すべり軸受でささえられた回転軸系の振動について : 第1報, 不つりあい振動について

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タイトル別名
  • On the Vibration of a Rotating Shaft Supported by Journal Bearings : 1st Report, Unbalance Vibration
  • スベリ ジクウケ デ ササエラレタ カイテンジクケイ ノ シンドウ ニ ツイテ 1

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The unbalance vibration of a rotating shaft supported by cylindrical journal bearings is reported in this paper. Elastic and damping properties of oil-film bearings of finite length are obtained using a digital computer from Reynolds equation for two dimensional flow with squeezefilm effect. These properties play a very important role in limiting the vibration amplitude to a small value and in reduction of the critical speeds. Elastic and damping properties of oil-film have nonlinear characteristics, and if their non-linearity is neglected in the calculation, the unbalance vibration may result in by far larger amplitude at resonance than the actual case, unless the static displacement of the journal center from the bearing center it large in comparison with the amplitude of the journal center. If the nonlinear characteristics are taken into consideration, the vibrational behavior will be estimated in good approximation to experimental results.

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