Дисертації з теми "Guided wave ultrasonics"
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Levine, Ross M. "Ultrasonic guided wave imaging via sparse reconstruction." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51829.
Повний текст джерелаKogia, Maria. "High temperature electromagnetic acoustic transducer for guided wave testing." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/14491.
Повний текст джерелаFateri, Sina. "Advanced signal processing techniques for multimodal ultrasonic guided wave response." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11657.
Повний текст джерелаGandhi, Navneet. "Determination of dispersion curves for acoustoelastic lamb wave propagation." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37158.
Повний текст джерелаBrath, Alexander J. "Advanced techniques for ultrasonic imaging in the presence of material and geometrical complexity." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1510053440115292.
Повний текст джерелаUhrig, Matthias Pascal. "Numerical simulation of nonlinear Rayleigh wave beams evaluating diffraction, attenuation and reflection effects in non-contact measurements." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54368.
Повний текст джерелаLuker, L. Dwight. "Investigation of a cylindrical nonacoustic-wavenumber calibration array." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15885.
Повний текст джерелаPezant, Joannes Charles. "High temperature thickness monitoring using ultrasonic waves." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26577.
Повний текст джерелаCommittee Chair: Michaels, Jennifer; Committee Member: Jacobs, Laurence; Committee Member: Michaels, Thomas. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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.
Повний текст джерелаBingham, Jill Paisley. "Ultrasonic guided wave interpretation for structural health inspections." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539623538.
Повний текст джерелаPavlakovic, Brian Nicholas. "Leaky guided ultrasonic waves in NDT." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/7907.
Повний текст джерелаSpratt, 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.
Повний текст джерелаBartoli, 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.
Повний текст джерелаTitle from first page of PDF file (viewed December 3, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 311-325).
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/.
Повний текст джерелаVallet, Quentin. "Predicting bone strength with ultrasonic guided waves." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066626.
Повний текст джерелаWe aimed at developing new ultrasound-based biomarkers of cortical bone to enhance fracture risk prediction in osteoporosis. Our approach was based on the original concept of measuring ultrasonic guided waves in cortical bone. The bi-directional axial transmission technique was used to measure the guided modes propagating in the cortical envelope of long bones (i.e., the radius). Strength-related structural and material properties of bone were recovered from the dispersion curves through an inversion scheme. To this goal, a fully automatic inverse problem based on genetic algorithms optimization, using a 2-D transverse isotropic free plate waveguide model was developed. The proposed inverse procedure was first tested on laboratory-controlled measurements performed on academic samples with known properties. Then, the feasibility of estimating cortical properties of ex vivo radius specimens was assessed. The inferred bone properties were validated by face-to-face comparison with reference values determined by a set of independent state-of-the art technologies, including X-ray micro-computed tomography (thickness, porosity) and resonance ultrasound spectroscopy (stiffness). A good agreement was found between reference values and estimates of thickness, porosity and stiffness. Lastly, the method was extended to in vivo measurements, first, by ensuring the validity of the waveguide model in presence of soft tissues to demonstrate the feasibility of measuring experimental dispersion curves in vivo and infer from them bone properties. Estimated cortical thickness values were consistent with actual values derived from high resolution peripheral computed tomography
Deere, Matthew. "Guided wave evaluation of pipes using the first and second order torsional wave mode." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15307.
Повний текст джерелаMograne, Mohamed Abderrahmane. "Viscosimétrie ultrasonore ultra large bande." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS089/document.
Повний текст джерелаThe main goal of this thesis is to set specific piezoelectric elements emitting longitudinal waves (L) on a well-known container in the field of biomedical and chemistry (a test tube) and to implement with some optimizations various ultrasonic methods to measure viscosities quickly, without changing the measurement bench. The measurement has to be done from a few Hz to several tens of megahertz around room temperature. Up to now it is possible to determine in a few minutes the rheological behavior of the liquid studied thanks to the evaluation of its shear viscosity. Furthermore, the viscosity range reached is extremely wide: the measurements are possible from a few tens of mPa.s to several hundred Pa.s. Finally, beyond quantitative results in terms of viscosity, the measurement bench can also be used to qualitatively monitor reactions (polymerization for example)
Valle, Christine. "Guided circumferential waves in annular structures." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17271.
