Thematische Bibliographien / Guided elastic waves

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Auswahl der wissenschaftlichen Literatur zum Thema „Guided elastic waves“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Guided elastic waves"

Fairuschin, Viktor, Felix Brand, Alexander Backer und Klaus Stefan Drese. „Elastic Properties Measurement Using Guided Acoustic Waves“. Sensors 21, Nr. 19 (08.10.2021): 6675. http://dx.doi.org/10.3390/s21196675.

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Nondestructive evaluation of elastic properties plays a critical role in condition monitoring of thin structures such as sheets, plates or tubes. Recent research has shown that elastic properties of such structures can be determined with remarkable accuracy by utilizing the dispersive nature of guided acoustic waves propagating in them. However, existing techniques largely require complicated and expensive equipment or involve accurate measurement of an additional quantity, rendering them impractical for industrial use. In this work, we present a new approach that requires only a pair of piezoelectric transducers used to measure the group velocities ratio of fundamental guided wave modes. A numerical model based on the spectral collocation method is used to fit the measured data by solving a bound-constrained nonlinear least squares optimization problem. We verify our approach on both simulated and experimental data and achieve accuracies similar to those reported by other authors. The high accuracy and simple measurement setup of our approach makes it eminently suitable for use in industrial environments.

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Camou, S., Th Pastureaud, H. P. D. Schenk, S. Ballandras und V. Laude. „Guided elastic waves in GaN-on-sapphire“. Electronics Letters 37, Nr. 16 (2001): 1053. http://dx.doi.org/10.1049/el:20010668.

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Dieulesaint, Eugène, und Daniel Royer. „Liquid level detector by guided elastic waves“. Journal of the Acoustical Society of America 85, Nr. 3 (März 1989): 1390. http://dx.doi.org/10.1121/1.397395.

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Sotiropoulos, D. A., und G. Tougelidis. „Guided elastic waves in orthotropic surface layers“. Ultrasonics 36, Nr. 1-5 (Februar 1998): 371–74. http://dx.doi.org/10.1016/s0041-624x(97)00092-9.

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Skelton, Elizabeth A., Samuel D. M. Adams und Richard V. Craster. „Guided elastic waves and perfectly matched layers“. Wave Motion 44, Nr. 7-8 (August 2007): 573–92. http://dx.doi.org/10.1016/j.wavemoti.2007.03.001.

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Gei, Massimiliano. „Elastic waves guided by a material interface“. European Journal of Mechanics - A/Solids 27, Nr. 3 (Mai 2008): 328–45. http://dx.doi.org/10.1016/j.euromechsol.2007.10.002.

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Zhou, Fang Jun, Yue Min Wang, Chuan Jun Shen, Feng Rui Sun und Hong Tao Zhang. „Application of Ultrasonic Guided Waves Testing Method in Coiled Springs“. Applied Mechanics and Materials 127 (Oktober 2011): 449–54. http://dx.doi.org/10.4028/www.scientific.net/amm.127.449.

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In this paper,application of defect detection by ultrasonic guided waves in springs has been studied in three aspects,which are theoretical calculation, simulation modeling and experiments.For the springs structure is helix and it can not be directly described easily,less work has been done on theoretical calculation of elastic wave propagation in the springs.The elastic wave equation of the spiral structure is established and calculated numerically here,considering the theoretical calculation helps to quantitative analyze the law of elastic wave propagation in the springs.Then guided waves dispersion relations corresponding is achieved.The experimental results of spring field testing agree well with the theoretical calculations and simulations,indicating the effectiveness of ultrasonic guided waves inspection in springs.

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Fan, Zheng, und Mike J. S. Lowe. „Elastic waves guided by a welded joint in a plate“. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, Nr. 2107 (15.04.2009): 2053–68. http://dx.doi.org/10.1098/rspa.2009.0010.

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The inspection of large areas of complex structures is a growing interest for industry. An experimental observation on a large welded plate found that the weld can concentrate and guide the energy of a guided wave travelling along the direction of the weld. This is attractive for non-destructive evaluation (NDE) since it offers the potential to quickly inspect for defects such as cracking or corrosion along long lengths of welds. In this paper, a two-dimensional semi-analytical finite-element (SAFE) method is applied to provide a modal study of the elastic waves that are guided by the welded joint in a plate. This brings understanding to the compression wave that was previously observed in the experiment. However, during the study, a shear weld-guided mode, which is non-leaky and almost non-dispersive, has also been discovered. Its characteristics are particularly attractive for NDE, so this is a significant new finding. The properties for both the compression and the shear mode are discussed and compared, and the physical reason for the energy trapping phenomena is then explained. Experiments have been undertaken to validate the existence of the shear weld-guided mode and the accuracy of the FE model, showing very good results.

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Frehner, Marcel, und Stefan M. Schmalholz. „Finite-element simulations of Stoneley guided-wave reflection and scattering at the tips of fluid-filled fractures“. GEOPHYSICS 75, Nr. 2 (März 2010): T23—T36. http://dx.doi.org/10.1190/1.3340361.

