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Дисертації з теми "Eddi current"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 липня 2025

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1

Nwaribe, Nicholas. "Active magnet bearings." Thesis, National aviation university, 2021. https://er.nau.edu.ua/handle/NAU/52781.

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1. Access mode: https://www.calnetix.com/resource/magnetic-bearings/advantages-magnetic-bearings 2. Access mode: https://www.waukbearing.com/resources/bearing-knowledge/how-active-magnetic-bearings-work.<br>A magnetic bearing is a form of bearing that uses magnetic levitation to support a load. Moving parts are supported by magnetic bearings without any physical contact. For example, they can levitate a spinning shaft and allow relative motion with very little friction and no mechanical wear. Magnetic bearings support the highest speeds of any kind of bearing and have no maximum relative spee

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2

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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3

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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4

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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5

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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6

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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7

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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8

Belloufi, Messaoud. "Experimental studies of eddy currents." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/12008.

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The thesis is mainly concerned with experimental studies of the heating effects of eddy currents. Sinusoidal and non-sinusoidal eddy current heating losses in non-magnetic conducting discs and spheres, subjected to a uniform field, are studied both theoretically and experimentally. The theory uses two different methods to calculate the power dissipation in the objects, and it employs Fourler series for the non-sinusoidal case. Some approximations for the losses at low frequency have been derived. The experimental study has three main sections. The first deals with the generation of uniform fie

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9

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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10

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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11

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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12

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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13

Giguere, Sylvain. "Pulsed eddy-currents for corrosion detection." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq44910.pdf.

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14

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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15

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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16

Case, Russell. "REDUCING EDDY CURRENTS IN HIGH MAGNETIC FIELD ENVIRONMENTS." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4305.

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When an electrical conducting volume is placed into the bore of an MRI undergoing an image scan, time varying magnetic gradients induce eddy currents in this conducting material. These eddy currents in turn produce a mechanical torque on this volume. It is the goal of this thesis to produce a computer simulation of eddy currents produced by placing conducting materials inside an MRI bore. The first part of the thesis establishes the physics and principles behind an MRI system along with several applications. Next, this thesis presents an analysis of eddy current effects produced on a conductor

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17

Ortiz, Gomez Natalia. "Eddy currents applied to space debris objects." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/415734/.

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The increasing population of space debris in the near-Earth region poses a serious threat to operational satellites in-orbit. This situation has led to the development of numerous guidelines in order to mitigate the potential danger of in-orbit collisions, fragmentations and uncontrolled re-entries. Among the various recommendations, active debris removal is considered as a possible solution to help decrease the chance of the aforementioned risks. However, active debris removal has never been done in space and it still requires further development of various technologies and orbit testing befo

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18

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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19

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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20

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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21

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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22

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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23

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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24

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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Анотація:

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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25

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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26

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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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

Benhama, Abdelkrim. "Investigation of losses in foil windings of inverter fed transformers operating at medium frequencies." Thesis, University of Salford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386448.

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29

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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30

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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Анотація:

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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31

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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32

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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33

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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34

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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35

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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36

Carstensen, Christian. "Eddy currents in windings of switched reluctance machines." Aachen Shaker, 2007. http://d-nb.info/989018482/04.

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37

Ati, Modafar K. "Calculation of electromagnetic field problems in large electrical machines using the finite element method." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238937.

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38

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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39

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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40

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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41

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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42

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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43

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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44

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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45

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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Анотація:

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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46

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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47

Oaten, Susan Rosemary. "Assessment of defects in ferromagnetic metals with eddy currents." Thesis, Brunel University, 1989. http://bura.brunel.ac.uk/handle/2438/5310.

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A study was made to identify and size surface breaking defects in ferromagnetic materials with eddy currents, whilst eliminating unwanted signals due to changes in magnetic permeability and probe lift-off. The former was overcome by the use of high frequencies and the latter by utilising the lift-off to characterise the defects. The lift- off or "touch" method was shown to be advantageous in that one could test steel objects having irregular surfaces, such as occurring with the presence of welds. In addition a theoretical investigation was undertaken to relate changes in the magnetic permeabil

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48

FORTALEZA, LEONARDO GOUVEA E. SILVA. "NON-FERROMAGNETIC METALLIC FOREIGN BODY DETECTION BY EDDY CURRENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=28358@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Projéteis de chumbo (não-ferromagnéticos) são corpos estranhos comuns na prática médica. Métodos convencionais de localização utilizam radiações ionizantes, impondo riscos à saúde e procedimentos que duram várias horas e tipicamente terminam malsucedidos. Mapas de campos magnéticos obtidos não-invasivamente e inocuamente com SQUIDs beneficiam a localização de agulhas metálicas ferromagnéticas, reduzindo o tempo de remoção bem-sucedida de 6 horas para 10 minutos. SQUIDs são os

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49

Remington, Alexander. "A Study of Non-Fluid Damped Skin Friction Measurements for Transonic Flight Applications." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/9789.

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A device was developed to directly measure skin friction on an external test plate in transonic flight conditions. The tests would take place on the FTF-II flight test plate mounted underneath a NASA F-15 aircraft flying at altitudes ranging from 15,000 to 45,000 ft. at Mach numbers ranging from 0.70 to 0.99. These conditions lead to predicted shear levels ranging from 0.3 to 1.5 psf. The gage consisted of a floating element cantilevered beam configuration that was mounted into the surface of the test plate in a manner non-intrusive to the flow it was measuring. Strain gages mounted at the bas

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50

Prabhakaran, Pradeep. "Development of electronic instrument for defect measurements with eddy currents /." St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17873.pdf.

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