キャビテーションの影響を考慮した油潤滑スパイラル溝付ジャーナル軸受の動特性解析(機械要素,潤滑,工作,生産管理など)

概要

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Dynamic characteristics of an oil-lubricated spiral grooved journal bearing are investigated theoretically in this paper with considering the effect of cavitation occurrence in the bearing clearance. The equivalent flow model is applied to Reynolds equation expressed by the boundary-fitted coordinate system. The Reynolds equation is expanded by perturbation scheme with respect to the journal eccentricity, so that the dynamic bearing characteristics such as bearing stiffnesses and damping coefficients are calculated from the obtained results of perturbed pressure distributions. It is shown that, when the cavitation occurrence is taken into account, the value of the direct bearing stiffness becomes larger, while those of the cross-coupling bearing stiffness and damping coefficients become smaller, compared with those without considering the contribution of the cavitation occurrence. The effect of whirling velocity of the rotor to the bearing characteristics are also investigated, and the dynamic bearing characteristics are shown to be remarkably affected by the rotor whirling motion when the whirling velocity exceeds about half of rotational velocity of rotor. S table operating limits against "Half-Frequency Whirl" are discussed as well, showing that the critical mass values become larger when considering the cavitation occurrence than those without considering it.
社団法人日本機械学会の論文
2003-08-25