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

Figure 7

Fault diagnosis results of the proposed method and comparative methods: (a) PE-based sample set (1) with the use of an SVM. (b) PE-based sample set (2) with the use of an SVM, and (c) the proposed method.

(a)

(b)

(c)