Academic literature on the topic 'Vector magnetization characteristics'
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Journal articles on the topic "Vector magnetization characteristics"
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Xiao, Xiao, Fabian Müller, Martin Marco Nell, and Kay Hameyer. "Modeling anisotropic magnetic hysteresis properties with vector stop model by using finite element method." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 41, no. 2 (2021): 752–63. http://dx.doi.org/10.1108/compel-06-2021-0213.
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Purpose This paper aims to use a history-dependent vector stop hysteresis model incorporated into a two dimensional finite elements (FE) simulation environment to solve the magnetic field problems in electrical machines. The vector stop hysteresis model is valid for representing the anisotropic magnetization characteristics of electrical steel sheets. Comparisons of the simulated results with measurements show that the model is well appropriate for the simulation of electrical machines with alternating, rotating and harmonic magnetic flux densities. Design/methodology/approach The anisotropy of the permeability of an electrical steel sheet can be represented by integrating anhysteretic surfaces into the elastic element of a vector hysteresis stop model. The parameters of the vector stop hysteresis model were identified by minimizing the errors between the simulated results and measurements. In this paper, a damped Newton method is applied to solve the nonlinear problem, which ensures a robust convergence of the finite elements simulation with vector stop hysteresis model. Findings Analyzing the measurements of the electrical steel sheets sample obtained from a rotational single sheet tester shows the importance to consider the anisotropic and saturation behavior of the material. Comparing the calculated and measured data corroborates the hypothesis that the presented energy-based vector stop hysteresis model is able to represent these magnetic properties appropriately. To ensure a unique way of hysteresis loops during finite elements simulation, the memory of the vector stop hysteresis model from last time step is kept unchanged during the Newton iterations. Originality/value The results of this work demonstrates that the presented vector hysteresis stop model allows simulation of vector hysteresis effects of electrical steel sheets in electrical machines with a limited amount of measurements. The essential properties of the electrical steel sheets, such as phase shifts, the anisotropy of magnetizations and the magnetization characteristics by alternating, rotating, harmonic magnetization types, can be accurately represented.
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S., T. Tolmachev, and V. Il'chenko A. "THE RECIPROCITY PRINCIPLE FOR A NONLINEAR ANISOTROPIC MEDIUM WITHOUT HYSTERESIS: THEORY AND PRACTICE OF APPLICATION." Electrical engineering & electromechanics, no. 2 (April 16, 2020): 40–45. https://doi.org/10.20998/2074-272X.2020.2.06.
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<em>The construction of the correct vector material equations for nonlinear anisotropic soft magnetic materials remains one of the main reserves for increasing the accuracy of mathematical models in solving magnetostatic problems in the field formulation. The aim of the work is to establish asymptotic expressions for the reciprocity principle, which is a fundamental property of reversible magnetization processes of nonlinear anisotropic media, and to use the obtained results to optimize the computational process when constructing the vector magnetization characteristic and differential permeability tensor. The potentiality property of the magnetic flux density vector <strong>B</strong> in <strong>H</strong>-space is used. The main result of the paper is an illustration, using concrete examples, of an alternative method for calculating vector magnetization characteristics for one of the orthogonal families. In order to eliminate the instrumental error and ensure maximum accuracy and reliability of the obtained results, the exact characteristics for the components of the vector magnetization characteristic obtained by differentiating a special analytical expression for the potential were used as initial ones. The principle of reciprocity, by virtue of its universal nature, makes a significant contribution to the theory of nonlinear anisotropic media in the hysteresis-free approximation. Asymptotic expressions for the reciprocity principle are obtained for the first time. The performed computational experiments on the construction of vector characteristics based on the known magnetization characteristics in one of the directions confirm almost complete coincidence with the exact values obtained analytically. The use of asymptotic expressions for the reciprocity principle not only greatly simplifies computational processes for determining the orthogonal magnetization characteristics, but also implements the calculation of differential permeability tensors for arbitrary field values. The proposed method can be implemented in applications for calculating the magnetic field in devices with nonlinear anisotropic magnetically soft materials, primarily with cold rolled sheet electrical steels, which are most used in electrical engineering.</em>
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Юсипова, Ю. А. "Частота и быстродействие спинового вентиля с планарной анизотропией слоев". Физика твердого тела 62, № 9 (2020): 1361. http://dx.doi.org/10.21883/ftt.2020.09.49754.29h.