Повний текст джерелаZlatev, Zahari. "Ultrasonic guided wave propagation in pipes coated with viscoelastic materials." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/12753.
Повний текст джерелаMarty, Pierre Noel. "Modeling of ultrasonic guided wave field generated by piezoelectric transducers." Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/7222.
Повний текст джерелаThornicroft, Keith. "Ultrasonic guided wave testing of pipelines using a broadband excitation." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/14001.
Повний текст джерелаWilley, 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.
Повний текст джерелаAutrusson, 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.
Повний текст джерелаBelanger, Pierre. "Feasibility of thickness mapping using ultrasonic guided waves." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5503.
Повний текст джерелаBuys, B. J. "Rock bolt condition monitoring using ultrasonic guided waves." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-06222009-135318/.
Повний текст джерелаChan, 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.
Повний текст джерелаLi, Zongbao. "Crack detection in annular components by ultrasonic guided waves." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15920.
Повний текст джерелаKrishna, Aditya. "Topological Imaging of Tubular Structures using Ultrasonic guided waves." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0111.
Повний текст джерелаTubular structures are widely used in a variety of industries such as Aerospace, Oil and Gas, Nuclear, etc. Non Destructive Evaluation (NDE) of these structures plays a crucial role during it’s life cycle. In order to test large structures with limited accessibility, guided wave testing was developed as a viable solution. Due to the nature of these waves, they are able to propagate over large distances without losing much of their energy. However, they are also complex in that their velocity is frequency dependent i.e. they are dispersive. Conventionally, guided wave testing require costly finite element simulations. This thesis offers an alternative to such simulations with a quick and robust method to simulate guided wave propagation in tubular structures.Based on these calculations, the aim of this work is to obtain the 3d topological image of multilayered isotropic tubular structures using ultrasonic guided waves to locate defects. A mathematical model has been proposed where the wave equation is converted to an ordinary differential equation with respect to radius 'r' using the Fourier and Laplace transforms for the spatial and temporal variables respectively. The partial wave solution, expressed as a combination of Bessel’s functions, allows for the creation of a fast robust semi-analytical algorithm to compute the Green function in tubular structures. A model to approximate numerical defects is then developed. The defect response is considered as the cumulative response of secondary sources, aiming to negate the incident and diffracted stress field present within it. Next, the numerical model is validated with experimental measurements.Finally, the technique of Topological Imaging is introduced. This method of imaging is based on the idea of performing a correlation between two wave fields for defect localization. The versatility and flexibility of the numerical tool in conjunction with the method of imaging is then successfully demonstrated by localising and imaging a multitude of numerical and experimental defects with dimensions as low as 1=40th of the wavelength
Advani, Siddharth Kishin Rose Joseph L. Zhang Qiming. "An ultrasonic guided wave inspection system for hard to access civil structures." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4435/index.html.
Повний текст джерелаSeifried, Robert. "Propagation of guided waves in adhesive bonded components." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19494.
Повний текст джерелаHaig, Alexander George. "The use of macro fiber composite transducers for ultrasonic guided wave based inspection." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/12840.
Повний текст джерелаPutkis, Osvaldas. "Ultrasonic guided wave structural health monitoring and its application to anisotropic composite material." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.680355.
Повний текст джерелаMueller, Martin Fritz. "Analytical investigation of internally resonant second harmonic lamb waves in nonlinear elastic isotropic plates." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31827.
Повний текст джерелаCommittee Chair: Laurence J. Jacobs; Committee Member: Jianmin Qu; Committee Member: Jin-Yeon Kim. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Leonard, Kevin Raymond. "Ultrasonic guided wave tomography of pipes: A development of new techniques for the nondestructive evaluation of cylindrical geometries and guided wave multi-mode analysis." W&M ScholarWorks, 2004. https://scholarworks.wm.edu/etd/1539616737.
