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Monitoring 3D vibrations in structures using high-resolution blurred imagery / David M.J. McCarhy in Photogrammetric record, vol 31 n° 155 (September - November 2016)  

Public [article]  inPhotogrammetric record > vol 31 n° 155 (September - November 2016) . - pp 304 - 324 Titre : Monitoring 3D vibrations in structures using high-resolution blurred imagery Type de document : Article/Communication Auteurs : David M.J. McCarhy, Auteur ; Jim H. Chandler, Auteur ; Alessandro Palmeri, Auteur Année de publication : 2016 Article en page(s) : pp 304 - 324 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre [Termes IGN] déformation d'édifice [Termes IGN] données localisées 3D [Termes IGN] image floue [Termes IGN] résistance des matériaux [Termes IGN] surveillance d'ouvrage [Termes IGN] test statistique [Termes IGN] vibration Résumé : (Auteur) Photogrammetry has been used in the past to monitor the laboratory testing of civil engineering structures using multiple image-based sensors. This has been successful, but detecting vibrations during dynamic structural tests has proved more challenging because they usually depend on high-speed cameras which often results in lower image resolutions and reduced accuracy. To overcome this limitation, a novel approach has been devised to take measurements from blurred images in long-exposure photographs. The motion of the structure is captured in individual motion-blurred images without dependence on imaging speed. A bespoke algorithm then determines each measurement point's motion. Using photogrammetric techniques, a model structure's motion with respect to different excitation frequencies is captured and its vibration envelope recreated in 3D. The approach is tested and used to identify changes in the model's vibration response. Numéro de notice : A2016-723 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12156 Date de publication en ligne : 18/09/2016 En ligne : https://doi.org/10.1111/phor.12156 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82251 [article]

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