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The dynamics of the magnetization vector in the free layer of a layered spin-valve structure was simulated. As materials for the free and fixed layers, six magnetically soft ferromagnets with longitudinal anisotropy were considered. The types of magnetization dynamics that are of practical interest for MRAM and HMDD (switching of the magnetization vector), STNO (stable precession of the magnetization vector), and the base element PSL (switching of the magnetization vector with two probable outcomes) were highlighted. The ranges of currents and fields corresponding to these operating modes of the spin valve were calculated. The numerical calculations of the switching time showed that, among the considered materials for the MRAM cell, the most suitable is Co80Gd20 alloy, while for the HMDD read head, it is Fe60Co20B20. As a result of the precession frequency calculations, it was concluded that the Fe60Co20B20 alloy is optimal for the STNO ferromagnetic layers. For the implementation of PSL, the best switching characteristics were demonstrated by the Co93Gd7 alloy.
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Ma, Guoqing, Lingwei Meng, and Lili Li. "Fast Magnetization Vector Inversion Method with Undulating Observation Surface in Spherical Coordinate for Revealing Lunar Weak Magnetic Anomaly Feature." Remote Sensing 16, no. 2 (2024): 432. http://dx.doi.org/10.3390/rs16020432.
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The three-dimensional magnetic vector structure (magnetization intensity and direction) of the planet can be effectively used to analyze the characteristics of its formation and operation. However, the quick acquisition of a large region of the magnetic vector structure of the planet with bigger observation surfaces undulation is hard and indispensable. We firstly proposed a fast magnetization vector inversion method for the inversion of a magnetic anomaly with the undulating observation surfaces in the spherical coordinate system, which first transforms the data to a plane when the data are distributed on a surface. Then, it uses a block-Toeplitz-Toeplitz-block (BTTB)-FFT to achieve fast inversion with the constraint that the magnetization intensities of the grids between the transformed observation surfaces and the terrain are zero. In addition, Gramian constraint term is used to reduce the ambiguity of the magnetic vector inversion. The theoretical model tests show that the proposed method can effectively improve the computational efficiency by 23 times in the 60 × 60 × 10 grid division compared to the conventional inversion method, and the accuracy of the two computation methods is comparable. The root-mean-square error of the magnetization intensity is only 0.017, and the angle error is within 1°. The magnetization vector structure shows that the largest crater diameter does not exceed 340 km in the Mare Australe region, the amplitude of the magnetic anomaly is much higher than the current meteorite impact simulation results, and the depth of the magnetic source is less than 10 km, which cannot be explained by the impact simulation experiments. In addition, the magnetization directions of adjacent sources differ by 122° (or 238°), and the high-frequency dynamics of the Moon as well as the short-lived dynamics may be responsible for this phenomenon. The magnetization directions of the three adjacent sources in the Mare Crisium region are close to each other and differ in depth with different cooling times, making it difficult to record the transient fields produced by meteorite impacts. In addition to the above characteristics, the magnetization direction of the magnetic sources in both regions is uniformly distributed without reflecting the dispersion of the magnetization direction of the meteorite impact magnetic field. Therefore, it can be inferred that the magnetic anomalies in these two regions are related to the generator hypothesis.
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Guskov, Vladimir Olegovich, Aleksandr Vasil'evich Saushev, Veniamin Francevich Samoseiko, and Andrey Viktorovich Lavin. "Maximizing the torque of an asynchronous motor taking into account losses power when limited by the energy converter." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2024, no. 3 (2024): 91–97. http://dx.doi.org/10.24143/2073-1574-2024-3-91-97.
