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http://dx.doi.org/10.9725/kstle.2006.22.2.093

Finite Difference Analysis of Dynamic Characteristics of Negative Pressure Rectangular Porous Gas Bearings  

Hwang Pyung (School of Mechanical Engineering, Yeungnam University)
Khan Polina (Department of Mechanical Engineering, Graduate School, Yeungnam University)
Lee Chun-Moo (Department of Mechanical Engineering, Graduate School, Yeungnam University)
Kim Eun-Hyo (Department of Mechanical Engineering, Graduate School, Yeungnam University)
Publication Information
Tribology and Lubricants / v.22, no.2, 2006 , pp. 93-98 More about this Journal
Abstract
The numerical analysis of the negative pressure porous gas bearings is presented. The pressure distribution is calculated using the finite difference method. The Reynolds equation and Darcy's equation are solved simultaneously. The air bearing stiffness and damping are evaluated using the perturbation method. Rectangular uniform grid is employed to model the bearing. The vacuum preloading is considered. The pressure in the vacuum pocket is assumed to be a constant negative pressure. The total load, stiffness, damping and flow rate are calculated fur several geometrical configurations and several values of negative pressure. It is found that too large vacuum pocket can result in negative total force.
Keywords
FDM; negative pressure porous bearing; perturbation method;
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