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

Table 1

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	80 × 4	0.0018	92.1875 (295/320)
PE-based sample set (2) and SVM	20 × 7 × 4	80 × 7 × 4	0.0075	98.9286 (2216/2240)
Proposed method	20 × 4	80 × 4	7.00e − 04	100 (320/320)