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The reflection and scattering of Stoneley guided waves at the tip of a crack filled with a viscous fluid was studied numerically in two dimensions using the finite-element method. The rock surrounding the crack is fully elastic and the fluid filling the crack is elastic in its bulk deformation behavior and viscous in its shear deformation behavior. The crack geometry, especially the crack tip, is resolved in detail by the unstructured finite-element mesh. At the tip of the crack, the Stoneley guided wave is reflected. The amplitude ratio between reflected and incident Stoneley guided wave is calculated from numerical simulations, which provide values ranging between 43% and close to 100% depending on the type of fluid filling the crack (water, oil or hydrocarbon gas), the crack geometry (elliptical or rectangular), and the presence of asmall gas cap at the cracktip. The interference of incident and reflected Stoneley guided waves leads to a node (zero amplitude) at the tip of the crack. At other positions along the crack, this interference increases the amplitude. However, the exponential decay away from the crack makes the Stoneley guided wave difficult to detect at a relatively short distance away from the crack. The part of the Stoneley guided wave that is not reflected is scattered at the crack tip and emitted into the surrounding elastic rock as body waves. For fully saturated cracks, the radiation pattern of these elastic body waves points in every direction from the crack tip. The emitted elastic body waves can allow the detection of Stoneley guided wave-related resonant signals at distances away from the crack where the amplitude of the Stoneley guided wave itself is too small to be detected.

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Lobkis, O. I., und D. E. Chimenti. „Elastic guided waves in plates with rough surfaces“. Applied Physics Letters 69, Nr. 23 (02.12.1996): 3486–88. http://dx.doi.org/10.1063/1.117260.

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Dissertationen zum Thema "Guided elastic waves"

Yi, Kaijun. „Controlling guided elastic waves using adaptive gradient-index structures“. Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC044/document.

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Les matériaux à gradient d'indice de réfraction (GRIN) présentent des propriétés mécaniques variant en temps ou/et en espace. Ils ont été testés pour des applications prometteuses dans de nombreuses applications d'ingénierie, comme pour le contrôle santé structurale ou la surveillance de structure (SHM), le contrôle des vibrations et bruit, la récupération d'énergie, etc. D'un autre côté, les matériaux piézoélectriques offrent la possibilité de réaliser des cellules composites dont les propriétés mécaniques peuvent être contrôlées en ligne. Motivé par ces deux approches, cette thèse étudie la mise en œuvre de structures GRIN adaptatifs pour le contrôle des ondes élastiques. Deux types de structures GRIN adaptatifs sont étudiés dans ce travail. Le premier exemple concerne la mise en œuvre d'une lentille piézoélectrique dans une plaque. Il est composé de patchs piézoélectriques shuntés, collés périodiquement en surface du guide d'ondes. Les circuits de shunt utilisés permettent d'émuler une capacité négative (NC). En accordant les valeurs de NC on peut ajuster l'indices de réfraction du milieu à l'intérieur de la lentille piézoélectrique et pour satisfaire une fonction sécante hyperbolique. Les résultats numériques montrent que les lentilles piézoélectriques peuvent alors focaliser les ondes de flexion de la plaque sur les points focaux. La lentille piézoélectrique est efficace dans une grande bande de fréquences et efficace dans une grande plage de fonctionnement. Ainsi elle peut focaliser des ondes sur différent points par simple ajustement des valeurs de NC réalisés par le circuit. Cette focalisation adaptative la rend très intéressante pour de nombreuses applications comme la récupération d'énergie ou le SHM. La mise en œuvre de ces techniques pour la récupération d'énergie est discutée dans cette thèse. Le second exemple concerne l'étude d'une structure dont les propriétés mécaniques sont contrôlées en temps et en espace. En particulier, une modulation périodique permet de créer une onde artificielle se propageant dans la structure. L'interaction avec des ondes mécaniques entraîne une rupture de réciprocité visible dans un diagramme de bande non symétrique. De nombreux phénomènes inhabituels sont observés dans ce type de structures variables : fractionnement des fréquences, conversion d'ondes et transmission unidirectionnelles. Deux types de conversion fréquentielle sont démontrés et expliqués. Le premier est induit par la transmission d'énergie entre les différents modes Bloch et le second type est dû à la diffusion de Bragg dans les structures modulées. La transmission unidirectionnelle des ondes pourrait être exploitée pour réaliser des diodes dans des systèmes infinis ou semi-infinis. Cependant, la transmission unidirectionnelle n'existe pas dans les systèmes finis en raison des phénomènes de conversion de fréquence
GRadient INdex (GRIN) media are those whose properties smoothly vary in space or/and time. They have shown promising effects in many engineering applications, such as Structural Health Monitoring (SHM), vibration and noise control, energy harvesting, etc. On the other hand, piezoelectric materials provide the possibility to build unit cells, whose mechanical properties can be controlled on-line. Motivated by these two facts, adaptive GRIN structures, which can be realized using shunted piezoelectric materials, are explored in this dissertation to control guided elastic waves. Two types of adaptive GRIN structures are studied in this work. The first type is a piezo-lens. It is composed of shunted piezoelectric patches bonded on the surfaces of plates. To control the mechanical properties of the piezoelectric composite, the piezoelectric patches are shunted with Negative Capacitance (NC). By tuning the shunting NC values, refractive indexes inside the piezo-lens are designed to satisfy a hyperbolic secant function in space. Numerical results show that the piezo-lens can focus waves by smoothly bending them toward the designated focal point. The piezo-lens is effective in a large frequency band and is efficient in many different working conditions. Also the same piezo-lens can focus waves at different locations by tuning the shunting NC values. The focusing effect and tunable feature of piezo-lens make it useful in many applications like energy harvesting and SHM. The former application is fully discussed in this thesis. The focusing effect at the focal point results in a known point with high energy density, therefore harvesting at the focal point can yield more energy. Besides, the tunable ability makes the harvesting system adaptive to environment changes. The second type is the time-space modulated structure. Its properties are modulated periodically both in time and space. Particularly, the modulation works like a traveling wave in the structure. Due to the time-varying feature, time-space modulated structures break the reciprocity theorem, i.e., the wave propagation in them is nonreciprocal. Many unusual phenomena are observed during the interaction between waves and time-space modulated structures: frequency splitting, frequency conversion and one-way wave transmission. Two types of frequency conversion are demonstrated and explained. The first type is caused by energy transmission between different orders Bloch modes. The second type is due to the Bragg scattering effect inside the modulated structures. The one-way wave transmission could be exploited to realize one-way energy insulation in equivalent infinite or semi-inffnite systems. However, the one-way energy insulation fails in finite systems due to the frequency conversion phenomenon