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The issues of optimal control of an asynchronous motor according to the criterion of the maximum of its electromagnetic torque are considered. It is shown that electric energy converters feeding the windings of electric machines have semiconductor switches in their composition, the characteristics of which are subject to known limitations. One of these characteristics for a semiconductor key is the value of the maximum current that it can pass through itself for a long time without breaking down. The electromagnetic torque of an asynchronous electric motor with vector control is proportional to two orthogonal currents with respect to each other - magnetization and load. The magnetization current determines the magnetization of the magnetic circuit, it has a significant effect on the operating modes of the machine. The geometric sum of these currents, called the stator current modulus, forms a current that flows through the converter switches. Each of these currents has its own control circuit. The control system limits the modulus of the stator current vector at a given level. There presented the formulas for finding optimal tasks for the circuits of the above-mentioned ones, which allow to obtain the maximum electromagnetic moment under given restrictions on the modulus of the vector of the stator from the side of the electric energy converter. It is established that in order to obtain the maximum electromagnetic torque of an asynchronous motor, it is necessary to take into account the nonlinearity of its magnetization. The paper calculates the maximum electromagnetic torque for various functions approximating the magnetization curve of the magnetic circuit of an asynchronous motor, and also performs an approximate calculation of power losses. It is proved that maximizing the electromagnetic torque makes it possible to significantly expand the mechanical characteristics of the motor and electric drive.
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Leidhold, R., D. Kaluhin, and O. Tolochko. "EXPERIMENTAL RESEARCH OF THE MAGNETIZATION AND DEMAGNETIZATION PROCESSES OF THE VECTOR-CONTROLLED INDUCTION MOTOR." Tekhnichna Elektrodynamika 2024, no. 6 (2024): 44–49. http://dx.doi.org/10.15407/techned2024.06.044.
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Experimental research of the processes of magnetization and demagnetization for the motionless vector-controlled induction motor was performed, according to a linear law with a variation in the duration of these processes. The methodology of research during which the orthogonal components of the stator and rotor currents were recorded in the rotor flux reference frame, the rotor flux module and the energy of the total losses in the stator and rotor copper is described. The main characteristics and parameters of laboratory equipment and facilities are given. From the point of view of minimizing copper losses, the existence of the optimal duration of the investigated transient processes has been experimentally proven. The results of experimental studies with high accuracy coincide with calculations based on previously obtained analytical dependencies, which confirms the admissibility of the assumptions made during theoretical studies. References 10, figures 7, tables 2.
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Shi, Minxia, Teng Li, Shuai Yuan, Leran Zhang, Yuzheng Ma, and Yi Gao. "Iron Loss and Temperature Rise Analysis of a Transformer Core Considering Vector Magnetic Hysteresis Characteristics under Direct Current Bias." Materials 17, no. 15 (2024): 3767. http://dx.doi.org/10.3390/ma17153767.
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Direct current (DC) bias induced by the DC transmission and geomagnetically induced current is a critical factor in the abnormal operation of electrical equipment and is widely used in the field of power transmission and distribution system state evaluation. As the main affected component, the vector magnetization state of a transformer core under DC bias has rarely been studied, resulting in inaccurate transformer operation state estimations. In this paper, a dynamic vector hysteresis model that considers the impact of rotating and DC-biased fields is introduced into the numerical analysis to simulate the distribution of magnetic properties, iron loss and temperature of the transformer core model and a physical 110 kV single-phase autotransformer core. The maximum values of B, H and iron loss exist at the corners and T-joint of the core under rotating and DC-biased fields. The corresponding maximum value of the temperature increase is found in the main core limb area. The temperature rise of the 110 kV transformer core under various DC-biased conditions is measured and compared with the FEM (Finite Element Method) results of the proposed model and the model solely based on the magnetization curve B||H. The calculation error of the temperature rise obtained by the improved model is approximately 3.76–15.73% and is much less than the model solely based on magnetization curve B||H (approximately 50.71–66.92%).
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Wakabayashi, Daisuke, Takashi Todaka, and Masato Enokizono. "Measurement of Three-Dimensional Magnetostriction on Grain-Oriented Electrical Steel Sheet." Journal of Electrical Engineering 62, no. 3 (2011): 153–57. http://dx.doi.org/10.2478/v10187-011-0025-z.
