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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]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-2016031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Deck and cable dynamic testing of a single-span bridge using radar interferometry and videometry measurements / George Piniotis in Journal of applied geodesy, vol 10 n° 1 (March 2016)  

Public [article]  inJournal of applied geodesy > vol 10 n° 1 (March 2016) . - pp 87 - 94 Titre : Deck and cable dynamic testing of a single-span bridge using radar interferometry and videometry measurements Type de document : Article/Communication Auteurs : George Piniotis, Auteur ; Vassilis Gikas, Auteur ; Thanassis Mpimis, Auteur ; Harris Perakis, Auteur Année de publication : 2016 Article en page(s) : pp 87 - 94 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] appariement d'images [Termes IGN] auscultation d'ouvrage [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] pont [Termes IGN] séquence d'images [Termes IGN] vibration [Termes IGN] vidéo numérique Résumé : (auteur) This paper presents the dynamic testing of a roadway, single-span, cable-stayed bridge for a sequence of static load and ambient vibration monitoring scenarios. Deck movements were captured along both sideways of the bridge using a Digital Image Correlation (DIC) and a Ground-based Microwave Interfererometer (GBMI) system. Cable vibrations were measured at a single point location on each of the six cables using the GBMI technique. Dynamic testing involves three types of analyses; firstly, vibration analysis and modal parameter estimation (i. e., natural frequencies and modal shapes) of the deck using the combined DIC and GBMI measurements. Secondly, dynamic testing of the cables is performed through vibration analysis and experimental computation of their tension forces. Thirdly, the mechanism of cable-deck dynamic interaction is studied through their Power Spectra Density (PSD) and the Short Time Fourier Transform (STFT) analyses. Thereby, the global (deck and cable) and local (either deck or cable) bridge modes are identified, serving a concrete benchmark of the current state of the bridge for studying the evolution of its structural performance in the future. The level of synergy and complementarity between the GBMI and DIC techniques for bridge monitoring is also examined and assessed. Numéro de notice : A2016-556 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2015-0030 En ligne : http://dx.doi.org/10.1515/jag-2015-0030 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81711 [article]

Examining the influence of changing laser pulse repetition frequencies on conifer forest canopy returns / Laura Chasmer in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 12 (December 2006)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 12 (December 2006) . - pp 1359 - 1367 Titre : Examining the influence of changing laser pulse repetition frequencies on conifer forest canopy returns Type de document : Article/Communication Auteurs : Laura Chasmer, Auteur ; Christopher Hopkinson, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1359 - 1367 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] ALTM [Termes IGN] canopée [Termes IGN] données lidar [Termes IGN] données multitemporelles [Termes IGN] forêt boréale [Termes IGN] fréquence [Termes IGN] impulsion laser [Termes IGN] lasergrammétrie [Termes IGN] onde radioélectrique [Termes IGN] Pinophyta [Termes IGN] surface du sol [Termes IGN] télémétrie laser aéroporté [Termes IGN] vibration Résumé : (Auteur) The distribution of laser pulses within conifer forest trees and canopies are examined by varying the rate of laser pulse emission and the inherent laser pulse properties (laser pulse energy, pulse width, pulse length, and roll-over or trigger time). In this study, an Optech, Inc. ALTM 3100 airborne lidar is used, emitting pulses at 50 kHz and 100 kHz, allowing for changes in laser pulse characteristics while also keeping all other survey parameters equal. We found that: 1. Pulses and associated characteristics emitted at 50 kHz penetrated further into the canopy than 100 kHz for a significant number of individual trees. 2. At tall tree plots with no understory, pulses emitted at 50 kHz penetrated further into the canopy than 100 kHz for a significant number of plots. 3. For plots with significant understory and shorter trees, pulses emitted at 100 kHz penetrated further into the canopy than 50 kHz. We suspect that this may be due, in part, to canopy openness. Laser pulse energy and character differences associated with different laser pulse emission frequencies are likely a contributing factor in laser pulse penetration through the canopy to the ground surface. Efforts to understand laser pulse character influences on canopy returns are important as biomass and vegetation structure models derived from lidar are increasingly adopted. Copyright ASPRS Numéro de notice : A2006-544 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.72.12.1359 En ligne : https://doi.org/10.14358/PERS.72.12.1359 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28267 [article]

