Unstable Vibrations of the Shaft Carrying an Unsymmetrical Rotating Body : Vibrations Induced by Flexibility of Bearing Pedestals

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概要

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• In the lateral vibrations of a shaft mounted by an unsymmetrical rotating body, a free vibration of frequency p_i always appears with another free vibration of frequency p_i=2ω-p_i. 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 p_i, p_i and small dissimilarity in spring constants result in new zones of instability. These zones appear at the rotating speed ω where the relation p_i=-p_i or p_i=p_i=2ω-p_i holds. In the zones, the motions are dynamically unstable, and the amplitudes of the vibrations with frequencies p_i, p_j, p_i, p_j grow up exponentially.

• 一般社団法人日本機械学会の論文

著者

• Yamamoto Toshio

  Faculty Of Engineering Nagoya University

• Yamamoto T.

  Faculty of Agriculture, Yamagata University

• Ota Hiroshi

  Faculty Of Engineering Nagoya University

• Ota Hiroshi

  Faculty Of Engineering Gunma University

• Yamamoto T.

  Faculty of Engineering Nagoya University

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