Research Article
A Damage Prognosis Method of Girder Structures Based on Wavelet Neural Networks
Table 1
Comparison of updated frequencies and measured frequencies, MAC values (unit, Hz).
| Model number | Measured frequencies ① | Updated frequencies ② | Relative error (②−①)/① (%) | MAC values (%) |
| beam-0 | | | | | First order | 33.62 | 32.78 | −2.5 | 93.1 | Second order | 135.03 | 130.78 | −3.1 | 91.4 | Third order | 293.03 | 293.02 | 0 | 95.5 | beam-1 | | | | | First order | 20.71 | 22.02 | 6.3 | 95.1 | Second order | 131.02 | 130.04 | −0.7 | 93.4 | Third order | 231.18 | 232.69 | −0.7 | 90.9 | beam-2 | | | | | First order | 18.90 | 19.46 | 2.9 | 96.7 | Second order | 85.94 | 90.67 | 5.5 | 94.3 | Third order | 202.54 | 203.07 | 0.3 | 90.8 | beam-3 | | | | | First order | 17.02 | 17.29 | 1.6 | 94.7 | Second order | 66.69 | 67.14 | 0.7 | 94.9 | Third order | 148.33 | 149.68 | 0.9 | 90.2 |
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