Enhanced Bearing Fault Detection Using Step-Varying Vibrational Resonance Based on Duffing Oscillator Nonlinear System

Figure 11

Analysis results for the bearing signal with a defective outer race: (a) original signal; (b) envelope signal with a filtering band at 3000–3750 Hz; (c) optimal MSTSR output signal (optimal parameters: , , , and ); (d) optimal WSSR output signal (optimal parameters: , , , and ); (e) optimal WSGSR output signal (optimal parameters: , , , , , and ); and (f) optimal SVVR output signal (optimal parameters: , , , , , and  rad/s).

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