Log in

Relevant bibliographies by topics / Guided ultrasonic waves / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Guided ultrasonic waves.

Dissertations / Theses on the topic 'Guided ultrasonic waves'

Author: Grafiati

Published: 10 May 2025

Last updated: 26 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Guided ultrasonic waves.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Pavlakovic, Brian Nicholas. "Leaky guided ultrasonic waves in NDT." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/7907.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Bartoli, Ivan. "Structural health monitoring by ultrasonic guided waves." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3283893.

Full text

Abstract:

Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed December 3, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 311-325).

APA, Harvard, Vancouver, ISO, and other styles

3

Ghandourah, E. I. I. "Large plate monitoring using guided ultrasonic waves." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1463979/.

Full text

Abstract:

Areas of stress concentration around welded structures are likely to lead to fatigue cracks and corrosion pitting during the life time of technical machinery. Performing periodical non-destructive testing of the critical area is crucial for the maintenance of structural integrity and the prevention of unforeseen shutdowns of the system. Low frequency guided ultrasonic waves can propagate along thin structures and allow for the efficient testing of large components. Structural damage can be localized using a distributed array of guided ultrasonic wave sensors. Guided waves might be employed to

APA, Harvard, Vancouver, ISO, and other styles

4

Vallet, Quentin. "Predicting bone strength with ultrasonic guided waves." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066626.

Full text

Abstract:

Cette thèse s'inscrit dans le cadre du développement d'une sonde ultrasonore afin d'obtenir des nouveaux biomarqueurs de l'os cortical et améliorer la prédiction du risque de fracture. Notre approche se base sur la mesure des ondes guidées ultrasonores dans l'os cortical. La technique de transmission axiale bidirectionelle a été utilisée pour mesurer les modes guidées se propageant dans l'enveloppe corticale des os longs (i.e., le radius). Les propriétés matérielles et structurelles liées à la résistance osseuse ont été obtenues à partir des courbes de dispersion en utilisant un schéma d'inver

APA, Harvard, Vancouver, ISO, and other styles

5

Vallet, Quentin. "Predicting bone strength with ultrasonic guided waves." Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066626.

Full text

Abstract:

Cette thèse s'inscrit dans le cadre du développement d'une sonde ultrasonore afin d'obtenir des nouveaux biomarqueurs de l'os cortical et améliorer la prédiction du risque de fracture. Notre approche se base sur la mesure des ondes guidées ultrasonores dans l'os cortical. La technique de transmission axiale bidirectionelle a été utilisée pour mesurer les modes guidées se propageant dans l'enveloppe corticale des os longs (i.e., le radius). Les propriétés matérielles et structurelles liées à la résistance osseuse ont été obtenues à partir des courbes de dispersion en utilisant un schéma d'inver

APA, Harvard, Vancouver, ISO, and other styles

6

Valle, Christine. "Guided circumferential waves in annular structures." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17271.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Belanger, Pierre. "Feasibility of thickness mapping using ultrasonic guided waves." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5503.

Full text

Abstract:

Detection and sizing of corrosion in pipelines and pressure vessels over large, partially accessible areas is of growing interest in the petrochemical and nuclear industries. Traditionally, conventional ultrasonic thickness gauging and eddy current techniques have been used to precisely measure the thickness in structures. These techniques only allow the measurement of the local thickness under the probe. Consequently obtaining the remnant thickness of a specimen over a large area requires the probe to be scanned, which is a long and tedious process. Moreover, with these techniques, the scanni

APA, Harvard, Vancouver, ISO, and other styles

8

Buys, B. J. "Rock bolt condition monitoring using ultrasonic guided waves." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-06222009-135318/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Levine, Ross M. "Ultrasonic guided wave imaging via sparse reconstruction." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51829.

Full text

Abstract:

Structural health monitoring (SHM) is concerned with the continuous, long-term assessment of structural integrity. One commonly investigated SHM technique uses guided ultrasonic waves, which travel through the structure and interact with damage. Measured signals are then analyzed in software for detection, estimation, and characterization of damage. One common configuration for such a system uses a spatially-distributed array of fixed piezoelectric transducers, which is inexpensive and can cover large areas. Typically, one or more sets of prerecorded baseline signals are measured when the stru

APA, Harvard, Vancouver, ISO, and other styles

10

Li, Zongbao. "Crack detection in annular components by ultrasonic guided waves." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15920.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Krishna, Aditya. "Topological Imaging of Tubular Structures using Ultrasonic guided waves." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0111.

