Artykuły w czasopismach: „Eddy currents”

1

González, Manuel I. "Experiments with eddy currents: the eddy current brake". European Journal of Physics 25, nr 4 (22.04.2004): 463–68. http://dx.doi.org/10.1088/0143-0807/25/4/001.

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Hilborn, Robert C. "Eddy currents". Physics Teacher 52, nr 4 (kwiecień 2014): 197. http://dx.doi.org/10.1119/1.4868926.

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Xu, Zheng, Jiamin Wu, Lu Li, Yucheng He, Wei He i Dengjie Yu. "Fast analytical calculation method for eddy current induced by gradient fields in an MRI system". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, nr 6 (6.11.2017): 1690–705. http://dx.doi.org/10.1108/compel-12-2016-0566.

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Purpose Eddy currents are inevitable in magnetic resonance imaging (MRI) systems. These currents are mainly induced by gradient fields. This study aims to propose a fast analytical method to calculate eddy currents induced by frequently switching gradient fields in a traditional C-shape MRI system. Design/methodology/approach Fourier decomposition and magnetic vector potentials were used to calculate the eddy currents. Calculations with the proposed analytical method revealed the spatial distribution and temporal evolution of eddy currents. Findings Calculation and Maxwell simulation results were consistent. The agreement between calculation and simulation results indicates that increasingly sophisticated structures could be developed. The calculated results could guide the design of improved gradient coils. Originality/value Eddy currents induced by gradient current are decomposed into currents induced by each time-harmonic component, and then adding them together to obtain complete contribution of the eddy current. The analytical method was used to characterize the properties of symmetric and asymmetric eddy currents induced by gradient coils in MRI systems. The analytical method can be used to improve the gradient shield during the design of the gradient coil in the MRI system.

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Konrad, A. "Eddy currents and modelling". IEEE Transactions on Magnetics 21, nr 5 (wrzesień 1985): 1805–10. http://dx.doi.org/10.1109/tmag.1985.1063928.

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Iyer, R., J. Millhollon i K. Long. "Micromagnetics with eddy currents". Journal of Physics: Conference Series 268 (1.01.2011): 012011. http://dx.doi.org/10.1088/1742-6596/268/1/012011.

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Cessi, Paola, i Christopher L. Wolfe. "Adiabatic Eastern Boundary Currents". Journal of Physical Oceanography 43, nr 6 (1.06.2013): 1127–49. http://dx.doi.org/10.1175/jpo-d-12-0211.1.

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Abstract The dynamics of the eastern boundary current of a high-resolution, idealized model of oceanic circulation are analyzed and interpreted in terms of residual mean theory. In this framework, it is clear that the eastern boundary current is adiabatic and inviscid. Nevertheless, the time-averaged potential vorticity is not conserved along averaged streamlines because of the divergence of Eliassen–Palm fluxes, associated with buoyancy and momentum eddy fluxes. In particular, eddy fluxes of buoyancy completely cancel the mean downwelling or upwelling, so that there is no net diapycnal residual transport. The eddy momentum flux acts like a drag on the mean velocity, opposing the acceleration from the eddy buoyancy flux: in the potential vorticity budget this results in a balance between the divergences of eddy relative vorticity and buoyancy fluxes, which leads to a baroclinic eastern boundary current whose horizontal scale is the Rossby deformation radius and whose vertical extent depends on the eddy buoyancy transport, the Coriolis parameter, and the mean surface buoyancy distribution.

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Simm, A., i G. Y. Tian. "EDDY CURRENTS: Investigation of directional eddy current complex measurements for defect mapping". Insight - Non-Destructive Testing and Condition Monitoring 52, nr 6 (1.06.2010): 320–25. http://dx.doi.org/10.1784/insi.2010.52.6.320.

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Dziczkowski, Leszek, i Sławomir Zolkiewski. "Determination of the Penetration Depth of Eddy Currents in Defectoscopic Tests". Key Engineering Materials 588 (październik 2013): 64–73. http://dx.doi.org/10.4028/www.scientific.net/kem.588.64.