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Fong, Ka Lok Jimmy. „A study of curvature effects on guided elastic waves“. Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421857.

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Cortes, Correales Daniel H. „Elastic guided wave dispersion in layered piezoelectric plates application to ultrasound transducers and acoustic sensors /“. Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10206.

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Thesis (Ph. D.)--West Virginia University, 2009.
Title from document title page. Document formatted into pages; contains vi, 84 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 79-84).

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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.

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Sharma, Sanjay. „Performance Demonstration of Guided Waves based Structural Health Monitoring system for Aerospace Application“. Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG073.

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Les ondes élastiques guidées émises et reçues par des transducteurs piézoélectriques minces sont reconnues comme une technologie prometteuse pour plusieurs applications de surveillance de l'état de santé des structures (ou Structural Health Monitoring - SHM), en particulier pour les composants aérospatiaux. La démonstration des performances de ces systèmes, souvent exprimées en termes de courbe de probabilité de détection (POD), est un élément clé du déploiement réussi de cette technologie dans l'industrie. La détermination expérimentale de la courbe POD nécessite de nombreux échantillons instrumentés, ce qui rend son coût prohibitif. Une approche basée sur la simulation, ou assistée par un modèle, est une alternative intéressante. Cependant, la simulation de systèmes SHM basés sur les ondes guidées et la détermination de la courbe POD de tels systèmes sont jusqu'à présent limitées en raison d'un manque de méthodologie spécifique, de procédures, de méthodes statistiques appropriées et de validation. Cette thèse propose une méthodologie générale pour une approche POD assistée par la simulation de système SHM par ondes guidées, avec une démonstration sur la surveillance d'une fissure croissante à partir d'un trou dans une plaque d'aluminium. La méthodologie tire parti de l'outil de simulation par éléments finis spectraux transitoires dans le domaine temporel développé au CEA-List (module CIVA SHM) qui permet d'exécuter les grandes campagnes de simulation nécessaires pour déterminer une courbe POD. Un nouveau modèle d'actionneur hybride a été proposé dans ce travail en considérant le comportement dépendant de la fréquence du transducteur et la contrainte normale en plus de la contrainte radiale comme charges surfaciques afin de permettre l’utilisation de la simulation sur une plus grande gamme de fréquences d'excitation, adaptées à l'application visée. Deux méthodes récentes et appropriées d’un point de vue statistique : la « longueur à la détection » et « random effects », ont ensuite été adaptées pour estimer et comparer la courbe POD à partir des ensembles de données expérimentales et simulées. L'approche bayésienne s'est avérée plus utile que l'estimation du maximum de vraisemblance pour l'estimation des paramètres du modèle de la méthode random effects afin de comparer la limite d'incertitude pour chaque paramètre du modèle à partir des ensembles de données expérimentales et simulées. Enfin, une étude de détermination de la taille de l'échantillon a été menée sur la base de la méthode random effects afin d'identifier le nombre d'échantillons nécessaires pour répondre aux exigences d'une application SHM particulière. Tous ces résultats montrent une grande confiance dans l'approche assistée par la simulation pour l’estimation de la POD et confirment le potentiel de cette solution en tant qu'outil compatible avec les exigences industrielles pour la démonstration des performances des systèmes SHM basés sur les ondes guidées
Guided elastic waves emitted and received by thin piezoelectric transducers are recognized as a promising technology for several applications of Structural Health Monitoring, especially of aerospace components. Demonstration of the performances of such systems, often expressed in terms of Probability Of Detection (POD) curve, is a key enabler of the successful deployment of the technology in industry. POD curve experimental determination requires many instrumented samples making its cost prohibitive. A simulation-based approach, or model-assisted, is an attractive alternative. However, simulation in guided waves-based SHM and POD determination of such systems are so far limited due to a lack of specific methodology, procedures, appropriate statistical methods, and validation. This thesis proposes a general methodology for a model-assisted POD approach of guided waves based SHM, with a demonstration on monitoring of a growing crack from a hole in an aluminum plate. The methodology benefits from the efficient time domain transient spectral finite element simulation tool developed at CEA-List (CIVA SHM module) that allows to run the large simulation campaigns required to determine a POD curve. A new hybrid actuator model has been proposed in this work by considering the transducer frequency dependent behaviour and normal stress in addition to radial stress as a surface loads to enable the use of simulation on a higher range of excitation frequencies, suitable for the targeted application. Two recent suitable statistical methods: length-at-detection and random effects, have then been adapted to estimate and to compare the POD curve from both experimental and simulated datasets. The Bayesian approach is found to be more useful in model parameter estimation of random effects method for comparing the uncertainty bound for each model parameter from experimental and simulated datasets than Maximum Likelihood Estimation. Finally, a sample size determination study has been conducted based on the random effects method to identify how many samples are required to achieve the requirement of a particular SHM application. All these results show great confidence in the model-assisted approach to POD estimation methodology and confirm the potential of this solution as a cost-effective tool for performance demonstration of guided waves-based SHM systems

