A Study on Coupling Faults’ Characteristics of Fixed-Axis Gear Crack and Planetary Gear Wear

Figure 7

Vibration characteristics when the excitation frequency is 3.5 in normal state: (a) time domain, (b) phase diagram, (c) Poincaré section, (d) frequency domain, and (e) frequency refinement spectrum.

(a)

(b)

(c)

(d)

(e)