PSI - Issue 17

João Morais et al. / Procedia Structural Integrity 17 (2019) 448–455 João Morais et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 6. Vertical deformation obtained with the vision system during one passage of the vehicle (E-W direction). Positive Y values imply a downward deformation of the railway track.

Fig. 7 shows the collected data with the on-board displacement transducers, regarding the same vehicle passage as showed on Fig. 6. The right side data corresponds to the instrumented rail, showing the compatibility between the results obtained with both methods. The data presented here regarding the two displacement transducers located in the vehicle middle section are already processed according to the methodology described in chapter 2. Here the resonant response of the middle displacement transducers is visible. While this behaviour is undesirable, average values can still be calculated to extract the resulting railway deformation.

Fig. 7. Vertical deformation obtained with the laser displacement transducers during one passage of the vehicle (E-W direction). Positive Y values imply that the displacement transducers are closer to their targets.

Based on the acquired data, the results demonstrate the feasibility of the embedded system to measure railway deformations in quasi-static regime. Relevant considerations regarding railway defects detection were not possible