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

Figure 10

The frequency domain diagram of multiresolution DMD modes of the normal roller bearing signal, where (a)–(h) are corresponding to signals in Figure 6, respectively. The characteristic frequencies of the normal bearing signal are distributed in multiple modes, and these multiple modes jointly represent the features of the normal signals.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)