2611 多孔質静圧気体ジャーナル軸受の動的特性および高速安定性に関する研究

概要

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Recently aerostatic porous bearings have been used in ultra precision machine tools and precision measuring equipments because they have higher stiffness and damping coefficient than another types of aerostatic bearings. Moreover, aerostatic bearings with porous restrictor have been successfully applied to high speed spindles for drilling small holes of printed circuit-boards. However, aerostatic porous bearings are prone to cause pneumatic hammer instability. Therefore, it is considered that reducing permeability of the bearing surface layer than that of the bulk of the porous material is very effective means for avoiding pneumatic hammer instability. In this paper, the dynamic characteristics and instability at high speeds of aerostatic porous journal bearings with a surface-restricted layer are investigated theoretically and experimentally.
一般社団法人日本機械学会の論文
2003-08-05