回転軸系の自励振動に関する研究(第1報) : 実験

概要

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In this paper, both structural and internal damp-ing values are estimated, and relation between them and the generation of self-excited vibration are described. In these .experiments, a rotating shaft system with one rotor at the middle of axis was used. Every test rotor is horizontally sup-ported between two ball bearings. Small damped vibration was generated by impressing an impact on the test rotor for the conditions of non-rotating, rotating at various speed, and especially at critical speed. From the impulsive response wave form obtained, the structural damping 'Fi' and internal damping 'Ct' could be estimated. The main results obtained are as follows : (1) The larger the structural damping of the rotating shaft system is, the estimated value of internal damping become larger, so that self-excited vibration is apt to be generated. (2) Self-excited vibration can be prevented, if the ratio of structural damping is less than about 10. (3) If the ratio of internal damping and external damping is made less than O.41,the selfexcited vibration can be prevented.
公益社団法人精密工学会の論文
1983-05-05