Table 3.

Representation of the grouping of the feature matrices computed by means of analyzing the vibration signals in TD, FD and TFD for each supply frequency for the considered bearing conditions; where the notations HC and BD represent the healthy condition and the bearing damaged condition.

		Feature Domain
		Time	Frequency	Time–Frequency
Related condition	Normal	T1 @5Hz@HC	F1 @5Hz@HC	TF1 @5Hz@HC
		T1 @15Hz@HC	F1 @15Hz@HC	TF1 @15Hz@HC
		T1 @50Hz@HC	F1 @50Hz@HC	TF1 @50Hz@HC
		T1 @60Hz@HC	F1 @60Hz@HC	TF1 @60Hz@HC
	Damaged	T1 @5Hz@BD	F1 @5Hz@BD	TF1 @5Hz@BD
		T1 @15Hz@BD	F1 @15Hz@BD	TF1 @15Hz@BD
		T1 @50Hz@BD	F1 @50Hz@BD	TF1 @50Hz@BD
		T1 @60Hz@BD	F1 @60Hz@BD	TF1 @60Hz@BD
Grouped matrices		T1 group	F1 group	TF1 group