Full text

Abstract:

Les structures tubulaires sont largement utilisées dans diverses industries telles que l’aérospatiale, le pétrole et le gaz, le nucléaire, etc. Le Contrôle Non Destructive (CND) de ces structures joue un rôle crucial au cours de leur cycle de vie. Afin de tester de grandes structures avec une accessibilité limitée, la méthode de CND utilisant des ondes guidées a été développée comme une solution viable. En raison de la nature de ces ondes, elles sont capables de se propager sur de grandes distances sans perdre une grande partie de leur énergie. Cependant, elles sont complexes puisque leur vite

APA, Harvard, Vancouver, ISO, and other styles

12

Chan, Chi Kit. "An ultrasonic self-localized automated guided vehicle system /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?IELM%202006%20CHAN.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Seifried, Robert. "Propagation of guided waves in adhesive bonded components." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19494.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Ma, Jian. "On-line measurements of contents inside pipes using guided ultrasonic waves." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/8168.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Willey, Carson Landis. "Ultrasonic Guided Wave Tomography for Wall Thickness Mapping in Pipes." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1460729589.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Autrusson, Thibaut Bernard. "Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries." Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37103.

Full text

Abstract:

Material damage such as dislocations and microcracks are characteristic of early stages of fatigue. Accumulation of these nascent cracks leads to non-linear elastic response of the material. These non-linearities can be detected from harmonic generation for propagating elastic waves. The long term goal of this study is to investigate the non-linear elastic propagation in parts with complex geometry. Cellular Automata is introduced as a new simulation method, in order to develop new analysis on quadratic non-linearities. An existing linear code was progressively modified to take into account

APA, Harvard, Vancouver, ISO, and other styles

17

Koston, E. "Fatigue crack monitoring in multi-layered aircraft structures using guided ultrasonic waves." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/516138/.

Full text

Abstract:

The detection of fatigue cracks at fasteners in the sub layers of multi-layered aircraft structures can be problematic using conventional nondestructive testing methods. In this thesis the sensitivity of low frequency guided ultrasonic waves to detect these defects is studied. Guided ultrasonic waves typically have energy distributed through the thickness of such structures and allow for defect detection in all sub-layers, but have wavelengths larger than commonly used in bulk wave ultrasonic testing. The model aerospace multi-layered structure investigated consists of two aluminium plate stri

APA, Harvard, Vancouver, ISO, and other styles

18

Gandhi, Navneet. "Determination of dispersion curves for acoustoelastic lamb wave propagation." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37158.

Full text

Abstract:

The effect of stress on Lamb wave propagation is relevant to both nondestructive evaluation and structural health monitoring because of changes in received signals due to both the associated strain and the acoustoelastic effect. A homogeneous plate that is initially isotropic becomes anisotropic under biaxial stress, and dispersion of propagating waves becomes directionally dependent. The problem is similar to Lamb wave propagation in an anisotropic plate, except the fourth order tensor in the resulting wave equation does not have the same symmetry as that for the unstressed anisotropic plate,

APA, Harvard, Vancouver, ISO, and other styles

19

Koreck, Juergen. "Computational characterization of adhesive bond properties using guided waves in bonded plates." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-08252006-064856/.

Full text

Abstract:

Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2007.<br>Jacobs, Laurence, Committee Chair ; Qu, Jianmin, Committee Member ; Valle, Christine, Committee Co-Chair.

APA, Harvard, Vancouver, ISO, and other styles

20

Ahmed, Mustofa N. "A Study of Guided Ultrasonic Wave Propagation Characteristics in Thin Aluminum Plate for Damage Detection." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1387732124.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Yucel, Mehmet Kerim. "Signal processing methods for defect detection in multi-wire helical waveguides using ultrasonic guided waves." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11219.

Full text

Abstract:

Non-Destructive Testing of industrial components carries vital importance, both financially and safety-wise. Among all Non-Destructive techniques, Long Range Ultrasonic Testing utilizing the guided wave phenomena is a young technology proven to be commercially valid. Owing to its well-documented analytical models, Ultrasonic Guided Waves has been successfully applied to cylindrical and plate-like structures. Its applications to complex structures such as multi-wire cables are fairly immature, mainly due to the high complexity of wave propagation. Research performed by the author approaches the

APA, Harvard, Vancouver, ISO, and other styles

22

Baltazar-Lopez, Martin Eduardo. "Applications of TAP-NDE technique to non-contact ultrasonic inspection in tubulars." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1614.