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In the defectoscopic tests by means of the eddy currents method only a certain superficial layer of the tested element is inspected. The reason of this phenomenon is connected with a very important feature of the eddy currents. The induced eddy currents generate its own magnetic field which obstructs penetration for the primary magnetic field. It is crucial to know the penetration depth of eddy currents. It allows planning successfully the diagnosis process. There are two cases worth mentioning: when the eddy current method is treated as the additional method complementary to the ultrasound method (because it does not detect superficial defects) and when the eddy current method is used as the main method for the thin elements diagnosis. The most frequently used evaluation method of eddy currents penetration depth is connected with determination of the e-folding decrease of electric current. The definition is convenient to use because it is simplified by using in the mathematical formula (allowing determination of the depth) frequency of eddy current and conductivity of the diagnosed elements. However the simplifications are not sufficient in practice. When we change the frequency of eddy currents during the survey or the probe then the depth of penetration is also changed, then we can measure the depth of the defects. While measuring the conductivity of a proper material element it is obligatory to prepare an adequate size of the sample that is free of defects. Knowing the value of penetration depth is then very helpful. On the other hand, when we have a sample of a specified size and we want to measure its conductivity then the knowledge of the depth of penetration of eddy currents helps us to select the proper frequency. In the paper there is described a proposal of a different definition of the penetration depth of eddy current, much more useful and accurate according to the authors. To obtain much more precise results, the new eddy current method was proposed. This method takes into account not only the parameters of the diagnosed sample and the eddy current frequency but the characteristic of the measuring device as well. The above mentioned method is based on the universal mathematical model of impact of conductive thin foil on the measuring coil impedance change. The procedure of calculations is easy to carry out online.

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9

Locci, N., i C. Muscas. "Hysteresis and eddy currents compensation in current transformers". IEEE Transactions on Power Delivery 16, nr 2 (kwiecień 2001): 154–59. http://dx.doi.org/10.1109/61.915475.

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Tsiapla, Aikaterini-Rafailia, Konstantinos Angelou i Mavroeidis Angelakeris. "Magnetically driven treatments: optimizing performance by mitigation of eddy currents". Nanomedicine 16, nr 11 (maj 2021): 895–907. http://dx.doi.org/10.2217/nnm-2020-0383.

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Aim: In this work, we study the eddy current evolution naturally occurring in magnetically driven treatments, such as MRI and magnetic particle hyperthermia (MPH), and propose the mitigation of eddy currents by careful control of field parameters. Materials & methods: We start by simulation of typical MRI and MPH experimental setups to witness eddy currents and then we examine experimentally how field parameters (frequency, amplitude and pulse duration) mitigate eddy currents in a typical MPH treatment. Results and conclusion: By tuning the frequency, the amplitude and by applying pulsed field mode, we successfully attenuate undesirable heating, due to eddy currents’ evolution, on surrounding healthy tissues without sparing beneficial effect within the malignant region, thus treatment remains reliable yet with milder side effects.

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Gorbatyy, Igor N., i Iana P. Zhura. "Eddy currents in multilayer coils". American Journal of Physics 89, nr 3 (marzec 2021): 284–90. http://dx.doi.org/10.1119/10.0002444.

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Penman, J. "Eddy currents and nondestructive testing". IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education) 137, nr 3 (maj 1990): 125. http://dx.doi.org/10.1049/ip-a-2.1990.0018.

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Mätzler, C. "Eddy Currents In Heterogeneous Mixtures". Journal of Electromagnetic Waves and Applications 2, nr 5-6 (styczeń 1988): 473–79. http://dx.doi.org/10.1163/156939388x00107.

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Rossing, Thomas D. "Eddy currents and magnetic friction". Physics Teacher 35, nr 3 (marzec 1997): 133. http://dx.doi.org/10.1119/1.2344619.

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Della Torre, E., i J. G. Eicke. "Eddy currents in micromagnetic calculations". IEEE Transactions on Magnetics 33, nr 2 (marzec 1997): 1251–54. http://dx.doi.org/10.1109/20.582481.

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Cunha, M. A. Q., A. H. Pereira, C. R. Schmidlin Junior i P. P. Reboucas Filho. "Eddy Currents Electromagnetic Brake Device". IEEE Latin America Transactions 14, nr 8 (sierpień 2016): 3643–47. http://dx.doi.org/10.1109/tla.2016.7786345.

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Pellicer-Porres, J., R. Lacomba-Perales, J. Ruiz-Fuertes, D. Martínez-García i M. V. Andrés. "Force characterization of eddy currents". American Journal of Physics 74, nr 4 (kwiecień 2006): 267–71. http://dx.doi.org/10.1119/1.2178848.

