Fault Diagnosis of Rolling Element Bearing Based on Vibration Frequency Analysis

Element bearing is one of the widely used universal parts in machine. Its running condition and failure rate influence the performance, service life and efficiency of the equipment directly. So it is significant to research on bearing condition monitoring and fault diagnosis techniques. The paper describes the use of vibration measurements by a periodic monitoring system for monitoring the condition of rolling element bearing of the centrifugal machine. Vibration data is collected using accelerometers, which are placed at the 12 o´clock position at both the drive end and the driven end of the centrifugal machine. Vibration signals are collected using a 16 channel DAT recorder, and are post processed by vibration signals analysis software in personal computer. Simple diagnosis by vibration is based on frequency analysis. Each element of rolling bearing is of its fault characteristic frequency. This paper introduces frequency analysis method of using low and high frequency bands in conjunction with time domain waveform. Fault position of drive end bearing in the centrifugal machine is detected successfully by using this method.