Time synchronous averaging of ball mill vibrations

Abstract This note presents an investigation into the problems of ball mill pinions. Pinion pitch measurements and vibration analysis were conducted to find a relationship between vibration signals and the errors. Analysis of time synchronous averaging (TSA) indicates the teeth with pitch error. TSA and sideband index (measure of sidebands in spectrum) allows the first estimation of the pinion quality and could be applied for commissioning new pinions and gears, and also in a routine procedure for progressive machine condition assessment. Valuable information on the gear condition is obtained from the sideband index.