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Dissertations / Theses on the topic 'Eddy current'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Harrison, David John. "Eddy-current imaging of cracks." Thesis, University of Surrey, 1985. http://epubs.surrey.ac.uk/847494/.

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As a consequence of metal fatigue, cracks can develop and grow in operational aircraft. Periodic inspections must be made in order to detect and repair them before they reach a dangerous length. Cracks which grow from holes are a significant problem for aircraft since the wings and fuselage can contain many thousands of fasteners, or rivets. Since it is impractical to remove them all, inspection must be made with them installed. Research into the application of eddy currents to this problem has led to the development of a scanning procedure in which a small coil is moved around the circumferen

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2

Yazgan, Selahattin Baris. "Modeling of Eddy Current Separation." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/92000.

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Eddy current separation aims to recover non-ferrous metals from non-metals utilizing electromagnetic interactions. In order to describe the separation process, a representative model is needed that can accurately calculate the induced forces. Such a model can be used to optimize the efficiency of current equipment as well as designing ones that can offer new capabilities. Models proposed so far for the separation process, using traditional approaches to calculate forces, had limited success due to complex nature of electromagnetic interactions. In this dissertation, a novel method for calcula

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3

Varonis, Orestes J. "Eddy Current Characterization of Stressed Steel and the Development of a Shaft Torque Eddy Current System." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1221065617.

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4

Lai, Yuqing. "Eddy current displacement sensor with LTCC technology." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976297167.

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5

Jenkins, Stephen Allen. "Theoretical models of eddy current interaction with defects." Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/1047/.

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6

Harfield, Nicola. "Analytical methods in eddy current non-destructive evaluation." Thesis, University of Surrey, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308405.

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The two-dimensional problem of a long crack in a non-magnetic, half-space conductor lying perpendicular to the flow of eddy-currents induced by a one-dimensional external current sheet is studied in the context of eddy-current non-destructive evaluation. Impedance changes due to closed, surface-breaking cracks and deep, subsurface cracks are calculated. The Wiener-Hopf technique is used to obtain an approximate solution for the magnetic field scattered by a subsurface crack and hence the impedance change. The solution is accurate to within 5% for cracks whose edges lie more than one electromag

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7

Meuleners, Michael Joseph. "A numerical study of the mesoscale eddy dynamics of the Leeuwin Current system /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2007.0134.

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8

Huo, Xi Ting (Bob). "New Model of Eddy Current Loss Calculation and Applications for Partial Core Transformers." Thesis, University of Canterbury. Electrical and Computer Engineering, 2009. http://hdl.handle.net/10092/3631.

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This thesis first explains the eddy current and the phenomenon of skin effect, where the resultant flux flows near the surface of the metal. A new flux direction perspective is created for steel laminations, from which derivations of the eddy current resistance and power losses in different directions are developed assuming uniform flux conditions. The developed method compares with a proposed theory through experimental data. The results from the comparison support the validity of the developed derivations. Two uniform flux generators and their billets construction are introduced. The power l

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9

Rodriguez, Gutierrez Sergio. "FPGA based digital electromagnetic sensing technique for detection of pit corrosion." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/fpga-based-digital-electromagnetic-sensingtechnique-for-detection-of-pit-corrosion(7e9abd26-7658-42da-b4a3-04a1a1f302a4).html.

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This thesis describes the development of an eddy current instrument and its application in detecting early-stage pitting corrosion. Eddy current testing has previously been used in Non-Destructive Testing (NDT) applications detecting large defects, like cracks. However, the challenge of detecting corrosion pits of less than 1mm³ remains unaddressed. This research involved the design of a Field Programmable Gate Array (FPGA)-based eddy current instrument, and the design and modelling of a novel differential electromagnetic sensor. The FPGA provided accurate synchronisation among the major elect

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10

Iravani, Ebrahim. "Laser and eddy current measuring techniques for agile manufacturing." Doctoral thesis, KTH, Production Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3312.

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11

Simon, Lilian [Verfasser]. "Direct and inverse transient eddy current problems / Lilian Simon." Mainz : Universitätsbibliothek Mainz, 2014. http://d-nb.info/1061142264/34.

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12

Haywood, Nicholas Charles. "Eddy-current imaging of cracks by inverting field data." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/843519/.

