ティルティングパッドジャーナル軸受の安定性に及ぼす油膜の傾斜ばね作用と傾斜減衰作用の影響(機械力学,計測,自動制御)

概要

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This paper studies the stability characteristics of tilting-pad journal bearings theoretically and experimentally. A tilting-pad journal bearing floating on a rotating rigid shaft was found to turn unstable beyond threshold shaft speeds, whirling with a subsynchronous frequency in the conical mode. The threshold shaft speeds were theoretically obtained for various operating conditions with the angular stiffness coefficients and the angular damping coefficients of the oil film due to the tilt motion of the bearing being considered. The predictions were found to agree well with measurements qualitatively. This unstable vibration of the bearing results from the cross-coupling terms of the angular stiffness coefficients much larger than the direct terms at higher Sommerfeld number. The threshold speeds were found to be insensitive to the variations of preload factor, which is contrary to the case of the parallel mode oil whip.
社団法人日本機械学会の論文
2006-10-25