柔軟回転軸の摩擦振動における中間支持の影響

抄録

A long flexible shaft such as a lance tube in a soot blower and a drillstring in a rotary drilling system exhibits friction-induced vibration resulting in a whirling motion. This paper investigates the behavior of a vertical flexible shaft whirling due to the frictional force and examines the effect of an intermediate support on the whirling motion. The experimental system investigated has a vertical shaft which rotates at a constant speed by means of a motor mounted at the top end of the shaft. The bottom end of the shaft is located at the center of a rubber ring so that the frictional force acts when the shaft is deflected. The results of the experiment clarifies the frequency and amplitude of the whirl at various speed of the shaft rotation as well as an effective position of the intermediate support for suppressing the vibration.