Planetary Gearbox Fault Diagnosis via Torsional Vibration Signal Analysis in Resonance Region

Figure 13

Planet gear fault signal analysis: (a) detrended torsional vibration signal, (b) Fourier spectrum, (c) envelop spectrum, (d) IMFs, (e) instantaneous frequencies of IMFs, and (f) Fourier spectrum of instantaneous frequency.

(a)

(b)

(c)

(d)

(e)

(f)