Research Article
Monitoring and Identification of Vibration Frequencies on a Portion of México City Metro Line 12
Table 1
Identified frequencies and standard deviation using ambient vibration record 2013.
| Frequency | Spectral analysis (time-window 40 s) | N4SID | MOESP | Spectral analysis (time-window 10 s) |
| f1 | 2.19 | 2.21 ± 0.01 | 2.27 ± 0.001 | 2.26 ± 0.10 | f2 | 5.71 | 5.64 ± 0.03 | 5.80 ± 0.004 | 5.58 ± 0.13 |
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