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Table 2 Average deviation in % from theoretical geometric attenuation.

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