鋼球の音響寿命 (第1報)

音響寿命における鋼球表面形状の変化

抄録

The sound pressure level and the vibration acceleration increase with the revolution of theball bearing. In this report, the cause of this phenomenon was investigated from the change of the shape of steel ball. And, the shape characteristic of the steel ball was measured by the newly developed six bands type wavometer. The results obtained are summarized as follows :
(1) Under the uniform revolution of the ball bearing, when the load is increased, the sound pressure level and the vibration acceleration attain the higher saturation values in short period.
(2) The sound life can be expressed both by the total number of revolution until the saturation value is attained, and by the saturation value. Under the routine loading condition, it was found that the sound life was less than 10⁶ cycles.
(3) It was also found that the increasing phenomena of the sound pressure level and the vibration acceleration were caused by the irregularity of the steel ball surface, especially by the higher order component of the waviness.