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Buret, François, Monique Dauge, Patrick Dular, Laurent Krahenbuhl, Victor Peron, Ronan Perrussel, Clair Poignard i Damien Voyer. "Eddy Currents and Corner Singularities". IEEE Transactions on Magnetics 48, nr 2 (luty 2012): 679–82. http://dx.doi.org/10.1109/tmag.2011.2175378.

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19

Kriezis, E. E., T. D. Tsiboukis, S. M. Panas i J. A. Tegopoulos. "Eddy currents: theory and applications". Proceedings of the IEEE 80, nr 10 (1992): 1559–89. http://dx.doi.org/10.1109/5.168666.

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Gros, X. E. "Technical Note: Detection of delamination in tyres using eddy currents". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 211, nr 1 (1.01.1997): 79–82. http://dx.doi.org/10.1243/0954407971526236.

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Non-destructive testing (NDT) is a useful tool to assess the structural integrity of components in order to maintain quality and safety standards. A low-cost electromagnetic technique based on eddy currents induced into a material appeared promising for the inspection of composite materials. Experiments were carried out in order to assess the potential of eddy currents in detecting delamination in rubber tyres. Infrared thermography was used to verify inspection results achieved with eddy currents. Non-destructive examination results are presented in this paper; these confirm that eddy current testing is an economically viable alternative for the inspection of steel reinforced truck tyres.

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Polański, Paweł, i Franciszek Szarkowski. "Simulations and Measurements of Eddy Current Magnetic Signatures". Zeszyty Naukowe Akademii Marynarki Wojennej 215, nr 4 (1.12.2018): 77–102. http://dx.doi.org/10.2478/sjpna-2018-0028.

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Abstract Eddy current magnetic signature is, together with magnetization of ferromagnetic hull, mechanisms and devices on board, corrosion related and stray field sources one of the main sources of ship’s magnetic signature. Due to roll, pitch and yaw of the ship in external magnetic field, eddy currents are induced in conducting materials on board ship, mainly in conducting hull. Flow of those currents is a source of magnetic field around a ship. Principal eddy current component is related to roll movement as it depends on rate of change of external field which is the highest for roll. Induced currents have both in-phase and quadrature components. Magnitude of the eddy current magnetic field can have significant effect on total magnetic field signature after degaussing for ships such as mine sweepers and mine hunters. Paper presents calculations and simulations as well as measurements of model and physical scale model made of low magnetic steel performed in Maritime Technology Center. Contribution of eddy current magnetic field in total field in low roll frequencies has been estimated.

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22

Mahariq, Ibrahim, Svetlana Beryozkina, Huda Mohammed i Hamza Kurt. "On the Eddy Current Losses in Metallic Towers". International Journal of Renewable Energy Development 9, nr 1 (9.01.2020): 1–6. http://dx.doi.org/10.14710/ijred.9.1.1-6.

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The existence of magnetic field around high-voltage overhead transmission lines or low-voltage distribution lines is a known fact and well-studied in the literature. However, the interaction of this magnetic field either with transmission or distribution towers has not been investigated. Noteworthy it is to remember that this field is time-varying with a frequency of 50 Hz or 60 Hz depending on the country. In this paper, we studied for the first time the eddy currents in towers which are made of metals. As the geometrical structures of towers are extremely complex to model, we provide a simple approach based on principles of electromagnetism in order to verify the existence of power loss in the form of eddy currents. The frequency-domain finite difference method is adapted in the current study for simulating the proposed model. The importance of such a study is the addition of a new type of power loss to the power network due to the fact that some towers are made of relatively conductive materials.©2020. CBIORE-IJRED. All rights reserved

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23

Anantha Krishna, G. L., i K. M. Sathish Kumar. "Investigation on Eddy Current Braking Systems – A Review". Applied Mechanics and Materials 592-594 (lipiec 2014): 1089–93. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1089.

