A Fault Diagnosis Method for One-Dimensional Vibration Signal Based on Multiresolution tlsDMD and Approximate Entropy

Figure 6

Multiresolution DMD modes of a normal roller bearing signal. Here, we select the first column of that represents the fourth layer slow or fast modes. (a)–(h) represent the modes of , , , , , , , and , respectively. The symbols in the Figures 8–10 share the same meaning.

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