非対称回転体の不安定振動 : 軸受台のたわみに基因する振動

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タイトル別名
  • Unstable Vibrations of the Shaft Carrying an Unsymmetrical Rotating Body
  • ヒタイショウ カイテンタイ ノ フアンテイ シンドウ ジクウケダイ ノ タワミ ニ キインスル シンドウ

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抄録

In the lateral vibraticns of a shaft mounting an unsymmetrical rotating body, a free vibration of frequency p^-i allways appears with another free vibration of frequency pi=2ω-pi. When the bearing pedestals are somewhat flexible, e.g., in y direction, there are small differences in spring constants between x and y directions. Coexistence of pi, p^-i and the small dissimilarity in spring constants result in the new zones of instability. These zones appear at the rotating speed ω where the relation pi=-pj or pi-pj=2ω. In the zones, the motions are dynamically unstable, and the amplitudes of the vibrations with frequencies pi, pj, p^-i, p^-j grow up exponentially.

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