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Vanotti, Meddy. „Développement d'un système de détection en milieux gazeux d'espèces à risque pour le contrôle environnemental (application au monoxyde de carbone et à l'hydrogène) : Composants et systèmes micro-acoustiques“. Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2022/document.

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La détection de gaz potentiellement dangereux représente une problématique d’actualité pour la protectiondes personnes mais aussi un enjeu d’avenir pour le stockage des énergies renouvelables. Les outils desimulations développés au sein du Département Temps-Fréquence de l’Institut FEMTO-ST, associés aux outilstechnologiques proposés par la centrale MIMENTO ont permis la mise au point de capteurs SAW apportantdes réponses à ces problématiques. Ces derniers fondés sur les propriétés des ondes de Love ont ainsi permis ladétection du monoxyde de carbone dans la gamme du ppm. De même, la mesure de concentration d’hydrogènede l’ordre du pourcent a pu être réalisée par le biais de dispositifs s’appuyant sur les ondes Rayleigh. Les effortsfournis pour l’optimisation des dispositifs électro-acoustiques ont aboutis à la réalisation de lignes à retard surquartz affchant des pertes d’insertion de 16 dB. La limitation de ces pertes, généralement de l’ordre de 25 dB à30 dB sur quartz, augmente les potentialités de nos capteurs en terme d’autonomie et de fonctionnalisation desurface. La connaissance des phénomènes physiques gouvernant leur fonctionnement représente, à notre sens,la base de leur développement futur. De cette idée découle notre démarche d’identification et de compréhensionde ces derniers par le biais des différentes techniques de caractérisations et d’analyses disponible au sein denotre l’institut. Des pistes, telles que le recours à un alliage métallique pour la fonctionnalisation des surfacessensibles et la mise en œuvre d’une méthode de séparation des puces limitant les perturbations du signal directdes dispositifs électro-acoustiques, ont été explorées et ont permis d’améliorer la réponse des capteurs. Lepotentiel des composants à ondes élastiques guidée pour la détection de grandeurs chimiques en phase gazeusea pu être établi sur la base des résultats expérimentaux obtenus au cours de cette thèse. Dans la continuité decette dernière, deux projets de recherche (P-AIR et SMARTY) visant le contrôle de la qualité de l’air en milieuurbain ont d’ors et déjà été engagés
The detection of hazardous gas is a topical issue for the protection of persons. Besides, it represents a challenge linked to the storage of renewable energy. Simulation tools developed within the Time and Frequency Department attached to the FEMTO-ST Institute together with technological facilities available at MIMENTO center have enabled the development of SAW sensors providing answers to these issues. These Love wave’sbased sensors properties have enabled the detection of carbon monoxide in the ppm range. Similarly, hydrogen concentrations of the percent order has been measured by mean of Rayleigh wave’s based sensors. The efforts to optimize electro-acoustic devices have led to achieve delay lines built on quartz with insertion losses of 16 dB.Usually around 25 dB to 30 dB, the reduction of the insertion losses improves the potential of these sensorsin terms of autonomy and surface functionalization. Knowledge of the physical phenomena governing theoperation of these sensors represent the basis of their future development. Thus, different characterization and analysis techniques available in our institute have been carried out to reveal these phenomena. From there, the functionalization of sensor’s sensitives surfaces with metallic alloys and implementation of a chip separation method limiting the disturbance of the direct signal of the electro-acoustic devices, have been explored to improve the performance of the sensors. Based on the experimental results obtained in this thesis, the potential of elastic guided wave’s sensors applied to the detection of chemical quantities in gas phase can be established.In continuation of this study, two projects (P-AIR and SMARTY) dedicated to the control of the urban air quality have already been engaged

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Karpfinger, Florian. „Modelling borehole wave signatures in elastic and poroelastic media with spectral method“. Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/2447.

