フルイドダンパを付加した静圧気体スラスト軸受の軸の応答特性

概要

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In this paper, the shaft response characteristics of hydrostatic thrust gas bearings with fluid damper are described. In hydrostatic gas bearings, the both clearances at which stiffness reaches its maximum value and damping reaches its minimum value are well known to be at almost the same. Therefore, when an impact force acts on the shaft, the shaft response behavior of vibration generally shows under damping, and it takes several times of the natural period in convergence. So, the possibility of reducing convergence time is examined by the use of fluid damper. Following conclusions are obtained : (1) The shaft convergence behavior of vibration can be improved (from under damping to critical damping) by changing the damping coefficient of fluid damper. (2) The shaft convergence can be achieved in about one natural period. (3) The optimum damping coefficient of fluid damper is set at 0.6-1.0 of damping factor in the bearing system. (4) Fluid damper can be of great help to make high stiffness gas bearings with large pocket in the bearing surface without causing pneumatic hammer instability.
公益社団法人精密工学会の論文
1991-05-05