Повний текст джерелаMa, Jian. "On-line measurements of contents inside pipes using guided ultrasonic waves." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/8168.
Повний текст джерелаSerey, Valentin. "Sélectivité modale d'ondes ultrasonores dans des guides d'ondes de section finie à l'aide d'éléments piézoélectriques intégrés pour le SHM." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0403/document.
Повний текст джерелаSHM systems (Structural Health Monitoring) based on ultrasonic guided waves propagation are used for large structures, e.g. in Aerospace or Civil Engineering. Lamb or SH waves are usually employed as they propagate over long distances in plate-like structures while probing the entire thickness. However less conventional modes propagate in wave guides with finite crosssection,such as bars, rails or pipes. The number of modes can be very high even at low frequencyin this type of guide, and it is important to carefully select a specific mode. Current methods for modal selectivity, based on the use of several emitters, usually consider identical PZT elements(same sensitivity, same frequency response, etc.) and do not account for real experimental conditions and possible differences (variable coupling between transducers, flawed alignment,variable electronic response, etc.). This work presents a global methodology for modal selectivity in waveguides with finite cross-section, using several piezoelectric elements attached to their surface. This selectivity is based on experimental measurements, with a 3D laser vibrometer,of the amplitudes of the modes generated by each emitter. An optimization process allows to inverse the problem in order to maximize the amplitude of the desired mode, then generated by exciting all the emitters at once. This process requires knowing dispersion curves as well as the displacements of the various modes, calculated with SAFE 2D method. The methodology is tested through numerical simulations and experiments on an aluminium rectangular bar instrumented with 8 PZT elements on top. The method efficiency to generate different pure modes,and to detect and locate calibrated defects, is demonstrated for the aluminium bar. Its potential for SHM application of more complex structures is studied, like a rail or an adhesively bonded composite structure
Liu, Chang. "Singular Value Decomposition Applied to Damage Diagnosis for Ultrasonic Guided Wave Structural Health Monitoring." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/402.
Повний текст джерелаLefevre, 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.
Повний текст джерелаThe deposition of thin layers on substrates is more and more required in many applications. For example, to reach high technical performance, bumpers or other parts are nickeled to improve their impermeability and resistance. Another example in microelectronics is the realization of transistors found in LCDs where they are associated with each pixel. The use of these layer/substrate structures is growing, so the importance of having non-destructive techniques to monitor and characterize them is well understood. The point in using ultrasonic waves for non-destructive testing and evaluation of various materials and structures is well known. In this work, the aim was to use guided waves to monitor and to characterize plaque-like structures. The main advantage of using these modes lies in their ability to test very large areas and inaccessible structures. For the generation and detection of guided waves, the laser ultrasonics technique was preferred. It is a broadband and non contact method which doesn't imply the use of coupling medium and which can be adapted to complex geometries. To take full advantage of this technique, it has been combined with neural networks in order to solve the inverse problem posed by the propagation of guided waves. As a result, an original, e cient and polyvalent characterization method has been obtained, which allowed us to determine the geometric properties and / or the elastic parameters of di erent plate-like structures. Structures made of silicon have been studied with this method. Finite element simulations and studies concerning the in uence of defects, including adhesion, on the waves propagation are also presented
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.
Повний текст джерелаA technique of Non-Destructive Testing (NDT) was developed for the generation and detection of Lamb waves propagating along large plates made of different materials (metal, polymer or fibre-reinforced composite). Based on the use of many elements closely coupled to the plate, this inspection technique differs from the classic Structural Health Monitoring (SHM) because all the transmitters or receivers are grouped in a very localized area, defined by the active surface of a phased array matrix probe, and are not permanently attached and distributed within or on the surface of the test structure. In addition, the principle (known) of the phase shift between the elements is applied to the probe for generating and receiving a pure Lamb mode in (or from) multiple directions along the plate. The delay laws applied to these elements, in transmit mode or receive mode, take into account the dispersive nature of the Lamb wave. Finally, a specific signal processing is applied to compensate the dispersion suffered by the guided waves during their propagation along the test piece. An experimental prototype and its finite element modeling are presented, as well as measurements and simulation results of its performances in terms of modal selectivity and angular directivity. For NDT applications, the construction of images, representing all parts of the test piece, which diffract the guided mode (edges, defects, holes, stiffeners, etc.), has demonstrated the potential (and some limits) of this technique for a quick inspection of large structures, including areas remote from the probe or areas difficult to access
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/.