Determination of characteristic site period and preliminary ground response analysis according to resonance by using GIS / M. Tun in GIS Geo-Informations-Systeme, vol 2004 n° 9 (September 2004)

Public [article]  inGIS Geo-Informations-Systeme > vol 2004 n° 9 (September 2004) . - pp 31 - 36 Titre : Determination of characteristic site period and preliminary ground response analysis according to resonance by using GIS Type de document : Article/Communication Auteurs : M. Tun, Auteur ; Ugur Avdan, Auteur ; M. Altan, Auteur Année de publication : 2004 Article en page(s) : pp 31 - 36 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] bâtiment [Termes IGN] milieu urbain [Termes IGN] résonance [Termes IGN] risque naturel [Termes IGN] séisme [Termes IGN] système d'information géographique [Termes IGN] Turquie [Termes IGN] vibration Résumé : (Auteur) Ground response analyses are mostly used for the development of design response spectra in the modern earthquake engineering. After 1999 Marmara Earthquake, the damages were mostly related with unavailable soil conditions and this unavailability were analysed according to liquefaction analysis. In this study, granular soil which the Eskisehir urban area is located has been studied according to vibration period. Eskisehir is the city, which would be influenced negatively by the earthquake due to unavailable soil conditions and uncontrolled constructions. Five different districts of the Eskisehir municipality were included in this studied area. Characteristic site period (Ts), which is defined as the period of vibration corresponding to the fundamental frequency has been obtained for each 32 test points. GIS which is a powerful tool and technique for especially earth science, has been used for the preparation of characteristic site period map (Tf) of the studied area. After that, the number of story of each building has been determined by in-situ studies in the studied districts. Numéro de notice : A2004-405 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26932 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
058-04091	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Rapport de la 2ème session (octobre 2001) / Bureau international des poids et mesures (2002)  

Public Titre : Rapport de la 2ème session (octobre 2001) Titre original : Report of the 2nd meeting (October 2001) Type de document : Rapport Auteurs : Bureau international des poids et mesures , Auteur ; Organisation intergouvernementale de la convention du metre, Auteur ; Comité consultatif de l'acoustique, des ultrasons et vibrations, Auteur Editeur : Sèvres : Bureau International des Poids et Mesures BIPM Année de publication : 2002 Collection : Rapports du Comité consultatif de l'acoustique, des ultrasons et des vibrations, ISSN 1606-3759 num. 02 Importance : 94 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-92-822-2193-8 Langues : Anglais (eng) Français (fre) Descripteur : [Vedettes matières IGN] Métrologie [Termes IGN] acoustique [Termes IGN] mesurage [Termes IGN] ultrason [Termes IGN] vibration Index. décimale : 24.40 Métrologie Numéro de notice : 11981 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Rapport d'activité En ligne : https://www.bipm.org/fr/search?p_p_id=search_portlet&p_p_lifecycle=2&p_p_state=n [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=40109

Rapport de la 1ère session juillet 1999 / Bureau international des poids et mesures (2000)  

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Figure de la Terre / F. Chambat (1996)

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Cours de physique générale à l'usage de l'enseignement supérieur scientifique et technique / Georges Bruhat (1992)

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Optique géométrique, ondulatoire et polarisation avec exercices et problèmes résolus / J.P. Perez (1991)

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An adaptive noise smoothing filter for remotely-sensed images with microphonic noise / S. Cheng in International Journal of Remote Sensing IJRS, vol 10 n° 6 (June 1989)  

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Physique, terminale, CE / A. Saison (1980)

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Dynamique générale des vibrations / Y. Rocard (1971)

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Vibrations, propagation, diffusion / M. Soutif (1970)

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La physique en MP-PC 1ère année et dans les classes préparatoires aux grandes écoles scientifiques, 5. Volume 5, Mécanique : vibrations, ondes / P. Alais (1969)

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Images optiques / Pierre Fleury (1968)

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