Full text

Abstract:

The possibility and feasibility of experimental detection of localized defects in tubes using laser-induced ultrasonic wave approach through Thermo Acousto Photonic Non Destructive Evaluation (TAP-NDE) and Signal processing through wavelet transform is examined in this research. Guided waves in cylindrical surfaces provide solutions for detection of different defects in the material. Several experiments were conducted to this respect. Wave propagation in both axial and circumferential directions was studied. The dispersive wave propagation of ultrasonic waves in hollow cylinders has been inves

APA, Harvard, Vancouver, ISO, and other styles

23

Duroux, Adelaide A. "Estimation of guided waves from cross-correlations of diffuse wavefields for passive structural health monitoring." Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33896.

Full text

Abstract:

Recent theoretical and experimental studies in a wide range of applications (ultrasonics, underwater acoustics, seismicoe) have demonstrated that Green's functions (impulse responses) can be extracted from cross-correlation of diffuse fields using only passive sensors. The technique, whose validity is supported by a physical argument based on time-reversal invariance, effectively uses a correlation process between the point source and points located in the focal zone. Indeed, the coherent noise source distributions can be considered as a timereversal mirror and the cross-correlation operations

APA, Harvard, Vancouver, ISO, and other styles

24

Mograne, Mohamed Abderrahmane. "Viscosimétrie ultrasonore ultra large bande." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS089/document.

Full text

Abstract:

Cette thèse a pour objectif d’instrumenter un contenant familier dans le domaine du biomédical et de la chimie (un tube à essai) avec des éléments piézoélectriques à ondes longitudinales (L) et d’implémenter, en les optimisant, diverses méthodes ultrasonores pour mesurer les viscosités rapidement, sans changer de banc de mesure et cela de quelques Hz à plusieurs dizaines de mégahertz au voisinage de la température ambiante. Grâce au système mis en place il est possible en quelques minutes de déterminer le comportement rhéologique du liquide, étudié en mesurant sa viscosité de cisaillement. Par

APA, Harvard, Vancouver, ISO, and other styles

25

Matt, Howard M. "Structural diagnostics of CFRP composite aircraft components by ultrasonic guided waves and built-in piezoelectric transducers." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3238426.

Full text

Abstract:

Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed January 4, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 203-216).

APA, Harvard, Vancouver, ISO, and other styles

26

Engholm, Marcus. "Ultrasonic Arrays for Sensing and Beamforming of Lamb Waves." Doctoral thesis, Uppsala universitet, Signaler och System, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-122189.

Full text

Abstract:

Non-destructive testing (NDT) techniques are critical to ensure integrity and safety of engineered structures. Structural health monitoring (SHM) is considered as the next step in the field enabling continuous monitoring of structures. The first part of the thesis concerns NDT and SHM using guided waves in plates, or Lamb waves, to perform imaging of plate structures. The imaging is performed using a fixed active array setup covering a larger area of a plate. Current methods are based on conventional beamforming techniques that do not efficiently exploit the available data from the small array

APA, Harvard, Vancouver, ISO, and other styles

27

Leleux, Alban. "Contrôle non destructif de composites par ondes ultrasonores guidées, générées et détectées par multiéléments." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14623/document.

Full text

Abstract:

Une technique de Contrôle Non Destructif (CND) a été développée, permettant la génération et la détection d’ondes de Lamb guidées le long de grandes plaques constituées de différents matériaux (métal, polymère ou composite renforcé par des fibres). Basée sur l’emploi de nombreux éléments étroitement couplés à la plaque, cette technique d’inspection diffère du Structural Health Monitoring (SHM) classique car tous les éléments émetteurs ou récepteurs sont regroupés dans une zone très localisée, définie par la surface active d’une sonde multiélément matricielle, et ne sont pas fixés de manière pe

APA, Harvard, Vancouver, ISO, and other styles

28

Coccia, Stefano. "Ultrasonic guided waves for structural health monitoring and application to rail inspection prototype for the Federal Railroad Administration." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3283950.

Full text

Abstract:

Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed March 14, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 271-281).

