Abstract

A vibration analysis method for detecting abnormalities by analyzing a vibration waveform. The method includes the steps of, in a plurality of observation time points {t j } composed of a number n of specified time points t j (j=1 to n) counted from a start time point t 0 , detecting displacements of a vibration wave f j (j=1 to n) at the individual time points of the plurality of observation time points, and comparing points in an n-dimensional space composed of the displacements, detected at the individual observation time points, with points in the n-dimensional space of a vibration waveform that are designated as being normal.

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