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

Figure 17

Multiresolution DMD modes of the normal roller bearing signal (NASA, snapshot 2003.10.31.08.59.46). 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 18 and 19 share the same meaning.

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