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Borehole sonic measurements are an important tool to characterize formation and completion properties of hydrocarbon or water reservoirs. Such measurements can provide direct information about rock physical parameters such as permeability or elastic moduli. These properties are obtained from guided waves propagating along boreholes. The so called tube wave or Stoneley wave is a symmetric mode which compresses the fluid column leading to a piston like motion. If the medium around the borehole wall is permeable, the radial expansion of the fluid column will result in fluid flow across the borehole wall. This results in a sensitivity of the tube wave signature to the permeability of the surrounding formation which manifests itself in a characteristic dispersion and attenuation of the tube wave. Information about the permeability of the surrounding formation provides essential knowledge for reservoir characterization.In addition to the traditional method of using tube wave signatures for formation permeability estimations, the same approach may be used for production monitoring. In sand reservoirs a complicated borehole completion is installed during the production phase for the purpose of controlling sand production. In such a setup highly permeable layers such as a sand screen or a gravel pack are used to prevent sand production.The problem with such completions is that they are very expensive to install and susceptible to plugging or corrosion. No permanent surveillance tool exists to date which allows diagnosis of problems in sand-screened deepwater completions. However, the recently proposed Real-Time Completion Monitoring (RTCM) uses the signature of tube waves to identify permeability changes: the increase of the tube wave velocity can indicate a decrease of permeability and vice versa. Therefore, RTCM has potential to identify problems in sand-screened deepwater completions.In order to understand the acoustic response of such deepwater completions, the dispersion and attenuation of tube waves in this complicated setup needs to be studied. To this end I have developed a modelling algorithm based on a spectral method. The developed algorithm computes the dispersion and attenuation of borehole modes propagating in a cylindrically layered structure with an arbitrary number of fluid, elastic and poroelastic layers. The numerical algorithm discretizes the medium along the radial axis using Chebyshev interpolation points derived from Chebyshev polynomials. The differential operators are discretized using spectral differentiation matrices. Thus, for any number of layers, the corresponding equations can be expressed as a generalized algebraic eigenvalue problem. For a given frequency, the eigenvalues correspond to the wavenumbers of different modes. The eigenvectors, computed along with the eigenvalues, correspond to the displacement potentials. They can be used to obtain the variation of displacement and stress components along the radius of the structure.In this thesis the spectral method was first developed for structures with an arbitrary number of fluid and elastic layers. Subsequently, the algorithm was extended for poroelasticity. The results produced by the modelling program are benchmarked against analytical solutions. Such analytical solutions are known for elastic and poroelastic cylinders as well as fluid filled tubes. The tube wave dispersion in a fluid-filled borehole surrounded by an elastic or poroelastic formation obtained with the spectral method was compared to the analytical low-frequency solution.I obtained the dispersion of the two tube waves propagating in a four layer completion model: fluid – permeable sand-screen – fluid – elastic casing. Varying the permeability of the sand-screen layer allowed me to account for the effect of fluid flow across this layer. Being able to obtain the acoustic response can help to identify broken fluid communication which increases the tube wave velocity. A corroded sand-screen has an extremely attenuated tube wave signature.Furthermore, I have implemented the more complex model of a borehole surrounded by an altered zone in the algorithm. Due to drilling damage the altered zone is an area of reduced permeability. In order to account for the effect of the altered zone on the tube wave signature, up to ten layers were used with stepwise increase of permeability from the borehole towards the formation. Overall, the spectral method proved to be a valuable algorithm to model wave propagation in cylindrical structures.Using borehole modes to evaluate the physical properties of the formation or completions is an important application. However, in borehole seismic modelling, such as crosshole or VSP, it is also important to account for the effect of boreholes and the associated modes. Since the borehole radius is a thousand times smaller then the investigated volume it would require a prohibitively small grid size to explicitly model the borehole. However, it is possible to effectively represent a borehole as a superposition of point sources. This mimics the presence of borehole modes. In order to implement this technique for poroelasticity, it is necessary to model source signatures in poroelastic media. To this end I have analyzed the radiation characteristics and moment tensor solutions for various source types. Together with the spectral method these point source representations can be used to model the effect of boreholes. This will pave the way for more efficient poroelastic seismic modelling in various fluid-filled boreholes and completions.

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De, Lima Washington Jose. „Harmonic generation in isotropic elastic waveguides /“. Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004249.

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Kulakovskyi, Andrii. „Développement d’un système SHM pour aéronef par ondes élastiques guidées“. Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX021/document.

