弾性支持された偏平回転軸系の主危険速度付近における不安定振動

概要

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This paper deals with an unsymmetrical rotating shaft supported by a flexible base. In this system, the rotor is mounted in the middle of the shaft, and the base is movable in a direction transversal to the shaft. We analyze the unstable vibration near the major critical speed, taking into account the effects of damping. From a theoretical analysis, the unstable region is found to be divided into at most six zones which depend on the mass of the base, the stiffness of the base, and the unsymmetry of the shaft. Two types of vibration modes are clearly shown to exist in these divided, unstable zones. In addition, the resonance curves are calculated. It is found that there exist two shapes of resonance curves near unstable zones. In experiments, we obtained five types of response curves which contained n unstable zones (n=1, 2,…, 5) near the major critical speed by changing the mass of the base. We obtained good agreement between the theoretical values and the experimental results.
社団法人日本機械学会の論文
1993-10-25