Fault Feature Extraction Method of Rolling Bearing Based on IAFD and TKEO

Table 1

Single indicators.

Indicators	Formulas	Implication
SNR		SNR is the ratio of useful signal to noise signal. It can be used to measure the quality of the signal. Generally speaking, the signal quality is greater the higher the signal-to-noise ratio, where displays the initial signal, symbolizes the signal that was rebuilt, and represents the mean of the original signal
PRD		PRD identifies the variation between the original and recreated signals. The quality of the reconstructed signal often improves with a decreasing root mean square error percentage