Change in Frequency of AE Signals by Interposition of Foreign Body Particles in Rolling Bearing

Abstract

Since bearings are used for rotating parts in dynamic machinery, the integrity diagnosis becomes very important in order to maintain the operating state in the machinery. Although there are various methods for the diagnosis of bearings, an acoustic emission (AE) measurement that detects elastic stress waves when a material is deformed and fractured can be applied on assessing damage in rolling bearings. By paying attention to the frequency changes in the AE signal waveforms according to the changes in friction and wear mode, predicting possible failure in rolling bearings is possible. In this study, endurance tests of rolling bearings were examined focusing on the changes in the frequency spectrum of the AB signals, as well as the effects of foreign body particles (metallic particles and hard particles) in bearings.