Повний текст джерелаAhmed, 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.
Повний текст джерелаKhelfa, Haithem. "Identification des propriétés d'élasticité et d'amortissement d'une fibre isolée anisotrope par ultrasons laser : ouverture au cas des fibres naturelles." Thesis, Le Mans, 2015. http://www.theses.fr/2015LEMA1016/document.
Повний текст джерелаThis thesis focuses on the study of elastic and damping properties of micrometric fibers that are used for the reinforcementof composite materials. Homogeneous and circular artificial fibers were studied experimentaly by the application of the laser ultrasonics (LU) technique, which was coupled to modal identification based on the simulation of the vibration modes using finite element modeling. In the case of plant fibers, the application of the LU method requires prior knowledge of the 3D geometry of the single fiber in the measurement area. In order to determine the geometry of the fiber, we have developed anin-situ optical projection micro-tomography (OPT) device using the digital holography technique. This PhD thesis is organized around four chapters. The first chapter provides a state of the art of the micrometric fibers and the most common methods used to characterize their mechanical properties. The second chapter is elevated to numerical methods of calculation of the propagation of guided acoustic waves in cylindrical structures (solid cylinder, pipes, arbitrary cross-section). In order to predict the propagation of guided acoustic waves in such structures, several methods are presented. The third chapter is devoted to the experimental study of elastic properties and vibrational behavior of micrometric fibers using laser ultrasonics technique (LU). The last chapter of the manuscript presents the principle of the OPT method based on digital holography microscopy, performed in situ on the LU measurement area of the fiber, which will be used tocollect the actual 3D shape of a single flax fiber
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.
Повний текст джерелаKoreck, 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/.
Повний текст джерелаJacobs, Laurence, Committee Chair ; Qu, Jianmin, Committee Member ; Valle, Christine, Committee Co-Chair.
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.
Повний текст джерелаRodrigues, 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.
Повний текст джерелаStévenin, Mathilde. "Rayonnement des ondes ultrasonores guidées dans une structure mince et finie, métallique ou composite, en vue de son contrôle non-destructif." Thesis, Valenciennes, 2016. http://www.theses.fr/2016VALE0037/document.
Повний текст джерелаDifferent models are developed to provide generic tools for simulating nondestructive methods relying on elastic guided waves applied to metallic or composite plates. Various inspection methods of these structures exist or are under study. Most of them make use of ultrasonic sources of finite size; all are sensitive to reflection phenomena resulting from the finite size of the monitored objects. The developed models deal with transducer diffraction effects and edge reflection. As the interpretation of signals measured in guided wave inspection often uses the concept of modes, the models themselves are explicitly modal. The case of isotropic plates (metal) and anisotropic (multilayer composites) are considered; a general approach under the stationary phase approximation allows us to consider all the cases of interest. For the first, the validity of a Fraunhofer-like approximation leads to a very efficient computation of the direct and reflected fields radiated by a source. For the second, special attention is paid to the treatment of caustics. The stationary phase approximation being difficult to generalize, a model (so-called “pencil model”) of more geometrical nature is proposed with a high degree of genericity. It chains terms of isotropic or anisotropic propagation and terms of interaction with a boundary. The equivalence of the stationary phase approximation and the pencil model is demonstrated in the case of the radiation and reflection in an isotropic plate, for which an experimental validation is proceeded
McLean, Jeffrey John. "Interdigital Capacitive Micromachined Ultrasonic Transducers for Microfluidic Applications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7625.
Повний текст джерелаHarley, Joel B. "Data-Driven, Sparsity-Based Matched Field Processing for Structural Health Monitoring." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/392.
Повний текст джерелаDuroux, 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.
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