4自由度クラックロータの理論解析 : 水平軸の主危険速度付近の振動

概要

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Vibration characteristics of a cracked horizontal shaft at the major critical speed are investigated theoretically. A model with 4 degrees of freedom is adopted. The results are compared with both the theoretical results of a 2-degree-of-freedom model and the experimental results of a 4-degree-of-freedom system which were reported previously. The following is clarified. (a) In the case of a comparatively large unbalance, the shape of the resonance curve changes markedly depending on the relative angular position of the unbalance to the crack. An unstable region appears for a certain range of the angular position. (b) In the case of a comparatively small unbalance, the shape of the resonance curve is not affected by the direction of the unbalance and an unstable region always appears. (c) The results of a 4-degree-of-freedom model agree qualitatively with the results of a 2-degree-of-freedom model and the experimental results.
社団法人日本機械学会の論文
1993-10-25