Bearing Early Fault Diagnosis Based on an Improved Multiscale Permutation Entropy and SVM

Table 2

Diagnostic results of different feature extraction methods.

Feature extraction	1	2	3	4	Total accuracy (%)
Wavelet [40]	78	79	75	76	77
Wavelet [41]	83	81	79	84	81.75
PE	95	85	90	95	91.25
MPE	100	95	90	95	95
IMPE	100	95	95	100	97.5