APA, Harvard, Vancouver, ISO, and other styles

29

Poosh, Matineh Eyb. "A Data-Driven Framework Based on Sparse Representation of Ultrasonic Guided-Waves for Online Damage Detection of Pipelines." Research Showcase @ CMU, 2015. http://repository.cmu.edu/dissertations/642.

Full text

Abstract:

This work addresses some of the open challenges in guided-wave based structural health monitoring (SHM) of pipelines. In this dissertation, we review these challenges under three headings: (a) Multiple modes, (b) Multi-path reflections, and (c) Sensitivity to environmental and operational conditions (EOCs). The objective is to develop damage detection methods that (1) simplify guided-wave signals, and (2) have low sensitivity to EOC variations. First, I propose a supervised method for online damage detection. The detection performance is maximized under variety of EOCs, by imposing a sparsity

APA, Harvard, Vancouver, ISO, and other styles

30

Gravenkamp, Hauke [Verfasser], Sabine [Gutachter] Langer, Marc [Gutachter] Kreutzbruck, and Chongmin [Gutachter] Song. "Numerical methods for the simulation of ultrasonic guided waves / Hauke Gravenkamp ; Gutachter: Sabine Langer, Marc Kreutzbruck, Chongmin Song." Berlin : Bundesanstalt für Materialforschung und -prüfung (BAM), 2014. http://d-nb.info/1122647859/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Rodrigues, Marques Hugo. "Omnidirectional and unidirectional SH0 mode transducer arrays for guided wave evaluation of plate-like structures." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/14021.

Full text

Abstract:

Structures made of plate-like components are common in a variety of industries where the impacts of structural failures are severe. In many cases these structures are surrounded and only partially accessible, such as storage tanks and bridges, making them difficult to inspect frequently. The application of ultrasonic Guided Waves (GWs) in the evaluation and monitoring of relatively large plate-like structures is evermore a feasible option with the continuous development of transducer arrays. The use of transducer arrays is however complex due to directional control and the existence of many GW

APA, Harvard, Vancouver, ISO, and other styles

32

Chitikireddy, Ravi. "Laser generated thermoelastic waves in finite and infinite transversely isotropic cylinders." Taylor & Francis Group, LLC, 2010. http://hdl.handle.net/1993/8445.

Full text

Abstract:

This thesis presents a theoretical study of thermoelastic guided waves in cylinders in the context of Lord-Shulman generalized theory of thermoelasticity. Two different methods were formulated to study dispersion relations in infinite cylinders. One of them is a Semi Analytical Finite Element (SAFE) method and the other is an analytical method. In the SAFE method, the dispersion equation has been formulated as a generalized eigenvalue problem by treating radial displacement and temperature with a one dimensional finite element model through the thickness of the cylinder. In the analytical meth

APA, Harvard, Vancouver, ISO, and other styles

33

Murdy, Paul. "Combining Acoustic Emission and Guided Ultrasonic Waves for Global Property Prediction and Structural Health Monitoring of Glass Fiber Composites." Thesis, Montana State University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10981460.

Full text

Abstract:

<p> Since the turn of the century, wind turbines have been rapidly growing in size and are projected to continue growing as the technology develops. These increases in size have led to increased failure rates of the glass fiber composite turbine blades. Because of this, it is of utmost importance to understand failure mechanisms in glass fiber composites and investigate new approaches to predicting failures. This has led to advancements in structural health monitoring of large composites structures by applying sophisticated sensing technologies, in attempts to evaluate material damage states a

APA, Harvard, Vancouver, ISO, and other styles

34

Huber, Armin [Verfasser], and Markus [Akademischer Betreuer] Sause. "Numerical Modeling of Guided Waves in Anisotropic Composites with Application to Air-coupled Ultrasonic Inspection / Armin Huber ; Betreuer: Markus Sause." Augsburg : Universität Augsburg, 2021. http://d-nb.info/1230755314/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

McKeon, Peter. "A fundamental study to enable ultrasonic structural health monitoring of a thick-walled composite over-wrapped pressure vessel." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54308.

