格子形溝を有する静圧気体スラスト軸受の高減衰化設計法

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  • Design of High Damping Hydrostatic Gas Thrust Bearing with Grid-Shaped Grooves.
  • コウシガタ ミゾ オ ユウスル セイアツ キタイ スラスト ジクウケ ノ コウ

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In this study we propose a design of a new hydrostatic gas annular thrust bearing with grid-shaped grooves which can provide high damping ratio in a desired high-frequency region as well as high stiffness. The basic idea to increase the gas film damping at a high-frequency region is to form a set of small-width bearings in a high static pressure region so that high damping can be generated at high frequency, i.e., high squeeze number. In an ordinary annular thrust bearing configuration, higher maximum damping can generally be obtained when the bearing surface is divided not by radial grooves but by circumferential grooves. We can realize a high damping bearing at resonance frequency by choosing the groove number so as to tune σopt to the squeeze number corresponding to natural frequency and increasing the groove depth to the limiting value which keeps the damping positive in the low σ region.

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