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Journal articles on the topic 'Electromagnetic calculation'

Author: Grafiati

Published: 28 June 2021

Last updated: 17 February 2022

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1

Viktorov, V. A. "METHODOLOGY FOR CALCULATING ELECTROMAGNETIC FIELDS GENERATED BY AN AUTOMATED WORKPLACE OF AN OBJECT OF INFORMATIZATION." RADIO COMMUNICATION TECHNOLOGY, no. 46 (September 30, 2020): 30–44. http://dx.doi.org/10.33286/2075-8693-2020-46-30-44.

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A methodology for calculating electromagnetic fields generated by an automated workstation of an object of informatization has been developed. Using the presented methodology, it becomes possible to form a complete scheme of electromagnetic radia-tion of the space under study. Based on the output of the calculation of electromagnet-ic fields, the permissible time spent by the operator at each point of his workplace is calculated. For the first time, electromagnetic radiation sources are modeled by a com-bination of elementary electric dipoles powered by various harmonic components. The reliability of the illustrated methodology was carried out by comparing the calculated values of the parameters of electromagnetic fields with the measured values of the lev-els at given frequencies.

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2

Podgornovs, Andrejs, and Antons Sipovichs. "Electromechanical Battery EMB Mass Minimization taking into Account its Electrical Machines Rotor Energy." Electrical, Control and Communication Engineering 7, no. 1 (December 1, 2014): 5–10. http://dx.doi.org/10.1515/ecce-2014-0017.

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Abstract In this paper the electromechanical battery (EMB) with synchronous machine is described. Theoretically, if electrical machines rotor stored energy is known, it is possible to reduce the flywheel mass of electromechanical battery. For example, the efficiency of energy recovery (kilowatt-hours out versus kilowatthours in) in nowadays appliances exceeds 95 % which is considerably better than of any electrochemical battery, such as lead-acid battery. For the rotor stored energy amount calculation, it is necessary to find all geometrical dimensions of the electrical machine. To achieve this goal the iterative calculation method was used. Electromechanical battery mass was analyzed as a discharge process rotation speed function. Taking into account the rotor stored energy, we can increase the minimum rotation speed thus reducing the electrical machine mass and increasing the flywheel mass, which provides EMB cost reduction. Additionally, the possibilities of using numerical approximation calculations of magnetization curves are discussed. Each iteration of numerical application necessary for the method for rapid calculation is essential when calculating the field problems. Nowadays there are a lot of computer added design programs for electromagnetic field calculation in different types of applications, electrical machines and apparatus. For the electromagnetic field calculation process some more commonly used magnetization curve approximation methods are described, and the machine calculation time is tested for different numbers of calculations.

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3

Orlov, S. A. "PHOTON MASS." International Journal of Research -GRANTHAALAYAH 6, no. 3 (March 31, 2018): 49–54. http://dx.doi.org/10.29121/granthaalayah.v6.i3.2018.1497.

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The atomic structure is presented on the basis of the theory of vortex gravitation. The feasibility and calculation of the values of the density and mass of electromagnetic particles are proposed. A calculation is made, which proves that the photon must have mass. In the calculations, some physical characteristics of electromagnetic particles that are accepted by modern physics are refuted.

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4

Ding, Feng, Yunyun Gao, and Jianhui Tian. "A Novel Method for Output Characteristics Calculation of Electromagnetic Devices using Multi-kernel RBF Neural Network." Applied Computational Electromagnetics Society 35, no. 8 (October 7, 2020): 855–63. http://dx.doi.org/10.47037/2020.aces.j.350802.

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The action performance and reliability of electromagnetic devices is critical to the entire working system. In this paper, a new method for calculating the output characteristics of electromagnetic devices is proposed. This method uses the multi-kernel radial basis function neural network (MK-RBFNN) approximation modeling by the finite element calculation results at the key nodes. It obtains the output response of the electromagnetic device under different coil voltages and air gaps. The key of establishing a MK-RBFNN is to obtain the weight coefficients of each single-kernel radial basis function (RBF) model by using a heuristic weighting strategy. When the electromagnetic output characteristics is calculated in the optimization design of the electromagnetic device, this method solves the problem that the traditional method is difficult to balance the calculation accuracy and speed. The effectiveness of the method is verified by the calculation results of the electromagnetic torque of a typical electromagnetic relay.