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Non-destructive evaluation is concerned with the detection and characterisation of flaws. In eddy-current inspection, measurements of the electro-magnetic field are made at the surface of a flawed conductor, in an oscillating electric or magnetic field. The aim of this study is to develop an eddy-current method of imaging flaws based on measurements of the magnetic field data. In the presence of an oscillating current, it is shown that the physical behaviour of a thin crack can be modelled by a layer of electric dipoles. Green's functions are introduced, relating the dipole distribution on the

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13

Kyte, David John. "Magnetic induction tomography and techniques for eddy-current imaging." Thesis, University of Surrey, 1985. http://epubs.surrey.ac.uk/707/.

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14

Gething, James Douglas. "Eddy current induced breakdown of the quantum Hall effects." Thesis, University of Exeter, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425323.

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15

Waterman, Stephanie N. "Eddy-mean flow interactions in western boundary current jets." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55330.

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Thesis (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2009.<br>Includes bibliographical references (p. 257-264).<br>This thesis examines the nature of eddy-mean flow interactions in western boundary current jets and recirculation gyre dynamics from both theoretical and observational perspectives. It includes theoretical studies of eddy-mean flow interactions in idealized configurations relevant to western boundary current jet systems, namely (i) a study

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16

Lippi, Silvio. "Analysis of rotor eddy-current losses in synchronous motors." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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La stima delle perdite rotoriche per correnti parassite (Eddy currents) è cruciale nella progettazione dei moderni motori SPM. Poichè le loro prestazioni dipendono fortemente da esse. I motori devo essere progettati in modo da prevenire eccessive perdite rotoriche, le quali possono portare alla demagnetizzazione dei magneti e ad un deterioramento delle performance generali della macchina. Nel capitolo 1 sono illustati i principi fisici che descrivono il comportamento dei motori elettrici e delle perdite rotoriche per correnti parassite. Sono poi discusse le proprietà dei materiali impiegati ne

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17

Molteno, Matthew Robert. "Eddy current detection of fatigue cracks in drill pipes." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/6084.

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Includes abstract.<br>Includes bibliographical references.<br>The Vertical Marine Mining technique is a lucrative method used by De Beers to recover bottom lying diamonds from the seabed, mainly off the coast of Namibia. The method employs a 200m length pipe-drilling structure rotated from the surface and acting as a conduit through which the disturbed sediment is transported to the surface for processing. However, cyclic operating stresses combined with corrosion have tended to cause circumferential fatigue cracks to develop on the outside surface of the drill pipe and propagate inwards. As n

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18

Pozza, Cristian. "Application of HPC in eddy current electromagnetic problem solution." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423836.

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As engineering problems are becoming more and more advanced, the size of an average model solved by partial differential equations is rapidly growing and, in order to keep simulation times within reasonable bounds, both faster computers and more efficient software implementations are needed. In the first part of this thesis, the full potential of simulation software has been exploited through high performance parallel computing techniques. In particular, the simulation of induction heating processes is accomplished within reasonable solution times, by implementing different parallel direct s

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19

Meuleners, Michael Joseph. "A numerical study of the mesoscale eddy dynamics of the Leeuwin Current system." University of Western Australia. School of Environmental Systems Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0134.

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[Truncated abstract] The study of eastern ocean boundary currents has been principally restricted to the Pacific and Atlantic ocean regions. The traditional view of the circulation near eastern ocean boundaries is that upwelling-favourable winds force surface waters offshore, leading to upwelling of cold, nutrient-rich subsurface water at the coast, the formation and offshore advection of a coastal front, and the generation of alongshore currents, generally having an equatorward surface flow and a poleward undercurrent. The eastern ocean boundary system of the southern Indian Ocean, off the we

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20

Lee, Eunjung. "FOSLL* for eddy current problems with three-dimensional edge singularities." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3178348.

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21

Sires, James Gary. "Lagrangian measurements of eddy characteristics in the California current system." Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8606.

