Fig. 8

Time waveforms and spectra of vibration signals in the UoC gearbox failure dataset. (a) Time waveform of the noise-free raw vibration signal. (b) Frequency spectrum of the noise-free raw vibration signal. (c) Time waveform of the noise-containing vibration signal (SNR = 0). (d) Frequency spectrum of the noise-containing vibration signal (SNR = 0).