1985 年 28 巻 242 号 p. 1749-1755
This study deals with even multiple vibrations, namely, forced vibrations whirling with even multiple of the angular velocity of a drive shaft. A secondary moment is considered as the cause of the even multiple vibrations and its characteristics are investigated by analyses and experiments. The secondary moment is generated in a universal joint by loads against rotation of a driven shaft and it acts perpendicularly to the driven shaft. The loads consist of a constant resisting moment and a moment for the torsional vibration of the driven shaft based on the mechanism of universal joint. The even multiple vibrations due to the former load differ from those due to the latter load in characteristic.
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