Experimental Investigations of Multiple Faults in Ball Bearing

摘要

Ball bearings are extensively used in many rotating machinery applications. Ball bearing failure is the main cause of breakdown of the rotating machineries. Local defects in ball bearing produced due to fatigue consist of cracks, pits and spalls on the rolling surfaces. Several researchers have studied the single fault in ball bearing, but in practice two or more faults (combined fault) are usually present. Fault diagnosis of a single row ball bearing has been extensively studied, however literature specific to double row ball bearings are sparse. This paper presents such cases, where single and multiple bearing faults of double row ball bearing are considered together. The objective is to experimentally investigate the single and multiple bearing faults of the inner race, outer race, cage and ball fault using envelope analysis. Envelope spectrum analysis is the best tool for bearing fault diagnosis like cracks and spalls in ball bearings. Bearing frequencies are excellently identified in the envelope spectrum.