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The changing magnetic field will induce eddy currents in the conductor. These currents will dissipate energy in the conductor and generate drag force. It is found that Aluminium is the best material as conductor compared to Copper and Zinc. Also, it is found that the larger thickness of disc, more number of turns of electromagnet and higher electrical conductivity of conductor influences the generation of greater braking torque. Conventional braking system relies on adhesion force between rail and wheel. It is found that a brake built up from permanent magnet pieces that combine both magnetic rail brake and eddy current brake permits the most profitable braking action through the whole range of acceptable speeds. Permanent magnet eddy current brake uses Neodymium - Iron - Boron (NdFeB) magnets. The analysis of permanent magnet eddy current shows that the parallel magnetised eddy current topology has the superior braking torque capability. In electrically controlled eddy current braking system subjected to time varying fields in different wave forms, the triangular wave field application resulted in highest braking torque. Electromagnetic brakes were found to interfere with the signalling and train control system. Permanent magnet eddy current brakes are a simple and reliable alternative to mechanical or electromagnetic brakes in transportation applications. Greater the speed greater is the eddy current braking efficiency. Hence, author intends to work on the development and investigation of permanent magnet eddy current braking system.

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Shiau, Jaw Kuen, Der Ming Ma i Min Jou. "Analysis and Experiments of Eddy Current Brakes with Moving Magnets". Materials Science Forum 575-578 (kwiecień 2008): 1299–304. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1299.

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This paper discusses the magnetic drag force resulting from the relative motion of a permanent magnet moving along a finite dimensional conducting plate. The image method with imaginary eddy currents is investigated. Boundary conditions are established to ensure that the eddy currents vanished at the boundaries of the conducting plate. Magnetic drag force is computed based on the eddy current distributions using Lorentz force law. A test system is built to demonstrate the magnetic brakes arose from the electromagnetic interactions.

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Zhang, Hong Jun, Xian Feng Du i Bao Li. "Study on the Eddy Current Loss Characteristic of the Coaxial Cylinder Style Magnetic Coupler". Applied Mechanics and Materials 151 (styczeń 2012): 41–46. http://dx.doi.org/10.4028/www.scientific.net/amm.151.41.

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This paper analyzed the eddy characteristics of the coaxial cylindrical magnetic coupler by using the finite element method, and simulated the impact of eddy currents on magnetic field. These effects mainly reflected in: weakening the magnetic coupling of the magnetic field intensity, and reducing the magnetic coupling torque. In addition, this paper calculated eddy current power loss, and proposed specific programs to reduce the eddy current power loss.

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Larionov, Vitalii V., Andrey M. Lider i Georgy V. Garanin. "Eddy Current Analysis for Nuclear Power Materials". Advanced Materials Research 1085 (luty 2015): 335–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1085.335.

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This paper presents experimental results of eddy current analysis of hydrogen in technically pure titanium alloy. Eddy currents when penetrating various depths change their parameters in relation to material properties. Each layer possesses different degree of hydrogenation and differs in number of defects and their location. The measurement of hydrogenated titanium conductivity in various depths with different angular position of eddy current probe were performed and discussed. Components` surface measurements caused by hydrogenation were registered by currents with the frequency of 10 MHz. The results can be used for the development of new materials with required properties.

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Sodano, Henry A., Jae-Sung Bae, Daniel J. Inman i W. Keith Belvin. "Improved Concept and Model of Eddy Current Damper". Journal of Vibration and Acoustics 128, nr 3 (3.11.2005): 294–302. http://dx.doi.org/10.1115/1.2172256.

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When a conductive material experiences a time-varying magnetic field, eddy currents are generated in the conductor. These eddy currents circulate such that they generate a magnetic field of their own, however the field generated is of opposite polarity, causing a repulsive force. The time-varying magnetic field needed to produce such currents can be induced either by movement of the conductor in the field or by changing the strength or position of the source of the magnetic field. In the case of a dynamic system the conductor is moving relative to the magnetic source, thus generating eddy currents that will dissipate into heat due to the resistivity of the conductor. This process of the generation and dissipation of eddy current causes the system to function as a viscous damper. In a previous study, the concept and theoretical model was developed for one eddy current damping system that was shown to be effective in the suppression of transverse beam vibrations. The mathematical model developed to predict the amount of damping induced on the structure was shown to be accurate when the magnet was far from the beam but was less accurate for the case that the gap between the magnet and beam was small. In the present study, an improved theoretical model of the previously developed system will be formulated using the image method, thus allowing the eddy current density to be more accurately computed. In addition to the development of an improved model, an improved concept of the eddy current damper configuration is developed, modeled, and tested. The new damper configuration adds significantly more damping to the structure than the previously implemented design and has the capability to critically damp the beam’s first bending mode. The eddy current damper is a noncontacting system, thus allowing it to be easily applied and able to add significant damping to the structure without changing dynamic response. Furthermore, the previous model and the improved model will be applied to the new damper design and the enhanced accuracy of this new theoretical model will be proven.

