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Vibration Analyses of a Gantry Structure by Mobile Phone Digital Image Correlation and Interferometric Radar †

1
Department of Civil and Environmental Engineering, University of Florence, Via di Santa Marta 3, 50139 Firenze, Italy
2
Department of Earth Sciences, University of Rome “Sapienza”, P. le Aldo Moro 5, 00185 Rome, Italy
3
NHAZCA S.r.l., Start-Up University of Rome “Sapienza”, Via V. Bachelet n.12, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
This paper is an extended version of our conference paper: Mugnai, F.; Tucci, G.; Da Re, A. Digital Image Correlation in Assessing Structured-Light 3D Scanner’s Gantry Stability: Performing David’s (Michelangelo) High-Accuracy 3D Survey. Int. Arch. Photogramm. Remote. Sens. Spat. Inf. Sci.2021, 46, 463–469.
Academic Editor: Bruce D. Chapman
Geomatics 2022, 2(1), 17-35; https://doi.org/10.3390/geomatics2010002
Received: 9 December 2021 / Revised: 21 December 2021 / Accepted: 24 December 2021 / Published: 27 December 2021
The study presents results from applying the Real Aperture Radar interferometry technique and Digital Image Correlation through a mobile phone camera to identify static and dynamic deformations of a gantry during surveying operations on the Michelangelo’s David at the Galleria dell’Accademia di Firenze Museum in Florence. The statue has considerable size and reaches an elevation of more than seven meters on its pedestal. An ad-hoc gantry was designed and deployed, given the cramped operating area around the statue. The scanner had a stability control system that forbid surveying in instrument movements. However, considering the unicity of the survey and its rare occurrence, the previous survey had been carried out in the year 2000; verifying stability and recording deformations is a crucial task, and necessary for validation. As the gantry does not have an on-board stability sensor, and considering the hi-survey accuracy requested, a redundant, contactless, remote monitoring system of the gantry and the statue stability was chosen to guarantee the maximum freedom of movement around the David to avoid any interference during scanning operations. Thanks to the TInRAR technique, the gantry and the statue were monitored with an accuracy of 0.01 mm. At the same time, a Digital Image Correlation analysis was performed on the gantry, which can be considered a Multi-Degree-Of-Freedom (MDOF) system, to accurately calculate the vibration frequency and amplitude. A comparison between TInRAR and DIC results reported substantial accordance in detecting gantry’s oscillating frequencies; a predominant oscillation frequency of 1.33 Hz was identified on the gantry structure by TinSAR and DIC analysis. View Full-Text
Keywords: TInRAR; Digital Image Correlation; RARAD interferometry TInRAR; Digital Image Correlation; RARAD interferometry
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MDPI and ACS Style

Mugnai, F.; Cosentino, A.; Mazzanti, P.; Tucci, G. Vibration Analyses of a Gantry Structure by Mobile Phone Digital Image Correlation and Interferometric Radar. Geomatics 2022, 2, 17-35. https://doi.org/10.3390/geomatics2010002

AMA Style

Mugnai F, Cosentino A, Mazzanti P, Tucci G. Vibration Analyses of a Gantry Structure by Mobile Phone Digital Image Correlation and Interferometric Radar. Geomatics. 2022; 2(1):17-35. https://doi.org/10.3390/geomatics2010002

Chicago/Turabian Style

Mugnai, Francesco, Antonio Cosentino, Paolo Mazzanti, and Grazia Tucci. 2022. "Vibration Analyses of a Gantry Structure by Mobile Phone Digital Image Correlation and Interferometric Radar" Geomatics 2, no. 1: 17-35. https://doi.org/10.3390/geomatics2010002

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