From: Attenuation Analysis of Lamb Waves Using the Chirplet Transform
distance | mode | mode | mode | mode | ||||
---|---|---|---|---|---|---|---|---|
 | CT | STFT | CT | STFT | CT | STFT | CT | STFT |
Synthetically generated signal | ||||||||
80/90 mm | 0.31 | 3.64 | 1.65 | 2.54 | 1.71 | 9.08 | 5.61 | 19.96 |
70/90 mm | 0.43 | 6.40 | 2.80 | 3.62 | 1.99 | 11.78 | 8.39 | 24.37 |
60/90 mm | 0.49 | 8.48 | 4.65 | 5.20 | 6.23 | 24.37 | 13.19 | 24.09 |
50/90 mm | 0.24 | 10.12 | 1.79 | 7.80 | 6.56 | 28.91 | 38.22 | 32.26 |
40/90 mm | 0.28 | 14.04 | 3.14 | 7.28 | 6.33 | 28.26 | 132.4 | 40.03 |
Experimentally generated signal | ||||||||
120/150 mm | 1.91 | 4.16 | 15.03 | 22.78 | 17.01 | 20.91 | 32.92 | 18.7 |
90/150 mm | 7.26 | 14.95 | 15.83 | 22.08 | 9.63 | 20.63 | 24.63 | 16.38 |
60/150 mm | 2.50 | 16.48 | 9.71 | 26.91 | 13.56 | 32.68 | 67.88 | 14.46 |
50/150 mm | 3.44 | 19.21 | 3.12 | 14.56 | 10.78 | 31.37 | 76.49 | 5.29 |