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Measurement of Three-Dimensional Magnetostriction on Grain-Oriented Electrical Steel Sheet This paper deals with the magnetostriction of a grain-oriented electrical steel sheet measured by using the two-dimensional vector magnetic property measurement system and a three-axial strain gage. The magnetostrictions in arbitrary direction are calculated with the measured strain tensors. The magnetostriction characteristics were changed depending on the magnetization process according to the exciting magnetic flux density and the exciting direction. In this paper, we make clear the relationship among the two-dimensional magnetostriction, the magnetic flux density vector, and the magnetic field intensity vector in the grain-oriented electrical steel sheet.
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Ishikawa, Takeo, and Naoto Igarashi. "Failure Diagnosis of Demagnetization in Interior Permanent Magnet Synchronous Motors Using Vibration Characteristics." Applied Sciences 9, no. 15 (2019): 3111. http://dx.doi.org/10.3390/app9153111.
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The detection of a precursor to the demagnetization of permanent magnets is very important because a high degree of reliability is necessary in permanent magnet synchronous motors (PMSMs). This paper investigated the diagnosis of very slight PM demagnetization. A part of the permanent magnet was altered to non-magnetic material so as to mimic the effect of demagnetization. The vibration characteristics were clarified for low demagnetization in PMSMs driven under vector control by experiments and 3D finite element (FE) analysis. We found that the amplitude of some components of the vibration was approximately proportional to the demagnetization level of the PM and the load torque. Therefore, the measurement of vibration and torque is very useful for the estimation of the magnetization level of PMSMs under vector control except for under very light load.
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Rezayee, Mohammad Hakim, Ahamd Qasim Akbar, Torabaz Poyesh, Ezatullah Rawnaq, Khair Mohammad Samim, and Hideki Mizunaga. "3D Geophysical Modeling Based on Multi-Scale Edge Detection, Magnetic Susceptibility Inversion, and Magnetization Vector Inversion in Panjshir, Afghanistan to Detect Probabilistic Fe-Polymetallic Bearing Zone." Geosciences 13, no. 12 (2023): 376. http://dx.doi.org/10.3390/geosciences13120376.
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The Panjshir Fe-Polymetallic ore deposit is a valuable geological resource in Afghanistan, rich in iron and multiple essential metallic minerals, with substantial potential for industrial development. The exploration phase faces challenges related to the complex geological settings, high variability of mineral compositions, and the need for advanced geophysical techniques to accurately locate and assess valuable metallic resources. Considering the strong magnetic characteristics exhibited by Fe-Polymetallic elements, geomagnetic data were employed to analyze and map the likely prospectivity of Fe-Polymetallic deposits within the study area. Multi-scale edge detection techniques were employed to accurately map the boundaries of magnetic bodies by utilizing the upward continued analytical signal amplitude. The presence of a fault system on the geological map confirmed the structural information derived from our edge detection techniques. Advanced magnetic data inversion techniques were employed to create a three-dimensional representation of the distribution of magnetic bodies linked to Fe-Polymetallic deposits. In our efforts to reduce the impact of remnant magnetization in the study area, we adopted a comprehensive strategy by employing both magnetic susceptibility and magnetization vector inversion techniques. The use of a sparse and blocky norm regularization [0,1,1,1] is well-suited for magnetic susceptibility inversion, while a blocky norm [0000,0000,0000] is the appropriate choice for magnetization vector inversion in our study. Ultimately, the zones characterized by a high magnetic susceptibility and a high magnetization amplitude are considered promising areas for potential Fe-polymetallic occurrences.
Dissertations / Theses on the topic "Vector magnetization characteristics"
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Мохсен, Аббасиан. "Коаксиально-линейный двигатель с постоянными магнитами в вибрационной системе погружателя строительных элементов". Thesis, Киевский национальный университет строительства и архитектуры, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21242.
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Диссертация на соискание учёной степени кандидата технических наук по специальности 05.09.01 – электрические машины и аппараты. – Национальный технический университет Украины "Харьковский политехнический институт" Харьков, 2016.
