Crack Signal Analysis with Waveform and CWT Time-Frequency Plots

The left column in the figure displays waveform plots of various crack signals. The time values corresponding to waveform mutations are marked above each plot. The right column presents the corresponding CWT time-frequency plots. Notably, the uppermost section of the CWT time-frequency plot exhibits almost no signal frequency. This observation suggests that higher frequency ranges contain fewer signals, indicating lower energy levels and fewer corresponding frequencies. Therefore, it can be inferred that the frequencies associated with crack faults fall within the medium to high-frequency range.