Noise Analyses for Rolling Bearings

The paper refers to a noise analyses developed both in Matlab and Python environments in order to determine the failure of rolling bearings. The various types of vibration and sound in rolling bearings are grouped into the four categories: structural, manufacturing, handling and others (like lubricant noise, seal noise, etc.). There is known that any frequencies of vibration and sound generated in rolling bearings are related to the natural frequency of the raceway rings. Of the two raceway rings, the natural frequency of the outer ring becomes a problem more often than the inner ring due to a loose fit between it and the housing. The modes of vibration of the outer ring are roughly divided into two categories: those that consider the outer ring as a rigid body and those that consider it as an elastic body. There are several formulas for calculating the natural frequency of the bending mode in the outer ring of a ball bearing. The authors developed an experimental setup for study the noise behaviour of rolling bearings: normal or damaged bearings. Both bearings have operated on the experimental setup successively and the noises were recorded. Comparing the frequencies behaviour of the two bearings a conclusion could be set.