S1104-3-1 外部弾性・減衰要素の非線形性がヘリングボーン動圧気体軸受の安定性に及ぼす影響(トライボロジーの基礎と応用3)

概要

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It is well known that viscoelastic supports is an efficient way to improve the stability of journal bearings. However, inappropriate bearing supports decrease the stability threshold. A theory with considering the nonlinearity of external spring and damping elements can predict well whether the stability of bearing systems improve or not. The present paper describes the effect of the frequency dependence of the bearing support elements on the stability of herringbone grooved aerodynamic journal bearings. Several types of nonlinear properties were expressed by giving values to the unknown coefficients in an empirical fomula. Results show that too large spring coefficients in high frequency regions deactivate the advantage of the viscoelastic supports. Additionally, the stability threshold increases as the nonlinear ratio of the damping increases.
2009-09-12