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Approved for public release; distribution is unlimited<br>During the Eastern Boundary Current program in 1993, 96 Argos-tracked surface drifters, drogued to 15 m depth, and satellite thermal imagery were used to provide a description of the mesoscale features in the California Current System off the northern California coast. The drifter movements and satellite images revealed a highly energetic series of filaments and eddies that dominated the summer flow field off the coast, similar to those noted in the earlier CODE, OPTOMA, and CTZ studies. Winter mesoscale activity in the region was less

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22

Cipriano, Nicholas J. "Analysis of eddy resolving model of the California Current System." Thesis, Monterey, California. Naval Postgraduate School, 1998. http://hdl.handle.net/10945/7907.

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Approved for public release; distribution is unlimited<br>A high-resolution, multi-level, primitive equation ocean model is used to investigate the combined role of seasonal wind forcing, thermohaline gradients, and coastline irregularities on the formation of currents, meanders, eddies, and filaments in the California Current System from 22.5 deg N to 47.5 deg N. An investigation of the dynamical reasons for the generation and growth of meanders and eddies is conducted along with a sensitivity study to investigate the formation of the Davidson Current. Model results are consistent with the ge

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23

Johnson, Marcus James. "Pulsed eddy-current measurements for materials characterization and flaw detection." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/966/.

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24

Ammanambakkam, Nagarajan Dhivya. "Design of HF Forward Transformer Including Harmonic Eddy Current Losses." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1292874300.

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25

Jones, Travis Hamilton. "Analysis and Optimization of Eddy Current Detection in Animal Tissue." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398919426.

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26

Ingabire, Annick, and Robin Olsson. "Standardization of Eddy Current Testing Calibration for Valve Spring Wire." Thesis, KTH, Industriell produktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232712.

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Elektromagnetisk provning (ECT) har blivit en av de mest använda metoderna för attkvalitetssäkra produkter där icke-destruktiv testning av material krävs. Vid provning av ståltrådinteragerar utrustningen med det testade materialet och upptäcker ytdefekter och, i vissomfattning, om strukturen skiljer sig från det kalibrerade provet. Om produkten befinner sigutanför specifikationen, skrotas den eller ombearbetas. Denna Mastersuppsats undersökerkalibreringsförfarandet för elektromagnetisk provning som utförs av Suzuki Garphyttan, som är enav de största tillverkarna i världen av ventil- och transm

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27

Parks, Andrew Brad. "Observing Eddy Variability Using HF Radar in the Straits of Florida." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/174.

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A dual-station high frequency Wellen Radar (WERA), transmitting at 16.045 MHz, has been deployed along the Eastern Florida Shelf (EFS). From September 2004 to June 2005, a moored acoustic Doppler current profiler (ADCP) acquired subsurface current measurements within the radar footprint along the shelf break at 86-m depth. The shallowest ADCP bin located at 14-m depth is used as a comparison for the WERA surface measurements. The RMS differences range from 0.1 to 0.3 m s super -1 between the surface and 14-m depth, with good agreement over most of the period. Regression analyses indicate slop

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28

Viebahn, Jan [Verfasser]. "Eddy-driven transports in the Antarctic Circumpolar Current system / Jan Viebahn." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1020615753/34.

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29

Razavi, Hamideh Keshik Nevis. "An axial flux eddy current coupling for a mild hybrid powertrain." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431099.

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30

Simm, Anthony. "Quantitative interpretation of magnetic field measurements in eddy current defect detection." Thesis, University of Newcastle Upon Tyne, 2013. http://hdl.handle.net/10443/1809.

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For many years, the theoretical and experimental study of eddy current non-destructive evaluation (NDE) has been conducted separately, as most models were not suited to practical industrial applications. The aim of this work is to bridge this gap by investigating the relationship between magnetic fields and defects using both modelling and experimental study and to link these results to quantitative NDE. In this work, 3D FEM numerical simulations are used to predict the response of an eddy current probe being scanned over the area of a defect and understand the underlying change in magnetic fi

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31

Sheikhi, Farid. "Entropy Filter for Anomaly Detection with Eddy Current Remote Field Sensors." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31100.

