PSI - Issue 64

Jiantao Li et al. / Procedia Structural Integrity 64 (2024) 500–506 Author name / Structural Integrity Procedia 00 (2019) 000–000

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in Figs. 3 and 4, respectively. The figures show that the identified vehicle axle responses and CP displacement responses agree well with the true values.

Fig. 3. Identified axle displacement responses of the VBI system

Fig. 4. Identified CP responses of the VBI system

The bridge displacement response could also be evaluated from the response residual of the CP responses at contact points of the front and rear wheels (He et al., 2023). The response residual is that the CP response at the contact point of the rear axle subtracts that of the front axle with a time shifting of S/v (axle distance divided by vehicle speed). Fig. 5 shows the response residual of CP responses under two vehicle axles and its Fourier spectrum. It can be seen that the bridge frequency of first mode can be clearly identified at the value of 0.64Hz.