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Un système SHM par ondes guidées a pour but d'évaluer l'intégrité d'une grande variété de structures fines, telles que les fuselages d'avions, les tuyaux, les réservoirs, etc. Un tel système est basé sur un réseau de capteurs piézoélectriques pour l'excitation et la mesure des ondes guidées. Cette méthode de SHM par ondes guidées est prometteuse pour l'inspection de structures de grande taille, ces ondes se propageant sur de grandes distances avec peu d'atténuation, tout en étant sensibles aux défauts surfaciques et subsurfaciques.Cette thèse présente les travaux menés dans le but de développer un système de SHM par ondes guidées capable de détecter, localiser et dimensionner efficacement les défauts dans des structures aéronautiques assimilables à des plaques, en matériaux composites ou en aluminium. Des simulations et des méthodes d'apprentissage sont utilisées pour déterminer les caractéristiques principales des ondes guidées propagées, notamment les vitesses de phase et de groupe ainsi que la fonction de Green 3D. Celles-ci sont ensuite utilisées pour traiter les signaux des ondes guidées afin de produire des images représentant l'intégrité des structures étudiées. Ce travail comprend également une étude approfondie des algorithmes d'imagerie DAS, MV et Excitelet, les plus prometteurs parmi ceux de la littérature, une évaluation de leurs performances par analyse statistique sur une grande base de données de résultats de simulations d'imagerie par ondes guidées et propose une méthode d'imagerie parcimonieuse.Alors que la détection et la localisation des défauts à partir de l'analyse des images est aisée, le dimensionnement du défaut est un problème plus complexe en raison de sa forte dimensionnalité et de sa non-linéarité. Il est démontré que ce problème peut être résolu par des méthodes d'apprentissage automatique sur une grande base de données de résultats de simulations d'imagerie par ondes guidées. Ces méthodes d'imagerie nécessitent cependant une référence, mesurée sur la structure dans un état supposé sain. Elles sont efficaces dans des conditions opérationnelles stationnaires mais sont sensibles aux variations de l'environnement et notamment aux fluctuations de température.Ce travail présente donc l'étude de la robustesse face aux effets thermiques des méthodes d'imagerie par ondes guidées et propose un modèle de détection de défauts capable d'analyser des résultats d'imagerie détériorés. Plusieurs techniques de compensation des effets thermiques sont étudiées et des améliorations sont proposées. Leur efficacité est validée pour les plaques d'aluminium mais des améliorations supplémentaires sont nécessaires pour les étendre aux plaques de composites
A guided wave-based structural health monitoring (SHM) system aims at determining the integrity of a wide variety of plate-like structures, including aircraft fuselages, pipes, tanks etc. It relies on a sparse array of piezoelectric transducers for guided waves (GWs) excitation and sensing. With a number of benefits, these waves are standing out among other methods as a promising method for the inspection of large structures. They can propagate on significant distances with small attenuation while being sensitive to surface and subsurface defects.This thesis presents studies conducted with the purpose of developing such a GWs-based SHM system that is capable of efficient defect detection, localization and sizing aeronautical plate-like structures made of aluminum and composite materials. Simulation and data-driven approaches are presented for determining principal characteristics of propagating GWs, namely modal group and phase velocities, 3D Green's functions etc. in structures of interest. They are then used for GWs signals processing in order to compute images representing the integrity of studied structures. This work also provides a comprehensive overview of DAS, MV and Excitelet defect imaging algorithms, determines their performance using statistical analysis of an extensive dataset of simulated guided waves imaging (GWI) results and proposes a method for sparse defect imaging.While defect detection and localization are straightforward from the image analysis, the defect sizing is a more complex problem due to its high dimensionality and non-linearity. It is demonstrated that this problem can be solved by means of machine learning methods, relying on an extensive database of simulated GWI results. Aforementioned defect imaging methods are baseline demanding. They are efficient under stationary operational conditions but vulnerable to environmental variations, especially to the temperature fluctuation.Finally, this work presents studies on the robustness of GWI methods against thermal effects, and a defect detection model capable of analyzing deteriorated GWI results is proposed. Different techniques for thermal effects compensation are reviewed, and improvements are proposed. Their effectiveness is validated for aluminum plates but further improvements are required to translate these techniques to composite plates

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Mazzamurro, Aurélien. „Étude du couplage piézo-magnétique dans les guides d’ondes électro-acoustiques hyperfréquences : application aux capteurs de champ magnétique“. Thesis, Ecole centrale de Lille, 2020. http://www.theses.fr/2020ECLI0008.

