Research Article
Application of Wavelet and EEMD Joint Denoising in Nonlinear Ultrasonic Testing of Concrete
Table 1
Characteristic indicators of the numerical signals after adding noise.
| SNR | RMSE | Amplitude of the fundamental A1 (mV) | Amplitude of the second harmonic A2 (mV) | Relative error A1 (%) | Relative error A2 (%) | Relative error (%) |
| 6.54 | 33.31 | 9293 | 2187 | 1.22 | 33.93 | 37.26 |
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