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Mukerji, Saurabh Kumar, Moleykutty George, M. B. Ramamurthy i Khandaker Asaduzzaman. "EDDY CURRENTS IN LAMINATED RECTANGULAR CORES". Progress In Electromagnetics Research 83 (2008): 435–45. http://dx.doi.org/10.2528/pier08062101.

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Mukerji, Saurabh Kumar, Moleykutty George, M. B. Ramamurthy i Khandaker Asaduzzaman. "EDDY CURRENTS IN SOLID RECTANGULAR CORES". Progress In Electromagnetics Research B 7 (2008): 117–31. http://dx.doi.org/10.2528/pierb08022801.

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Mook, Gerhard, Olaf Hesse i Valentin Uchanin. "Deep Penetrating Eddy Currents and Probes". Materials Testing 49, nr 5 (maj 2007): 258–64. http://dx.doi.org/10.3139/120.100810.

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Bottura, L., S. Chiocchio, A. Astapkovich i D. Williamson. "Eddy currents benchmark analysis in ITER". IEEE Transactions on Magnetics 28, nr 2 (marzec 1992): 1505–8. http://dx.doi.org/10.1109/20.123982.

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Walser, R. M., i A. P. Valanju. "Displacement eddy currents in magnetic laminates". IEEE Transactions on Magnetics 28, nr 5 (wrzesień 1992): 2280–82. http://dx.doi.org/10.1109/20.179469.

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French, Philip C. "Eddy currents in a rectangular toroid". IEE Proceedings A Physical Science, Measurement and Instrumentation, Management and Education, Reviews 134, nr 4 (1987): 309. http://dx.doi.org/10.1049/ip-a-1.1987.0041.

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Mallick, G. T., W. J. Carr, J. M. Toms i V. T. Kovachev. "Eddy currents in superconducting Rutherford cables". Cryogenics 35, nr 10 (styczeń 1995): 653–58. http://dx.doi.org/10.1016/s0011-2275(99)80006-x.

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Grössinger, R., M. Küpferling, P. Kasperkovitz, A. Wimmer, M. Taraba, W. Scholz, J. Dudding i in. "Eddy currents in pulsed field measurements". Journal of Magnetism and Magnetic Materials 242-245 (kwiecień 2002): 911–14. http://dx.doi.org/10.1016/s0304-8853(01)01324-5.

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Tietze, M. "Hot wire inspection using eddy currents". NDT & E International 24, nr 6 (grudzień 1991): 324. http://dx.doi.org/10.1016/0963-8695(91)90055-8.

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Bonvalot, Marceline, Pierre Courtois, Pascale Gillon i Robert Tournier. "Magnetic levitation stabilized by eddy currents". Journal of Magnetism and Magnetic Materials 151, nr 1-2 (listopad 1995): 283–89. http://dx.doi.org/10.1016/0304-8853(95)00313-4.

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Pan, W., W. Li, L. Y. Cui, X. M. Li i Z. H. Guo. "Rare earth magnets resisting eddy currents". IEEE Transactions on Magnetics 35, nr 5 (1999): 3343–45. http://dx.doi.org/10.1109/20.800519.

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Yanik, L., E. Della Torre, M. J. Donahue i E. Cardelli. "Micromagnetic eddy currents in conducting cylinders". Journal of Applied Physics 97, nr 10 (15.05.2005): 10E308. http://dx.doi.org/10.1063/1.1851872.

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Torres, L., L. Lopez-Diaz, E. Martinez i O. Alejos. "Micromagnetic dynamic computations including eddy currents". IEEE Transactions on Magnetics 39, nr 5 (wrzesień 2003): 2498–500. http://dx.doi.org/10.1109/tmag.2003.816452.

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Hantila, Florea I., Ioan R. Ciric, Augustin Moraru i Mihai Maricaru. "Modelling eddy currents in thin shields". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 28, nr 4 (10.07.2009): 964–73. http://dx.doi.org/10.1108/03321640910959035.

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Munday, David R., Helen L. Johnson i David P. Marshall. "Eddy Saturation of Equilibrated Circumpolar Currents". Journal of Physical Oceanography 43, nr 3 (1.03.2013): 507–32. http://dx.doi.org/10.1175/jpo-d-12-095.1.

