Research Article
Feature Clustering Analysis Using Reference Model towards Rolling Bearing Performance Degradation Assessment
Figure 6
The PDA results for the full cycle life of the tested bearings: (a) the feature RMS (f3), (b) the feature kurtosis (f6), (c) the feature frequency energy ratio (f9), (d) the 1st PC feature, (e) the T2 chart, and (f) the indicator RMS_EWMA (RE).
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