104 G. Busca et al. 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 x 10-5 Frequency [Hz] Amplitude Fig. 10.7 Time history of the 1st January 2011 Fig. 10.8 Spectrum of the 1st January 2011 Table 10.3 Others days of the empty stadium ID case Date A 18th March 2011 B 2nd February 2011 C 20th December 2012 In the following section, the adopted basic statistics to identify the behaviour of the structure related to different environmental and operational conditions is going to be described. Then, an explanation of the autoregressive model is provided to the purpose of identifying damage, also explaining our assumptions about the number of parameters, the duration of the considered data, and on the use of the Mahalanobis distance to manage the selected features.
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