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5

Goby, F., and A. Razek. "Numerical calculation of electromagnetic forces." Mathematics and Computers in Simulation 29, no. 5 (October 1987): 343–50. http://dx.doi.org/10.1016/0378-4754(87)90069-3.

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6

Lu, Ying, Zhibin Zhao, Jian gong Zhang, and Zheyuan Gan. "Analysis on the Influence of the Height of Tower on Passive Interference in shortwave." E3S Web of Conferences 64 (2018): 05005. http://dx.doi.org/10.1051/e3sconf/20186405005.

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The passive interference of transmission lines to nearby radio stations may affect the effective reception and transmission of radio station signals. Therefore, the accurate calculation of the electromagnetic scattering of transmission lines under the condition of external electromagnetic waves is the basis for determining the reasonable avoidance spacing of the two. For passive stations operating in short-wave frequencies, passive interference is mainly generated by the tower. This paper uses the method of moments to perform passive interference calculations under normal circumstances, And elaborates the method for calculating the electromagnetic field of the transmission line, obtains the space electric field intensity of the transmission line at the same working frequency and space location of the plane wave. Uses the approximate formula to inductive the formula for calculating height of tower and the protective distance.

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7

Wu, Xiao Yu, Zhe Ming Chen, and Ze Hao Huang. "Analysis and Calculation of Electromagnetic Torque for the Voltage Source Traction Motors." Applied Mechanics and Materials 446-447 (November 2013): 672–77. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.672.

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The traction motor installed on the high-speed train is powered by inverter. A large number of harmonics may appear when motor is operating. Then the motor speed generate oscillation and finally the dynamic characteristic is affected in vehicle system. In this paper, relied on the electromagnetism of traction motor, the mechanism about emerging harmonic torque is analyzed. In addition, based on the equivalent circuit, the method of calculating the parameters in harmonic circuit is proposed. Two mathematical formulas are also proposed to obtain the fundamental electromagnetic torque and the harmonic electromagnetic torque on traction motor. The time domain and frequency domain distributions of the torques are gained and analyzed. Finally a calculation example of traction motor harmonic torque was analyzed and calculated, and prepared for further study of harmonic torque impacting on vehicle system dynamic performance.

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8

Gurova, Elena G. "Eddy Current Impact Estimation in Designing Vibroisolator with 3D Electromagnetic Stiffness Compensator." Applied Mechanics and Materials 792 (September 2015): 519–23. http://dx.doi.org/10.4028/www.scientific.net/amm.792.519.

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In this research the method of the calculation of the power losses in DC electromagnet through eddy currents, which are analog of the viscous friction, is presented. The influence of these currents on the operation of the vibroisolator with the electromagnetic stiffness compensator is estimated. The losses of the power on eddy currents are less than 1 per cent of the electromagnet power itself and the compensator totally. The example of the calculation of the losses for eddy currents in steel conductor is also shown.

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9

Li, Yong Gang, Guo Wei Zhou, Yu Ca Wu, and He Ming Li. "Impact of Rotor Inter-Turn Short-Circuit on Generator Rotor Force." Applied Mechanics and Materials 143-144 (December 2011): 125–31. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.125.

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This paper analyzes the calculation method of unbalanced electromagnetic force by rotor winding inter-turn short-circuit fault, analytical calculating method neglects saturation, cogging and other factors, so the calculation accuracy is not high, in order to accurately calculate the magnetic field and the unbalanced electromagnetic force, this paper propose to analyze generator magnetic field by a finite element software Ansys, the obtained magnetic field data are further used to analyze the distributed electromagnetic force and the total force that generator rotor suffered, electromagnetic force distribution law of different slots, different levels of inter-turn short-circuit are got, which provide a basis for further studying the full force on generator rotor.

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10

Huang, Lei, Huang Xin Cheng, and Mei Wang. "Study on Selection Method of Analogy Line in High Voltage Transmission Project Environmental Impact Assessment." Applied Mechanics and Materials 209-211 (October 2012): 1126–30. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.1126.

