| 摘要 |
PROBLEM TO BE SOLVED: To perform vibration analysis and phase analysis of vibration waveforms using dynamic statistical averaging of tachometer data to accurately calculate rotational speed.SOLUTION: Vibration analysis is performed on a machine having a variable frequency drive by using a tachometer to monitor rotational speed of a drive shaft and a logic device to calculate speed parameters associated with the drive shaft using tachometer data. The speed parameters include a maximum speed, a minimum speed, and an average speed of the drive shaft. By correlating vibration spectra of a motor drive with the speed parameters, machine faults can be identified based upon energy distribution in the spectra. Further, vibration waveforms from two or more locations on the machine can be sequentially acquired through synchronous triggering by using a pulse edge of a stable tachometer signal. The waveforms can be compared to determine a phase difference to help in identifying any machine faults that may be present.SELECTED DRAWING: Figure 1 |