Диссертация посвящена вопросам разработки и исследованию особенностей электромагнитных и электромеханических процессов коаксиально-линейных двигателей с аксиальным и радиальным вектором намагничивания постоянных магнитов для привода рабочего органа погружателя. Рассмотрены конструкции коаксиально-линейных двигателей с постоянными магнитами для привода рабочего органа погружателя строительных элементов и разработана математическая модель, а также методы расчета магнитной индукции, электромеханических и частотных характеристик при статическом и динамическом режимах работы вибрационного оборудования на основе коаксиально-линейных двигателей с аксиальным и радиальным вектором намагничивания постоянных магнитов. Предложена модель коаксиально-линейного двигателя с постоянными магнитами с аксиальным и радиальным вектором намагничивания постоянных магнитов в виде электрической схемы замещения и проведён сравнительный анализ векторных диаграмм напряжений и токов, позволяющий характеризовать энергетические параметры и рабочие характеристики при различных частотах напряжения. Разработан и изготовлен экспериментальный стенд для исследования статических и динамических характеристик коаксиально-линейных двигателей с постоянными магнитами. Проведённый анализ электромеханических характеристик коаксиально-линейных двигателей с постоянными магнитами показал, что при одинаковых параметрах жёсткости тяговых и ход-амперных характеристик более эффективным является двигатель с радиальным вектором намагничивания постоянных магнитов. На основе проведенных исследований коаксиально-линейных двигателей с аксиальным и радиальным вектором намагничивания постоянных магнитов с одинаковыми конструктивными параметрами статора и равными по массе магнитами и сравнение их электромагнитных, электромеханических и частотных характеристик, полученных при статическом и динамическом режимах работы двигателей, установлена целесообразность использования коаксиально-линейных двигателей с радиальным вектором намагничивания постоянных магнитов для привода рабочего органа погружателя строительных элементов.<br>The thesis for competition of the academic degree of candidate of technical sciences on the speciality 05.09.01 - electrical machines and apparatus. - The National Technical University "Kharkiv Polytechnic Institute" (NTU "KhPI"), Kharkiv, 2016.
The thesis is devoted to the issues of development and study of the characteristics of magnetic and electromechanical processes in the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of immertor. The construction of coaxial linear motors with permanent magnets for drive of the working body of the immertor of building, models and methods of calculating the values of the parameters of electromagnetic induction, electromechanical and frequency characteristics under static and dynamic modes of vibration equipment with axial and radial magnetization vector of permanent magnets are researched. The experimental stand for removal of static and dynamic characteristics of coaxial linear motors with permanent magnets is developed and manufactured. The analysis of the effectiveness of using the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of the immertor of building elements with the same design parameters of stator and magnets equal in weight during the process of creating drives of vibrators based on comparison, obtained by static and dynamic modes.
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Мохсен, Аббасіан. "Коаксіально-лінійний двигун з постійними магнітами у вібраційній системі занурювача будівельних елементів". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21228.
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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.09.01 – електричні машини й апарати. – Національний технічний університет України "Харківський політехнічний інститут", Харків, 2016.
Дисертаційна робота присвячена питанням розробки та дослідження особливостей електромагнітних та електромеханічних процесів коаксіально-лінійних двигунів з аксіальним та радіальним вектором намагнічування постійних магнітів для привода робочого органу занурювача. Запропоновані конструкції коаксіально-лінійних двигунів з постійними магнітами для привода робочого органу занурювача будівельних елементів, а також методи розрахунку магнітної індукції, електромеханічних та частотних характеристик при статичному та динамічному режимах роботи вібраційного обладнання на основі коаксіально-лінійних двигунів з постійними магнітами. Розроблені та виготовлені експериментальні стенди для дослідження статичних та динамічних характеристик коаксіально-лінійних двигунів з постійними магнітами. На основі проведеного дослідження коаксіально-лінійних двигунів з аксіальним та радіальним вектором намагнічування постійних магнітів з однаковими конструктивними параметрами статора та рівними за масою магнітами та порівняння їх характеристик, отриманих при статичному та динамічному режимах роботи двигунів, встановлено доцільність використання коаксіально-лінійних двигунів з радіальним вектором намагнічування постійних магнітів для привода робочого органу занурювача будівельних елементів.<br>The thesis for competition of the academic degree of candidate of technical
sciences on the speciality 05.09.01 - electrical machines and apparatus. - The National Technical University "Kharkiv Polytechnic Institute" (NTU "KhPI"), Kharkiv, 2016.
