Log in

Relevant bibliographies by topics / Eddi current / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Eddi current.

Dissertations / Theses on the topic 'Eddi current'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Eddi current.'

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

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

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

1

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

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

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

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

4

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

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

5

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

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

[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

APA, Harvard, Vancouver, ISO, and other styles

8

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

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

9

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

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

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

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

17

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

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

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

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

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

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

21

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

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

24

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

Find full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

36

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

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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