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

Figure 5

The Frequency domain diagram of CWRU signals, where (a)–(d) are corresponding to signals in Figure 5, respectively. The characteristic frequency distinction of each fault form is quite obvious, especially in (a) and (b) for the normal signal and the inner race fault signal. It is easy to find out the AM frequency in (b). However, there are a lot of interference frequency components in the spectrum of the roller fault signal and outer race fault signal, as in (c) and (d). Moreover, the FM components (by the cage frequency) of the ball frequency cannot be detected.

(a)

(b)

(c)

(d)