PSI - Issue 64

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Kun Feng et al. / Procedia Structural Integrity 64 (2024) 596–603 Kun Feng et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 3. Variational mode decomposition, (a) 1 st – 5 th IMF, (b) relevant frequencies, (c) 6 th – 10 th IMF, (d) relevant frequencies. In Step 3, the ' ℎ ' function in MATLAB is employed to derive the analytic signal from the 10 th IMF, as illustrated in Fig. 3. Furthermore, as demonstrated in Fig. 4, the analytic signal's magnitude represents the complex envelope of the initial signal. Consequently, the absolute magnitude of this analytic signal is utilized to construct the ODS curve for a healthy bridge, which is depicted in Fig. 4(b).

Fig. 4. ODS calculating based on the 10 th IMF.