PSI - Issue 54

Francisco Afonso et al. / Procedia Structural Integrity 54 (2024) 553–560 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

559

7

Fig. 6. Final point cloud detail

It is worth noting that before any trial, small tests were done with the system in place, to define the acquisition parameters, as they are ambient light dependent. 6. Conclusions A system that is able to capture visual data from previously identified areas of interest, starts and ends retaining walls acquisitions automatically according to the GPS data and is placeable inside a locomotive, was successfully developed. Its structure is able to support the photogrammetric system while attached to a lateral window of the locomotive. The different types of conducted trials were crucial to understand the typical values to expect from the aforementioned main key parameters of the developed system. Point clouds of good quality and detail were obtained both from initial trials conducted inside a moving car and in the final trial inside a moving locomotive. Acknowledgements This work was developed in the scope of the project FERROVIA 4.0, nº 46111 which has received funding from “ANI - Agência Nacional de Inovação, S.A” through the programme “Mobilizador COPROMOÇÃO_PT2020”. References Baqersad, J., Poozesh, P., Niezrecki, C., & Avitabile, P. (2017). Photogrammetry and optical methods in structural dynamics – A review. Mechanical Systems and Signal Processing, 86, 17 – 34. Bertin, S., Friedrich, H., Delmas, P., & Chan, E. (2013). On the Use of Close-Range Digital Stereo Photogrammetry to Measure Gravel-Bed Topography in a Laboratory Environment. 35th IAHR World Congress.