Crack Signal Denoising Using db12 Wavelet Decomposition: A Comparative Study

This study explores the use of db12 wavelet basis function for denoising crack signals. The signal is decomposed into 3, 4, and 5 layers, and the denoising effects are visually presented in Figure 4. To quantify the performance, Signal-to-Noise Ratio (SNR) and Root Mean Square Error (RMSE) are calculated for each decomposition level. The results demonstrate that the 3-layer decomposition achieves the most favorable denoising effect, as evidenced by the highest SNR and lowest RMSE values.