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We consider the problem of extracting a specific feature from a noisy signal generated by a multi-channels Remote Field Eddy Current Sensor. The sensor is installed on a mobile robot whose mission is the detection of anomalous regions in metal pipelines. Given the presence of noise that characterizes the data series, anomaly signals could be masked by noise and therefore difficult to identify in some instances. In order to enhance signal peaks that potentially identify anomalies we consider an entropy filter built on a-posteriori probability density functions associated with data series. Thres

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32

Travis, Clive Hathaway. "The inverse problem and applications to optical and eddy current imaging." Thesis, University of Surrey, 1989. http://epubs.surrey.ac.uk/804869/.

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33

Mecrow, B. C. "The numerical calculation of three dimensional eddy current fields in turbogenerators." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.346416.

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34

Abbas, Al-Byati N. "The eddy-current damping of synchronous machines with solid cylindrical rotors." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330125.

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35

Matarezi, João Carlos. "Aplicação do ensaio de Eddy Current Phased Array em componentes aeroespaciais." Universidade de Taubaté, 2009. http://www.bdtd.unitau.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=329.

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Na área de Ensaios Não Destrutivos, o ensaio por eddy current (correntes parasitas) é uma técnica eletromagnética largamente utilizada nas indústrias aeroespacial, nuclear e petroquímica. Esse ensaio detecta descontinuidades superficiais e subsuperficiais, prevenindo acidentes. A técnica phased array surgiu para suprir carências, como o enorme tempo gasto para execução do ensaio em materiais de geometria complexa e falta de registro do ensaio. Essa técnica, já bastante utilizada em outros países, ainda é pouco utilizada no Brasil, por não haver estudos que comprovem a viabilidade econômica, os

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36

Adewale, Ibukun Dapo. "Multiple parameters based pulsed eddy current non-destructive testing and evaluation." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2766.

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Eddy current sensing technique is widely used primarily because of its high tolerance to harsh environments, low cost, broad bandwidth and ease of automation. And its variant, pulsed eddy current offers richer information of target materials. However, accurate detection and characterisation of defects remains a major challenge in the petro-chemical industry using this technique which leads to spurious detection and false alarm. A number of parameters are contributory, amongst which is the inhomogeneity of the materials, coupling variation effect and relatively large lift-off effect due to coat

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37

Wilson, Thomas Lawler. "A multi-coil magnetostrictive actuator." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28243.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Zinn, Ben T.; Committee Member: Book, Wayne; Committee Member: Glezer, Ari; Committee Member: Neumeier, Yedidia; Committee Member: Seitzman, Jerry.

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38

Nalladega, Vijayaraghava. "Design and Development of Scanning Eddy Current Force Microscopy for Characterization of Electrical, Magnetic and Ferroelectric Properties with Nanometer Resolution." University of Dayton / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1249514169.

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39

Mata, Silvester Galvan. "Continuous measurement of aging response in aluminum alloys by eddy current methods." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA277233.

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40

Zainal, Abidin Ilham Mukriz. "Modelling and experimental investigation of eddy current distribution for angular defect characterisation." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1308.

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Current industrial requirements for nondestructive testing demand defect quantification rather than simple defect detection. This is not a simple task as defects in components, such as cracks, rarely have a simple geometrical shape. Therefore, the influence of defect shape and orientation and its effect on the inspection results needs to be addressed to avoid misinterpretation of the response signals and for a quantitative characterisation of defects. Finite element method (FEM) numerical simulations for eddy current non-destructive evaluation (ECNDE) can provide information on how the induced

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41

Esarey, John Gilbert. "Continuous measurement by eddy current methods of age hardening in aluminum alloys." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23592.

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Approved for public release; distribution is unlimited<br>Many materials processing operations such as age hardening heat treatments typically involve following predetermined time and temperature schedules to obtain the desired final material properties. The intelligent processing approach is to develop sensors for monitoring of material response to processing operation in real time. As an alloy age hardens its electrical resistivity changes. Hence, the process of aging can be monitored by measuring the change is resistivity relative to that of a non-age hardening material such as fully anne

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42

Tran, Gia Phuong. "Crack Inspection and simulations with Eddy Current Thermography for the Aerospace Industry." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/30044/30044.pdf.

