May 2012
CLC:  TH 138  
Cite this article:

ZHONG Wei, LIU Hao, TAO Guo-liang, LI Xin, KAGAWA Toshiharu. Theoretical and experimental study on pressure characteristics of
air film for levitation using porous media. J4, 2012, 46(4): 616-621.

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