Issue 49

S. Djaballah et alii, Frattura ed Integrità Strutturale, 49 (2019) 291-301; DOI: 10.3221/IGF-ESIS.49.29 297 Configuration Neural network The configuration chosen is the following: - 3-layer network: 1 single hidden layer; - 10 neurons in the hidden layer; - Performance error = 10 -8 . We have the database has 180 signals for each rolling condition Among the 720 signals, 60% and 40% are exploited for learning the RNA test respectively. The results showed in Tab. 3, for the three families of wavelets, which the best classification rates are obtained with the classification rate, are obtained with the level 3 of decomposition. In addition, Daubechies wavelets db1, db2, db3, db6, db7 and db8 have the best performance in terms of fault classification rates. Using the wavelets db1, db2, db3, db6, db7 and db8, with which the best performances are obtained, were performed the neuron classification algorithm 100 times and the results obtained are reported in Tab. 4. wavelet Level 3 4 5 6 7 db1 99.21 98.17 97.91 90.88 79.68 db2 99.21 96.61 97.13 88.80 83.33 db3 99.21 97.39 98.17 89.84 86.45 db4 97.91 97.39 95.83 92.70 88.80 db5 98.17 97.13 97.39 90.88 79.94 db6 99.21 97.91 95.57 93.48 86.19 db7 99.21 96.87 96.61 90.62 89.58 db8 99.21 96.61 97.39 91.66 88.80 db9 96.87 98.17 97.39 90.36 76.04 db10 97.39 97.39 97.13 90.10 82.81 db11 98.43 96.61 96.61 92.18 80.20 db12 98.95 97.91 96.35 89.32 86.45 db13 98.43 97.65 97.91 91.40 85.93 db14 98.17 99.21 96.61 89.58 87.50 db15 97.65 98.69 97.39 91.92 89.84 db16 97.39 97.39 95.57 91.66 84.11 db17 98.17 97.91 98.17 90.36 82.81 db18 96.09 97.91 97.65 89.84 90.66 db19 98.69 97.39 97.31 92.96 75.00 db20 98.17 96.35 97.65 91.40 83.66 db30 98.17 97.39 97.65 90.88 87.50 db40 98.69 97.91 98.43 95.50 80.20 db44 98.17 98.17 97.39 96.09 85.84 Coif 1 98.69 97.39 94.27 89.48 79.16 Coif 2 98.17 97.13 97.13 91.66 84.63 Coif 3 97.91 97.39 95.57 86.13 85.93 Coif 4 98.17 96.09 94.01 85.15 82.81 Coif 5 99.21 96.09 93.22 86.45 75.00 Sym 2 98.43 97.13 97.39 89.06 76.04 Sym 3 97.65 98.43 97.13 93.22 85.93 Sym 4 98.95 98.43 97.39 90.62 87.50 Sym 5 98.95 98.43 97.13 92.44 89.84 Sym 6 98.17 97.65 95.57 90.62 83.07 Sym 7 98.69 96.87 95.83 89.06 80.20 Sym 8 98.17 96.09 96.61 91.92 84.11 Sym 9 98.95 98.43 96.35 92.44 80.20 Sym 10 98.17 96.61 94.27 82.03 75.00 Sym 15 98.17 97.65 97.13 93.22 76.04 Table 3 : Classification rates for different types of wavelet and different levels of decomposition