Multispectral Balanced Automatic Fault Diagnosis for Rolling Bearings under Variable Speed Conditions

Figure 12

Filtering process and results: (a) Protrugram kurtosis spectrum and optimal center frequency; (b) Protrugram; (c) each characteristic frequency is scaled according to the frequency conversion energy; (d) threshold and fault determination; (e) balanced envelope spectrum.

(a)

(b)

(c)

(d)

(e)