Joint Amplitude and Frequency Demodulation Analysis Based on Variational Mode Decomposition for Multifault Diagnosis of a Multistage Reducer

<div>Analysis results for worn sun gear and spur gear with broken teeth: (a) time-domain waveform of filtered vibration signal, (b) spectrum of filtered vibration signal, (c) envelope spectrum of filtered vibration signal, (d) time-domain and time-frequency VMD decomposition images, (e) envelope of VIMF1, and (f) envelope of VIMF3.</div>

Shock and Vibration

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Figure 9

Figure 9: Joint Amplitude and Frequency Demodulation Analysis Based on Variational Mode Decomposition for Multifault Diagnosis of a Multistage Reducer 

Figure 9 | Joint Amplitude and Frequency Demodulation Analysis Based on Variational Mode Decomposition for Multifault Diagnosis of a Multistage Reducer 