2013 Volume 7 Issue 4 Pages 619-629
When electrical pitting occurs, the sound level and vibration of a rolling bearing increase, and a ridge mark appears on the internal surface of the bearing. The frequency at which the sound and vibration increase is attributable to the undulation of the ridge mark formed on the surface. However, the phenomenon of electrical pitting was observed without the occurrence of a ridge mark. Therefore, in this research, the vibration acceleration was measured independently of the occurrence and nonoccurrence of a ridge mark. Then, the frequency at which the vibration acceleration increased was clarified experimentally. The conclusions are as follows. (1) Under the nonoccurrence condition of a ridge mark, multiple integral of frequency components for rotation speed increased. (2) In the occurrence condition of a ridge mark, the vibration acceleration increased in the frequency caused by the number of undulations per round for a ridge mark. (3) The number of undulations per round in the ridge mark and the frequency at which the vibration acceleration increased varied even when the experiments were performed under the same conditions.