The thesis is devoted to the issues of development and study of the characteristics of magnetic and electromechanical processes in the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of immertor. The construction of coaxial linear motors with permanent magnets for drive of the working body of the immertor of building, models and methods of calculating the values of the parameters of electromagnetic induction, electromechanical and frequency characteristics under static and dynamic modes of vibration equipment with axial and radial magnetization vector of permanent magnets are researched. The experimental stand for removal of static and dynamic characteristics of coaxial linear motors with permanent magnets is developed and manufactured. The analysis of the effectiveness of using the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of the immertor of building elements with the same design parameters of stator and magnets equal in weight during the process of creating drives of vibrators based on comparison, obtained by static and dynamic modes.
Book chapters on the topic "Vector magnetization characteristics"
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Kuroda, Jumpei, Kaito Kimura, Ryutaro Ono, et al. "Study on Linear Actuators for Intake and Exhaust Systems of Internal Combustion Engines (Analytical Consideration of Thrust Characteristics by Permanent Magnet Array)." In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-70392-8_3.
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AbstractTo enhance internal combustion engine performance, this study focuses on developing an electric valve drive system utilizing linear actuators for intake and exhaust valve control. The linear actuator, comprising a movable coil and a fixed permanent magnet, operates based on the principle of the Lorentz force. Unlike traditional magnetic circuits, this actuator employs five permanent magnets with different magnetization directions to concentrate the flux on the coil. In this study, multiple models with varying ratios of these permanent magnets were created and analyzed using finite element analysis conducted with the JMAG software to investigate the thrust characteristics during the reciprocating motion of the actuator. The vector plot of the magnetic flux density shows that the magnetic circuit is predominantly composed of permanent magnets. The average thrust at a 10 mm displacement was approximately 107 N in the largest model. Future studies will aim to design actuators with increased thrust capabilities.
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Freeman, R. "Spin choreography." In Pulsed Magnetic Resonance: NMR, ESR, and Optics. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198539629.003.0010.
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Abstract Very soon after the initial discovery of nuclear magnetic resonance, E. L. Hahn performed an experiment that, in conceptual originality and elegance, transcended all that had preceded it-the spin echo experiment [1]. Here was an idea to inspire the young scientists reading about NMR for the first time. Not only could oneworkwith these strange new entities called spins, but alsomanipulatethem like a conjuror with a pack of cards. In its original form, experiment was conceptually easier to follow, resembling the opening and closing of a ‘fan’ of vectors confined to the transverse(x-y)plane of the rotating frame. Note that the description of the conventional continuous wave NMR experiments of the time scarcely required this level of sophistication, relying on the steady state solutions of the Bloch equations. To understand spin echoes, one was forced to come to grips with homogeneous and inhomogeneous line broadening, transformation into the rotating frame of reference, and the concept of ‘spin isochromats’. This was a term coined by Abragam [3]. The sample is considered to be made up of a mosaic of volume elements, each small enough that the variation of the applied field intensity across that element could be neglected, but with neighbouring elements in slightly different applied fields due to the spatial inhomogeneity. Each element has a nuclear magnetization with a characteristic precession frequency; this is an isochromat. The total sample magnetization is the resultant of all these isochromatic magnetization vectors. Because the isochromats have different intrinsic frequencies this resultant can change as individual isochromats fan out or come back into alignment. This has proved a valuable idea for describing spin echo experiments.
Conference papers on the topic "Vector magnetization characteristics"
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Priputnev, P., I. Romanchenko, S. Maltsev, and R. Sobyanin. "Influence of voltage pulse polarity on excitation of high-frequency oscillations in a nonlinear transmission line with saturated ferrite." In 8th International Congress on Energy Fluxes and Radiation Effects. Crossref, 2022. http://dx.doi.org/10.56761/efre2022.s3-p-921201.
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Experimentally and using numerical simulation the process of excitation of high-frequency oscillations in a nonlinear transmission line with saturated ferrite, depending on the polarity of the incident voltage pulse, was studied. As part of the work, an effect was discovered in which the voltage pulses generated at the output of the transmission line depend on the direction of rotation of the magnetization vector of the ferrite filling. The shape and characteristics of these pulses were studied and compared depending on the polarity of the incident voltage pulse.
