Figure 9. Example of normalized amplitude of the pump ID: 06 at − 6 dB SNR, frequency in time domain ( top row), Figure 9. Example of normalized amplitude of the pump ID: 06 at − 6 dB SNR, frequency in time domain (top row), and and corresponding power spectrogram ( bottom row) on normal condition ( left column) and anomalous condition ( right corresponding power spectrogram (bottom row) on normal condition (left column) and anomalous condition (right column). column).