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Les hétérostructures piézo-électro-magnéto-élastiques en couches minces se dressent comme des candidats prometteurs dans le domaine de la détection de champ magnétique de faible intensité et spatialement résolu, à température ambiante. Cette thèse porte donc sur l’étude du couplage piézo-magnétique dans les guides d’ondes électro-acoustiques hyperfréquences basés sur des couches minces nanostructurées à anisotropie uniaxiale, déposées sur substrats piézoélectriques. Premièrement, les structures investiguées sont constituées d’un empilement multicouche TbCo2/FeCo déposé sur un substrat de Quartz ST-X90°. Celles-ci permettent d’exploiter le mode transverse horizontal présentant la plus grande sensibilité. La possibilité d’induire, par le champ magnétique, une conversion de mode acoustique, pouvant potentiellement être utilisé dans la conception de capteurs de champ magnétique ultra-sensibles, est également démontrée. Cette étude permet aussi de valider le modèle théorique piézo-magnétique développé, par la mesure des variations de vitesse de phase des ondes élastiques guidées en fonction de l’intensité et de la direction du champ magnétique. Ensuite, deux concepts de mesure sont proposés afin d’améliorer la résolution de la mesure des capteurs, dépendante essentiellement du temps de transit de l’onde élastique dans la couche magnéto-élastique : la réflectométrie temporelle acoustique et l’exploitation d’un mode de cavité localisé dans la couche magnéto-élastique. Enfin, l’optimisation du couple anisotropie uniaxiale/magnétostriction de l’empilement multicouche TbCo2/FeCo est abordée, celui-ci jouant un rôle majeur dans la sensibilité et la dynamique des capteurs étudiés
Thin-film piezo-electro-magneto-elastic heterostructures stand out as promising candidates in the field of spatially resolved, low-intensity magnetic field detection at room temperature. Thus, this thesis focuses on the study of piezomagnetic coupling in microwave electro-acoustic waveguides based on nanostructured thin films with uniaxial anisotropy, deposited on piezoelectric substrates. Firstly, the investigated structures consist in a TbCo2/FeCo multilayer stack deposited on a ST-X90° Quartz substrate, to exploit the horizontal transverse mode presenting the highest sensitivity. The possibility to induce, via the magnetic field, an acoustic mode conversion, potentially usable in the design of ultra-sensitive magnetic field sensors, is also demonstrated. In addition, this study validated the developed theoretical piezo-magnetic model, by measuring the phase velocity variations of the guided elastic waves as a function of the intensity and direction of the applied magnetic field. Then, two measurement concepts are proposed in order to improve the resolution of the sensor measurement, which depends essentially on the transit time of the elastic wave in the magneto-elastic layer: the acoustic time domain reflectometry and the exploitation of a cavity mode located in the magneto-elastic layer. Finally, the optimization of the uniaxial anisotropy/magnetostriction couple of the TbCo2/FeCo multilayer stack is addressed, as it plays a major role in the sensitivity and dynamics of the studied sensors

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Bücher zum Thema "Guided elastic waves"

Samsonov, A. M. Introduction to guided nonlinear elastic waves. Harlow, Essex, England: Longman Scientific & Technical, 1994.

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Ostachowicz, W. M. Guided waves in structures for SHM: The time-domain spectral element method. Chichester, West Sussex: Wiley, 2012.

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Royer, Daniel, und Eugene Dieulesaint. Elastic Waves in Solids I: Free and Guided Propagation. Springer, 2010.

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Royer, Daniel, und Eugene Dieulesaint. Elastic Waves in Solids I: Free and Guided Propagation (Advanced Texts in Physics). Springer, 2000.

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Buchteile zum Thema "Guided elastic waves"

Wei, Peijun. „Guided Waves“. In Theory of Elastic Waves, 283–358. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5662-1_6.

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Li, Y., und R. B. Thompson. „Propagation of Guided Elastic Waves in Orthotropic Plates“. In Review of Progress in Quantitative Nondestructive Evaluation, 189–96. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0817-1_24.

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Simpson, W. A., und R. W. McClung. „Guided Elastic Interface Waves for Ceramic Joint Evaluation“. In Review of Progress in Quantitative Nondestructive Evaluation, 2019–26. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0817-1_256.

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Cho, Youn Ho, Won Deok Oh und Joon Hyun Lee. „Long-Range Pipe Monitoring with Elastic Guided Waves“. In Key Engineering Materials, 2176–81. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-978-4.2176.

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Kopilevich, Yu I. „Regular inhomogeneous anisotropic elastic waveguides: an implementation of the abstract theory“. In Spectral Theory of Guided Waves, 211–72. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003209645-7.

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Tribikram, Kundu. „Guided Elastic Waves – Analysis and Applications in Nondestructive Evaluation“. In Mechanics of Elastic Waves and Ultrasonic Nondestructive Evaluation, 113–214. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018.: CRC Press, 2019. http://dx.doi.org/10.1201/9781138035942-2.

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Gaul, Tobias, Uwe Lieske, Kristian Nikolowski, Peter Marcinkowski, Mareike Wolter und Lars Schubert. „Monitoring of Lithium-Ion Cells with Elastic Guided Waves“. In Lecture Notes in Civil Engineering, 742–53. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64908-1_69.

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Every, A. G., und A. A. Maznev. „Guided Elastic Waves at Periodically Structured Surfaces and Interfaces“. In IUTAM Symposium on Recent Advances of Acoustic Waves in Solids, 107–17. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9893-1_10.

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Gopalakrishnan, Karthik, Mahindra Rautela und Yiming Deng. „Deep Learning Based Identification of Elastic Properties Using Ultrasonic Guided Waves“. In Lecture Notes in Civil Engineering, 77–90. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64908-1_8.

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Konferenzberichte zum Thema "Guided elastic waves"

Cho, Younho, Joseph L. Rose, Chong Myoung Lee und Gregory N. Bogan. „Elastic Guided Waves in Composite Pipes“. In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2813.

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An efficient technique for the calculation of guided wave dispersion curves in composite pipes is presented. The technique uses a forward-calculating variational calculus approach rather than the guess and iterate process required when using the more traditional partial wave superposition technique. The formulation of each method is outlined and compared. The forward-calculating formulation is used to develop finite element software for dispersion curve calculation. Finally, the technique is used to calculate dispersion curves for several structures, including an isotropic bar, two multi-layer composite bars, and a composite pipe.

