Analysis of Dynamic Stiffness and Damping of Partial Porous Aerostatic Thrust Bearings

Abstract:

Porous materials have been successfully used in an aerostatic bearing. In this paper, the dynamic stiffness and damping of partial porous aerostatic thrust bearings are analyzed by numerical calculation method. Firstly, the pressure distribution function of the bearing is divided into the static and dynamic pressure distribution functions through minor perturbation method. Then, the static and dynamic pressure distribution functions are calculated by FEM. Finally, the dynamic stiffness and damping coefficients of the bearing are solved. The result indicates that the dynamic stiffness increases obviously with the increment of supply pressure and first increases then decreases with the increment of frequency, and that there is negative damping in the low frequency band and the supply pressure has a great impact on the stability of the bearing.

• Periodical: Applied Mechanics and Materials (Volumes 16-19)
• Pages: 596-600
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.16-19.596
• Online since: October 2009
• Authors: Ya Zhou Sun, Xue Mei Yu, Hai Tao Liu, Ying Chun Liang
• Keywords: Aerostatic Bearing, Damping, Partial Porous, Stiffness

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