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Abstract This study uses a sector configuration of an ocean general circulation model to examine the sensitivity of circumpolar transport and meridional overturning to changes in Southern Ocean wind stress and global diapycnal mixing. At eddy-permitting, and finer, resolution, the sensitivity of circumpolar transport to forcing magnitude is drastically reduced. At sufficiently high resolution, there is little or no sensitivity of circumpolar transport to wind stress, even in the limit of no wind. In contrast, the meridional overturning circulation continues to vary with Southern Ocean wind stress, but with reduced sensitivity in the limit of high wind stress. Both the circumpolar transport and meridional overturning continue to vary with diapycnal diffusivity at all model resolutions. The circumpolar transport becomes less sensitive to changes in diapycnal diffusivity at higher resolution, although sensitivity always remains. In contrast, the overturning circulation is more sensitive to change in diapycnal diffusivity when the resolution is high enough to permit mesoscale eddies.

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Mercier, D., D. Chicot, X. Decoopman i J. Lesage. "Eddy currents to control steel decarburising". Surface Engineering 23, nr 4 (lipiec 2007): 273–78. http://dx.doi.org/10.1179/174329407x215140.

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Baum, Eckhard, i Otto Erb. "Eddy currents and electrical surface charges". International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 16, nr 3 (2003): 199–218. http://dx.doi.org/10.1002/jnm.489.

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Sukhanov, D. Ya, i K. V. Zav’yalova. "Magnetic Field of Conductive Objects as Superposition of Elementary Eddy Currents and Eddy Current Tomography". Russian Physics Journal 60, nr 11 (marzec 2018): 1880–87. http://dx.doi.org/10.1007/s11182-018-1297-6.

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Ashcheulov, A. A., O. S. Verenko, M. Ya Derevianchuk i D. O. Lavreniuk. "THE INFLUENCE OF EDDY CURRENTS ON PARAMETERS OF ANISOTROPIC UNIPOLAR THERMOELEMENT". Sensor Electronics and Microsystem Technologies 20, nr 4 (27.12.2023): 45–52. http://dx.doi.org/10.18524/1815-7459.2023.4.294630.

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The purpose of this study is to evaluate the influence of eddy thermoelectric and electric currents and eddy heat flows with a laminar flow character on the value of transverse thermoEMF E⊥ and efficiency η of an anisotropic unipolar thermocouple. In the case of transverse thermoEMF of an anisotropic unipolar thermoelement, the assessment of such influence was carried out taking into account the eddy current caused by the anisotropy of the thermoEMF, and for the evaluation of the efficiency η – taking into account the eddy currents caused by the anisotropy of the coefficients of thermoEMF αi, electrical conductivity σik and thermal conductivity κik (i, k = 1..3). The research results showed that the influence of the studied current leads to a change in the value of the optimal angle of inclination γ between one of the selected crystallographic axes and the length a of the thermoelement and to some decrease in the value of the transverse thermoelectric power. Efficiency η under the action of eddy thermoelectric and electric currents and eddy heat flow is more significantly affected. Numerical analysis shows that in the case of using such a material as cadmium antimonide, the effect on the transverse thermoEMF is 36% (γ = 45⁰), and the effect on the efficiency is more significant.

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47

Drandić, Ana, Stjepan Frljić i Bojan Trkulja. "Methodology for Eddy Current Losses Calculation in Linear Variable Differential Transformers (LVDTs)". Sensors 23, nr 4 (4.02.2023): 1760. http://dx.doi.org/10.3390/s23041760.

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Linear variable differential transformer (LVDT) is a commonly used linear displacement sensor because of its good measurement characteristics. When using laminated ferromagnetic cores in LVDTs, it is very important to take eddy currents into the account during design phase of the sensor. Particularity of the open-type core means that the eddy currents induced by the stray magnetic flux that flow in large loops tangential to the lamination surfaces take on significant values. Due to the open-type core a typical LVDT has, depending on the core material, it is, therefore, very important to take eddy currents into the account when designing the sensor. This paper’s goal is to present a methodology for calculating LVDT eddy current losses that can be applied to LVDT design in order to optimize the dimensions and help with selection of materials of the LVDTs, in order to achieve the highest measurement accuracy. Presented approach using an AτA-formulation with elimination of redundant degrees of freedom exhibits rapid convergence. In order to calculate the relationship between eddy current losses and core displacement, frequency, and material characteristics, a number of 3D finite element method (FEM) simulations was performed. Analysis of the obtained results using presented methodology for eddy current losses calculation in LVDTs enables the designer optimize the design of the LVDT.

