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EnglishOptical measurements from high-speed, high-definition video recordings canbe used to define the full-field dynamics of a structure. By comparing thedynamic responses resulting from both damaged and undamaged elements,structural health monitoring can be carried out, similarly as with mountedtransducers. Unlike the physical sensors, which provide point-wise measure-ments and a limited number of output channels, high-quality video recordingallows very spatially dense information. Moreover, video acquisition is a non-contact technique. This guarantees that any anomaly in the dynamic behav-iour can be more easily correlated to damage and not to added mass orstiffness due to the installed sensors.However, in real-life scenarios, the vibrations due to environmental input areoften so small that they are indistinguishable from measurement noise if con-ventional image-based techniques are applied. In order to improve the signal-to-noise ratio in low-amplitude measurements, phase-based motion magnifica-tion has been recently proposed.This study intends to show that model-based structural health monitoring canbe performed on modal data and time histories processed with phase-basedmotion magnification, whereas unamplified vibrations would be too small forbeing successfully exploited. All the experiments were performed on amultidamaged box beam with different damage sizes and angles.
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| Titolo: | An experimental study of the feasibility of phase-based video magnification for damage detection and localisation in operational deflection shapes |
| Autori: | |
| Data di pubblicazione: | 2020 |
| Rivista: | |
| Digital Object Identifier (DOI): | 10.1111/str.12336 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| STRAIN-1499.R1_PROOF_24092019.pdf | 2. Post-print | PUBBLICO - Tutti i diritti riservati | Embargo: 31/01/2021 Richiedi una copia | |
| Civera_et_al-2020-Strain (1).pdf | 2a. Post-print Versione editoriale | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
http://hdl.handle.net/11583/2779308
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