METHOD FOR DIAGNOSING ABNORMALITY OF DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an abnormality diagnosing method for a device having a movable component, capable of grasping easily whether a condition of the device is normal or not (abnormal). SOLUTION: A raw waveform as to vibration of the device is normalized to find a normalized waveform. A data of the normalized waveform is fast- Fourier-transformed (FFT) to find a data of a frequency component, i.e., a power spectrum. A data as to vibration of the device under a normal condition is preliminarily found by the same manner. Abnormality diagnosis for the device is conducted based on a remaining power spectrum provided by subtracting a power spectrum in the normal contition from the power spectrum in the diagnosis.