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La Thermographie des Courants de Foucault (Eddy Current Thermography, ECT) est une méthode de contrôle non-destructif (CND) sans contact, et de nos jours il est utilisé dans une large gamme d'applications. Cette méthode combine les techniques de courants de Foucault et des techniques de thermographies de type CND afin de fournir une méthode efficace pour la détection des fissures. Dans cette méthode, le courant de Foucault est généré dans les échantillons métalliques. Si l'échantillon contient des fissures, le déplacement du courant et la propagation de la température à l'intérieur des échanti

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43

Wang, Jin, Masaki Sasai, and Kun Zhang. "Eddy current and coupled landscapes for nonadiabatic and nonequilibrium complex system dynamics." National Academy of Sciences, 2013. http://hdl.handle.net/2237/20625.

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44

Sreedharan, Nair Sreeju. "Rotor eddy current loss prediction and demagnetization assessment in permanent magnet machines." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/16067/.

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45

Qazalbash, Arfakhshand. "Rotor eddy current power losses in high speed permanent magnet synchronous generators." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/364580/.

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Rotor electromagnetic losses can be problematic in high speed permanent magnet synchronous machines, especially when the speed or the electrical loading are high and the slotting and winding configuration results in high magnitude asynchronous harmonics. Accurate estimation of these travelling flux harmonics in the initial design stage is essential, as small errors can result in significant errors in the estimated rotor losses, which could lead to misinformed design decisions. This Thesis makes a number of contributions to the subject of rotor losses in PM machines. It firstly investigates the

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46

Girardon, Hugo. "Shape reconstruction of deposits inside a steam generator using eddy current measurements." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX086.

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Le contrôle non destructif est un outil essentiel pour évaluer la sûreté des infrastructures dans les centrales nucléaires. En particulier, la présence de dépôts conducteurs dans les tubes en U des générateurs de vapeur constitue un enjeu de la sûreté en bloquant le circuit d'eau secondaire. Pour détecter ces dépôts, des sondes à courants de Foucault sont insérées dans les tubes en U pour générer des courants et mesurer en retour un signal d'impédance. Pour inverser ces mesures et reconstruire la forme du dépôt, nous développons une méthode d'optimisation de forme avec descente de gradient rég

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47

Sodano, Henry Angelo. "Development of Novel Eddy Current Dampers for the Suppression of Structural Vibrations." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27677.

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The optical power of satellites such as the Hubble telescope is directly related to the size of the primary mirror. However, due to the limited capacity of the shuttle bay, progress towards the development of more powerful satellites using traditional construction methods has come to a standstill. Therefore, to allow larger satellites to be launched into space significant interest has been shown in the development of ultra large inflatable structures that can be packaged inside the shuttle bay and then deployed once in space. To facilitate the packaging of the inflated device in its launch

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48

Adams, Leila. "Finite element method using vector finite elements applied to eddy current problems." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/9992.

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Vector fields found in electromagnetics are fundamentally different to vector fields found in other research areas such as structural mechanics. Electromagnetic vector fields possess different physical behaviour patterns and different properties in comparison to the other vector fields and therein lies the necessity of the development of a finite element which would be able to cater for these differences . The vector finite element was then developed and used within the finite element method specifically for the approximation of electromagnetic problems. This dissertation investigates the part

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Holmér, Sara. "Direct Sampling of the Pulsed Eddy Current Response From Non-Ferromagnetic Metals." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184944.

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The non-destructive testing method Pulsed Eddy Current, or PEC, can be used to measure the thickness and resistivity of conducting and non-ferromagnetic materials. In this project I investigated if a gauge at ABB, which uses PEC technology to measure the thickness of aluminium strips in rolling mills, can extract more information about the strip by sampling the direct signal with a higher resolution than before. Using the gauge with this new sampling method, I first compared the noise level of the integrated signal obtained by using analog and digital integration. Then I used an upper noise le

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50

Hughes, Robert Rhys. "High-sensitivity eddy-current testing technology for defect detection in aerospace superalloys." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/79695/.

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Industrial eddy-current testing (ECT) inspections of aerospace superalloys, such as Titanium 6Al-4V, must reliably detect sub-millimetre surface breaking defects. The sensitivity of such measurements is hindered by the materials' low conductivity and high coherent background material noise, making the high sensitivity standards required by industry harder to achieve. It is demonstrated herein that using eddy-current array (ECA) technology also introduces inspection "blind-spots", whereby small defects could be missed. This supports the motivation to develop techniques for enhancing the sensiti

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