Feature Extraction Strategy with Improved Permutation Entropy and Its Application in Fault Diagnosis of Bearings

Table 2

Diagnosis results of comparison experiments.

Items	Training samples	Test samples	Time (train and test) (s)	Total (%)
PE-based sample set (1) and SVM	20 × 4	40 × 4	0.0022	52.5 (84/160)
PE-based sample set (2) and SVM	20 × 12 × 4	40 × 12 × 4	0.0455	67.5521 (1297/1920)
Proposed method	20 × 4	40 × 4	8.55e-04	96.875 (155/160)