DETECTION OF SIMULATION JOURNAL BEARING WEAR USING VIBRATION ANALYSIS

摘要

The paper examines the sources of vibration in rotating machines. The conversion of machine vibration into an electrical signal by transducers for purposes of measurement and analysis is presented in the first part of the report. These transducers, or vibration pickups, are discussed with regard to their construction and applicability. The second part of this paper investigates the detection of simulated bearing wear in a refrigeration compressor using vibration analysis. For the experiment, connecting-rod bearings in a Dunham-Bush reciprocating compressor were bored oversize to simulate bearing wear. The resulting compressor vibrations picked up by an accelerometer were analyzed to detect changes in the vibration signal. The power spectral density of the vibration signal was computed. The results indicate that an increase in the connecting-rod bearing clearances is detectable in the power spectral density plot of the accelerometer output.