Full text

Abstract:

A structural health monitoring system is desired to monitor the integrity of cylindrical, multi-layer carbon over-wrapped pressure vessels intended to house hydrogen at high pressures. In order to develop the system based on ultrasonic guided wave technology, the interaction between ultrasonic guided waves and defect types of interest must be understood. Finite element models in two and three dimensions are developed to predict guided wave motion in the reservoirs. Key parameters are optimized including frequency range, excited modes, detected modes, and transducer dimensions. A novel base

APA, Harvard, Vancouver, ISO, and other styles

36

Okumura, Shigeaki. "Array Signal Processing for Accurate Medical Ultrasound Measurements." Kyoto University, 2018. http://hdl.handle.net/2433/232419.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Lefevre, Fabien. "Caractérisation de structures du type plaque par ondes guidées générées et détectées par laser." Valenciennes, 2010. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/24980ba6-f06c-4c75-988a-16e1228d2e42.

Full text

Abstract:

La réalisation de couches minces déposées sur substrats est très recherchée dans de nombreuses applications. C'est le cas par exemple des pièces nickelées destinées à des dispositifs à hautes performances techniques, où une couche anti-corrosion est déposée a n d'améliorer leur imperméabilité. L'utilisation de ces structures du type couche sur substrat étant grandissante, on comprend dès lors l'importance de disposer de moyens non destructifs permettant de les contrôler et de les caractériser. Dans ce travail, l'objectif a été de mettre à pro t les ondes acoustiques guidées pour le contrôle et

APA, Harvard, Vancouver, ISO, and other styles

38

Hall, James Stroman. "Adaptive dispersion compensation and ultrasonic imaging for structural health monitoring." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41159.

Full text

Abstract:

Ultrasonic guided wave imaging methods offer a cost-effective mechanism to perform in situ structural health monitoring (SHM) of large plate-like structures, such as commercial aircraft skins, ship hulls, storage tanks, and civil structures. However, current limits in imaging quality, environmental sensitivities, and implementation costs, among other things, are preventing widespread commercial adoption. The research presented here significantly advances state of the art guided wave imaging techniques using inexpensive, spatially distributed arrays of piezoelectric transducers. Novel adaptiv

APA, Harvard, Vancouver, ISO, and other styles

39

Höhne, Christian [Verfasser], Jens [Akademischer Betreuer] Prager, Ennes [Gutachter] Sarradj, and Manfred [Gutachter] Kaltenbacher. "Multimodal approach for the numerical simulation of ultrasonic guided waves in cylindrical structures of non-constant thickness / Christian Höhne ; Gutachter: Ennes Sarradj, Manfred Kaltenbacher ; Betreuer: Jens Prager." Cottbus : BTU Cottbus - Senftenberg, 2017. http://d-nb.info/1127580825/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

El, Rammouz Hala. "Réalisation de matrices de micro-transducteurs acoustiques : application au controle santé intégré." Thesis, Valenciennes, Université Polytechnique Hauts-de-France, 2021. http://www.theses.fr/2021UPHF0010.

Full text

Abstract:

Les réseaux de micro-transducteurs connaissent un fort développement afin de répondre aux exigences du contrôle santé intégré des structures. Ce dernier permet d'évaluer en tout moment l'état de santé de la structure tout en intégrant un système de contrôle non destructif à celle-ci. En effet, un réseau de micro-transducteurs permet d'acquérir plusieurs signaux en même temps sans effectuer un balayage spatial permettant de caractériser la structure. Parallèlement, l'utilisation des ondes guidées ultrasonores fournit un outil efficace pour la caractérisation de celle-ci. Cependant, elles présen

APA, Harvard, Vancouver, ISO, and other styles

41

Masmoudi, Mohamed. "Modélisation de la propagation d'ondes guidées, générées et détectées par transducteurs ultrasonores à couplage air : Application au CND de structures aéronautiques composites." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14483/document.

Full text

Abstract:

Le contrôle non destructif par ondes guidées générées et détectées par des transducteurs ultrasonores à couplage par air, présente deux avantages majeurs. Le premier réside dans la capacité des ondes guidées à transporter l’information sur la qualité du milieu sur une grande distance. De plus, l’absence d’un milieu de couplage liquide entre les capteurs et le milieu à tester, rend le contrôle plus commode. Ce travail consiste d’abord à développer un procédé de simulation numérique qui prend en considération de nombreux paramètres du système de contrôle. Dans une optique de réduire le nombre de

APA, Harvard, Vancouver, ISO, and other styles

42

Bouchakour, Omar. "Contrôle-santé structurel passif à ondes guidées, basé sur des réseaux de capteurs ultrasonores désynchronisés." Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2025. http://www.theses.fr/2025UPHF0004.

