An Enhancement Deep Feature Extraction Method for Bearing Fault Diagnosis Based on Kernel Function and Autoencoder

Table 3

The mean and standard deviation of the test results.

Method	Average of accuracy (%)			Standard deviation of accuracy (%)
	Ex 1	Ex 2	Ex 3	Ex 1	Ex 2	Ex 3
The proposed method	86.75	99.50	98.00	2.70	0.75	2.01
Standard SAE	44.90	96.35	43.45	4.45	1.40	5.25
Standard DBN	19.65	92.55	12.50	7.09	2.46	4.33
The proposed method with PK	24.25	87.30	86.15	4.40	0.87	6.15
The proposed method with PEK	65.55	98.80	97.15	6.66	0.93	2.23

Ex 1: Experiment 1; Ex 2: Experiment 2; Ex 3: Experiment 3.