Advances in Civil Engineering / 2019 / Article / Tab 4

Research Article

Monitoring and Identification of Vibration Frequencies on a Portion of México City Metro Line 12

Table 4

Identified frequencies and standard deviation by section in column 6 calculated for period before and after significant events.

Date periodRecursive N4SIDRecursive MOESPSpectral analysis

04/08/12–09/05/132.185.432.105.452.155.37
30/10/132.285.492.275.652.235.44
21/04/14–22/04/142.255.622.345.692.235.58

12/05/15–31/08/152.31 ± 0.045.64 ± 0.032.31 ± 0.135.65 ± 0.062.31 ± 0.045.62 ± 0.03
01/11/15–10/11/162.33 ± 0.045.60 ± 0.032.31 ± 0.095.62 ± 0.112.34 ± 0.045.58 ± 0.03
11/11/16–30/08/172.32 ± 0.035.60 ± 0.032.31 ± 0.115.62 ± 0.102.33 ± 0.035.59 ± 0.03
01/09/17–19/09/172.34 ± 0.025.66 ± 0.032.32 ± 0.115.68 ± 0.092.35 ± 0.035.64 ± 0.03
20/09/17–30/09/172.27 ± 0.025.59 ± 0.022.29 ± 0.095.61 ± 0.082.29 ± 0.025.60 ± 0.03
01/10/17–30/01/182.29 ± 0.045.59 ± 0.032.28 ± 0.085.61 ± 0.082.31 ± 0.025.57 ± 0.03
01/02/18–16/02/182.30 ± 0.045.59 ± 0.042.32 ± 0.085.61 ± 0.042.31 ± 0.025.57 ± 0.03
17/02/18–28/02/182.30 ± 0.025.56 ± 0.022.32 ± 0.095.58 ± 0.082.30 ± 0.035.56 ± 0.03

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