Full text

Abstract:

L'évolution de la surveillance de l'état des structures (SHM) au cours des dernières années a vu émerger des réseaux de capteurs indépendants à faibles ressources matérielles. Cependant, les signaux enregistrés par ces capteurs pour faire de l'imagerie passive peuvent présenter des désynchronisations qui rendent difficile la localisation des endommagements dans la structure inspectée. Bien que la technique de pic de corrélation (PCT), reposant sur la symétrie des fonctions de corrélation de bruit, puisse être appliquée pour corriger ces décalages, une synchronisation parfaite est difficile à a

APA, Harvard, Vancouver, ISO, and other styles

43

Luker, L. Dwight. "Investigation of a cylindrical nonacoustic-wavenumber calibration array." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15885.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Sasso, Magali. "Traitement et analyse du signal ultrasonore pour la caractérisation de l'os cortical." Phd thesis, Paris Est, 2008. http://www.theses.fr/2008PEST0009.

Full text

Abstract:

Ce travail de thèse porte sur l’analyse et le traitement des signaux ultrasonores pour la caractérisation de l’os cortical. La première partie est dédiée à l’analyse des signaux acquis par un prototype de sonde de transmission axiale à 1 MHz. Nous montrons qu’une contribution arrivant après le premier signal présente un intérêt pour la caractérisation ultrasonore de l’os cortical. En effet, cette contribution évaluée sur des radius humains in vitro est associée à une onde de flexion propagée dans l’os qui est dépendante de l’épaisseur corticale. L’analyse de cette contribution a nécessité le d

APA, Harvard, Vancouver, ISO, and other styles

45

Vogt, Thomas Karl. "Determination of material properties using guided waves." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273280.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Ouabi, Othmane-Latif. "Towards ultrasound-based localization and mapping for long-range inspection robots." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0145.

Full text

Abstract:

L’inspection de larges structures en plaques métalliques, telles que les réservoirs de stockage ou les coques de navires, est un problème majeur dans l’industrie qui nécessite des solutions fiables et efficaces. Au cours du temps, des défauts non visibles, tels que des couches de corrosion apparaissant sur la partie intérieure des coques de navires, peuvent se développer et affecter l’intégrité de la structure. Pour empêcher des catastrophes, ces structures doivent être inspectées de façon à pouvoir planifier des opérations de maintenance lorsque des défauts sont détectés. Les méthodes d’inspe

APA, Harvard, Vancouver, ISO, and other styles

47

Pezant, Joannes Charles. "High temperature thickness monitoring using ultrasonic waves." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26577.

Full text

Abstract:

Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Michaels, Jennifer; Committee Member: Jacobs, Laurence; Committee Member: Michaels, Thomas. Part of the SMARTech Electronic Thesis and Dissertation Collection.

APA, Harvard, Vancouver, ISO, and other styles

48

Mora, Pierric. "Réponse élastodynamique d'une plaque stratifiée anisotrope : approches comparées. : Vers le développement de méthodes hybrides." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0382/document.

Full text

Abstract:

Cette thèse traite de la résolution du problème direct de propagation d'un champ élastodynamique rayonné par une source dans un milieu stratifié anisotrope. Le contexte applicatif visé est le contrôle non destructif par ondes ultrasonores guidées de plaques de matériaux composites. Aux basses fréquences, ces matériaux sont assimilables à des milieux homogènes, anisotropes et dissipatifs. Deux approches causales sont étudiées et mises en oeuvre pour résoudre l'équation d'onde, et leur intérêt vis-à-vis de la méthode modale harmonique - la plus couramment employée dans ce domaine applicatif - es

APA, Harvard, Vancouver, ISO, and other styles

49

Bingham, Jill Paisley. "Ultrasonic guided wave interpretation for structural health inspections." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539623538.

Full text

Abstract:

Structural Health Management (SHM) combines the use of onboard sensors with artificial intelligence algorithms to automatically identify and monitor structural health issues. A fully integrated approach to SHM systems demands an understanding of the sensor output relative to the structure, along with sophisticated prognostic systems that automatically draw conclusions about structural integrity issues. Ultrasonic guided wave methods allow us to examine the interaction of multimode signals within key structural components. Since they propagate relatively long distances within plate- and shell-l

APA, Harvard, Vancouver, ISO, and other styles

50

Spratt, William. "Design and Testing of an Ultrasonic Torsional Wave Sensing Platform." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/SprattW2009.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!