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Bukhanko, A., and A. Sukstanskii. "Optics of a ferromagnetic superlattice: Dependence optical characteristics on the angle between the magnetization vectors, wave nonreciprocity." In 2008 International Conference on Mathematical Methods in Electromagnetic Theory (MEET). IEEE, 2008. http://dx.doi.org/10.1109/mmet.2008.4581035.
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Wei, Haotian, Shaohua Dong, Yundong Ma, Lushuai Xu, Jiahao Zhao, and Hang Zhang. "Simulation Analysis and Experimental Study on Pipeline Circumferential Crack Detection Based on Residual Magnetism Effect." In ASME 2023 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/pvp2023-105782.
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Abstract A method for crack detection on the surface of pipelines that uses residual magnetic detection technology based on the hysteresis effect after magnetizing the pipeline to magnetic saturation has been developed in this study. Support vector regression (SVR) was employed for quantitative assessment. This paper reviewed the magnetization process of the magnetizer, the generation of residual magnetism effect, and the detection of residual magnetic fields. An experimental and theoretical study examined how the crack size affects residual magnetic anomalies. The simulation results indicated that the characteristic values of the residual magnetic anomaly changed in a roughly linear fashion at a more significant crack depth. As the crack width increased, the variations in residual magnetic anomaly characteristic quantities were relatively mild. The input values were denoted by the extracted characteristic amounts. The width and depth parameters of the crack were used as output values. A trained SVR model was employed to estimate the crack size. The crack widths and depths were accurately determined at 62.5% and 85.42%, respectively by combining this detection method, SVR, and the experimental results. This study demonstrated the feasibility of using residual magnetic detection technology, combined with SVR, to detect circumferential cracks in pipelines, which is an essential supplement to internal magnetic flux leakage detection and assessing pipelines.
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КОНСТАНТИНОВ К, М., Д. ТОМШИН М та С. ХОРОШИХ М. "ПЕТРОФИЗИЧЕСКИЕ ОРЕОЛЫ СТРУКТУР ДИАТРЕМОВОЙ АССОЦИАЦИИ". У ГЕОЛОГИЯ И МИНЕРАЛЬНО-СЫРЬЕВЫЕ РЕСУРСЫ СЕВЕРО-ВОСТОКА РОССИИ 2024. Crossref, 2024. http://dx.doi.org/10.53954/9785604990100_128.
Full textAbstract:
Petro- and paleomagnetic studies of Early Paleozoic rocks of carbonate basement of a number of diamond deposits in the Yakutsk diamondiferous province were carried out to study changes in the values of petrophysical parameters in the zone of dynamic influence of a kimberlite pipe. It is shown that during the formation of kimberlite diatrems accompanied by pulsational, upward-shifting explosions, thermoelastic stress fields characterized by epigenetic changes and related petrophysical aureoles appear in the kimberlite-bearing medium. Naturally, some of these petrophysical aureoles are petromagnetic heterogeneities of burning and stress, within which kimberlite-bearing rocks have contrastingly changed their original magnetic characteristics under the action of thermodynamic processes. Generally, petromagnetic aureoles are reflected in the changing nature of anisotropy magnetic susceptibility: from sedimentary to dyke geotype. In addition, petromagnetic magnetic susceptibility aureoles are accompanied by the formation of metachronous natural residual magnetization vectors in kimberlite-bearing rocks. The size of petromagnetic aureoles (petromagnetic heterogeneities) may significantly exceed the size of the kimberlite pipe itself, which helps to identify and delineate the most promising areas. In addition, the magnetoseismic effect can create zones near kimberlite bodies that are difficult to penetrate for relatively viscous, protocrystal-rich basite magmas. This explains their wedging out along petrophysical barriers: splitting into low-power "tongues", formation of trap-free "windows" and "corridors", toroidal shafts with sharply increasing thickness in intrusions, etc. Having relatively elevated values of magnetic and density parameters, such magmatic formations will be reflected in the observed geophysical fields. Thus, it is reasonable to consider petromagnetic aureoles as one of the important petrophysical search criteria for the detection of indigenous kimberlite bodies.