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CHEN, W. Q., Y. Q. GUO, H. M. Wang und J. W. SHAO. „GUIDED WAVES IN ANISOTROPIC ELASTIC LAMINATED PLATES“. In Proceedings of the 2006 Symposium. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812770165_0050.

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Gorski, Dmitri, Uwe Lieske, Robert Neubeck und Peder Solum Witsø. „Non-Intrusive Level Measurement Using Guided Elastic Waves“. In Offshore Technology Conference Brasil. OTC, 2023. http://dx.doi.org/10.4043/32721-ms.

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Abstract Accurate level measurement in process vessels is important for safety, production optimization and control as well as for optimization of chemical additives. Most of the level measurement sensors used in oil and gas production today are Differential Pressure (DP) transmitters, displacers and, sometimes, Guided Wave Radar (GWR). More advanced profiler-type sensors are used more rarely and most often only for process analytics. Almost all of the commercially available level measurement instruments are intrusive, meaning that they require a flange or penetration for installation and maintenance. In practice, this implies that installation and maintenance on an existing installation have to be conducted during a turnaround. This makes such a project prohibitively expensive considering the cost of turnaround time and the fact that a turnaround on an offshore platform is only performed once every 1-4 years. This work describes pilot trials with a novel non-intrusive level measurement system that utilizes Guided Elastic Waves (GEW) for attenuation tomography. Pilot experiments were carried out in a model separator with an internal diameter of 1.00 m and length 3.75 m. The pilot separator which was filled to pre-determined levels with tap water, mineral oil and construction sand. Flow of water was induced in some of the experiments. Phase levels were recorded manually through a sight glass and compared to readings generated by the novel measurement system. Experiments showed that the novel level measurement system is able to detect levels of sand and liquid as well as clean water/oil interface levels with very high accuracy. Flow had no significant influence on the measurement results and the sensor output remained stable over the cause of one month. After the successful testing, the system has been qualified for its first trial on an offshore installation. In addition to an offshore pilot, more R&D needs to be conducted in order to develop capabilities to measure emulsion and foam interface layers as well as to determine how fouling by scale, waxes and other impurities present in a full-scale separator influence the measurement.

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Znak, P. E., B. M. Kashtan und V. N. Troyan. „Guided Waves Leaking From High-Velocity Elastic Layer“. In 7th EAGE Saint Petersburg International Conference and Exhibition. Netherlands: EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201600113.

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ZIMMERMANN, EUGEN, ARTEM EREMIN und ROLF LAMMERING. „Guided Elastic Waves in CFRP Plates with Random Material Properties“. In Structural Health Monitoring 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/shm2017/13854.

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Danicki, E. „Elastic and EM waves guided by periodic cracks or strips“. In 1993 IEEE Ultasonics Symposium. IEEE, 1993. http://dx.doi.org/10.1109/ultsym.1993.339478.

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Sotiropoulos, James A., und Sudhakar Nair. „Propagation characteristics of guided waves in layered elastic orthotropic materials“. In 6th Annual International Symposium on NDE for Health Monitoring and Diagnostics, herausgegeben von Tribikram Kundu. SPIE, 2001. http://dx.doi.org/10.1117/12.434197.

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Shao, Shixuan, Rongyu Xia und Zheng Li. „Piezoelectric elastic metasurface for tunable guided waves control in plate“. In Metamaterials, Metadevices, and Metasystems 2021, herausgegeben von Nader Engheta, Mikhail A. Noginov und Nikolay I. Zheludev. SPIE, 2021. http://dx.doi.org/10.1117/12.2593858.

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Legrand, F., B. Gerardin, J. Laurent, C. Prada und A. Aubry. „Negative Reflection and Refraction of Guided Elastic Waves– Metamaterials 2018“. In 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). IEEE, 2018. http://dx.doi.org/10.1109/metamaterials.2018.8534112.

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Datta, Subhendu K., und Osama Mukdadi. „Ultrasonic Guided Waves in Thin Orthotropic Layers: Exact and Approximate Analyses“. In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1650.

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Abstract Exact and approximate analyses of ultrasonic guided wave propagation in thin orthotropic layers are presented in this work. Exact solutions to the equations governing the dependence of guided wave propagation speeds on the elastic constants characterizing the anisotropic properties of the layers are presented and compared with the predictions of first order approximate theories for extensional and flexural waves in thin plates. Comparison with available experimental results for dispersion of these waves in thin sheets of different types of papers leads to the confirmation or modification of the elastic constants and density reported for these papers. A particular focus of this study is the coupling of three types of guided waves (extensional (S), flexural (A), and shear-horizontal (SH)) due to anisotropy of the material. It is shown that there are significant changes in the dispersion characteristics of these modes at certain frequencies, which can be exploited to measure the in-plane elastic properties of thin layers. Another focus is to study the limitations of approximate results when compared with exact solutions for wave propagation in different directions. In general good agreements are found at low frequencies.

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Berichte der Organisationen zum Thema "Guided elastic waves"

Simpson, Jr., W., und R. McClung. An investigation of elastic guided waves for ceramic joint evaluation. Office of Scientific and Technical Information (OSTI), Oktober 1989. http://dx.doi.org/10.2172/5260427.

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