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Sullivan, Peter P., i James C. McWilliams. "Atmospheric Boundary Layers over an Oceanic Eddy". Journal of the Atmospheric Sciences 79, nr 10 (październik 2022): 2601–20. http://dx.doi.org/10.1175/jas-d-22-0019.1.

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Abstract Imagery and numerical modeling show an abundance of submesoscale oceanic eddies in the upper ocean. Large-eddy simulation (LES) is used to elucidate eddy impacts on the atmospheric boundary layer (ABL) forced by winds, convection, and an eddy with varying radius; the maximum azimuthal eddy speed is 1 m s−1. Simulations span the unstable regime −1/L = [0, ∞], where L is the Monin–Obukhov (M–O) stability parameter. A linearized Ekman model and the LES couple ABL winds to an eddy through rough-wall M–O boundary conditions. The eddy currents cause a surface stress anomaly that induces Ekman pumping in a dipole horizontal pattern. The dipole is understood as a consequence of surface winds aligned or opposing surface currents. In free convection a vigorous updraft is found above the eddy center and persists over the ABL depth. Heterogeneity in surface temperature flux is responsible for the full ABL impact. With winds and convection, current stress coupling generates a dipole in surface temperature flux even with constant sea surface temperature. Wind, pressure, and temperature anomalies are sensitive to an eddy under light winds. The eddy impact on ABL secondary circulations is on the order of the convective velocity scale but grows with increasing current speed, decreasing wind, or increasing convection. Flow past an isolated eddy develops a coherent ABL “wake” and secondary circulations for at least five eddy radii downwind. Kinetic energy exchanges by wind work indicate an eddy-killing effect on the oceanic eddy current, but only a spatial rearrangement of the atmospheric wind work.

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Romero-Arismendi, Nestor O., Juan C. Olivares-Galvan, Jose L. Hernandez-Avila, Rafael Escarela-Perez, Victor M. Jimenez-Mondragon i Felipe Gonzalez-Montañez. "Past, Present, and Future of New Applications in Utilization of Eddy Currents". Technologies 12, nr 4 (9.04.2024): 50. http://dx.doi.org/10.3390/technologies12040050.

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Eddy currents are an electromagnetic phenomenon that represent an inexhaustible source of inspiration for technological innovations in the 21st century. Throughout history, these currents have been a subject of research and technological development in multiple fields. This article delves into the fascinating world of eddy currents, revealing their physical foundations and highlighting their impact on a wide range of applications, ranging from non-destructive evaluation of materials to levitation phenomena, as well as their influence on fields as diverse as medicine, the automotive industry, and aerospace. The nature of eddy currents has stimulated the imaginations of scientists and engineers, driving the creation of revolutionary technologies that are transforming our society. As we progress through this article, we will cover the main aspects of eddy currents, their practical applications, and challenges for future works.

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Matsuoka, Daisuke, Fumiaki Araki i Hideharu Sasaki. "Event detection and visualization of ocean eddies simulated by ocean general circulation model". International Journal of Modeling, Simulation, and Scientific Computing 10, nr 03 (czerwiec 2019): 1950018. http://dx.doi.org/10.1142/s1793962319500181.

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Numerical study of ocean eddies has been carried out by using high-resolution ocean general circulation models. In order to understand ocean eddies from the large volume data produced by simulations, visualizing only eddy distribution at each time step is insufficient; time-variations in eddy events and phenomena must also be considered. However, existing methods cannot precisely find and track eddy events such as amalgamation and bifurcation. In this study, we propose an original approach for eddy detection, tracking, and event visualization based on an eddy classification system. The proposed method detects streams and currents as well as eddies, and it classifies discovered eddies into several categories using the additional stream and current information. By tracking how the classified eddies vary over time, detecting events such as eddy amalgamation and bifurcation as well as the interaction between eddies and ocean currents becomes achievable. We adopt the proposed method for two ocean areas in which strong ocean currents exist as case studies. We visualize the detected eddies and events in a time series of images, allowing us to acquire an intuitive understanding of a region of interest concealed in a high-resolution data set. Furthermore, our proposed method succeeded in clarifying the occurrence place and seasonality of each type of eddy event.

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