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This article integrate the theoretical calculation of the power-frequency electromagnetic field intensity and radio interference intensity under transmission line, and analyze the factor which influence the value and distribution of the electromagnetic field, radio interference under transmission line, aiming to provide basis and reference for other environmental assessment of electromagnetism. The study shows that a reasonable selection of analog lines can get an accurate result as the theoretical calculation. Important factors of analog lines selection including: grade of voltage, current, height of line, location order of line, number of circuit, section area of line, number of bundle conductors.

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11

Chen, Feng, Qingquan Gan, and Boyi Yu. "Development of the Electromagnetic Calculation Software Package for a Synchronous Motor Based on the Field-Circuit Combination Algorithm." Wireless Communications and Mobile Computing 2021 (August 9, 2021): 1–6. http://dx.doi.org/10.1155/2021/5120174.

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Nowadays, domestic motor manufacturers often use high-speed circuit and magnetic circuit parameters in engine models. In addition, the calculation accuracy is low and cannot fully meet the requirements of a modern engine design. The field-circuit combination algorithm is based on electric field analysis, which avoids many rough assumptions and empirical formulas; its calculations are more accurate and reliable than traditional algorithms. It is used to analyze and calculate the steady-state operating conditions and characteristics of motors, which can effectively improve the design level of China’s boss synchronous motors. This article mainly introduces software algorithms and auxiliary FDTD methods. In this article, we use the field-circuit coupling algorithm to develop an electromagnetic calculation software package for synchronous motors and establish a mathematical model for the potential field-circuit coupling algorithm. We use the cassette electromagnetic calculation program to solve the model, evaluate the synchronous motor, and use historical data to modify the model and improve the accuracy of the development-state evaluation of the electromagnetic calculation software package for the synchronous motor based on the motor electromagnetic circuit coupling algorithm. The experimental results of this article show that the field circuit combination algorithm increases the development of the electromagnetic calculation software package for synchronous motors by 55% and reduces the false alarm rate and false alarm rate. Finally, by comparing the phases of traditional algorithms, we analyzed the excitation circuit combination algorithm to calculate the parameters and performance of the synchronous motor.

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12

Mei, Nan, Xiao Yu Wang, Xin Wang, Hua Fang Li, Min Hong Wei, Jin Liu, and Song Shi. "Research on Shielding Effectiveness Calculation Method of Electromagnetic Shielding Materials." Solid State Phenomena 304 (May 2020): 137–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.304.137.

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Electromagnetic shielding materials are widely used in engineering. Shielding effectiveness is an important index to measure the shielding effect of electromagnetic shielding materials. A method for calculating the shielding effectiveness of electromagnetic shielding materials is discussed in this paper. This method applies the small reflection theory in transmission line theory. Two kinds of materials are selected as samples. Firstly, the shielding performance is calculated by calculation. Then, shielding performance was measured using a network analyzer and coaxial devices. By comparing the above two results, the feasibility of this method is verified. By using this method, the shielding performance with acceptable accuracy can be obtained when the electromagnetic parameters of the material are known. Thus, the limitation for the application of electromagnetic shielding materials is reduced.

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13

Lu, Ying, Zhibin Zhao, Jian gong Zhang, and Zheyuan Gan. "Analysis on the Influence of Transmission Lines span on Passive Interference in Shortwave." E3S Web of Conferences 64 (2018): 05004. http://dx.doi.org/10.1051/e3sconf/20186405004.

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The passive interference of transmission lines to nearby radio stations may affect the effective reception and transmission of radio station signals. Therefore, the accurate calculation of the electromagnetic scattering of transmission lines under the condition of external electromagnetic waves is the basis for determining the reasonable avoidance spacing of the two. For passive stations operating in short-wave frequencies, passive interference is mainly generated by the tower, and span is one of the most significant factors affecting passive interference. This paper uses the method of moments to carry out the passive interference calculations under normal circumstances, expounds the method of calculating the electromagnetic field of transmission line at the same time. And elaborates the method for calculating the electromagnetic field of the transmission line, obtains the space electric field intensity of the transmission line at the same working frequency and space location of the plane wave. Applying the approximate formula to calculate the formula for the span and critical distance between the observation point and the transmission line.

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14

Renner, D. B., R. Brower, D. Dolgov, N. Eicker, Th Lippert, J. W. Negele, A. Pochinsky, and K. Schilling. "Calculation of nucleon electromagnetic form factors." Nuclear Physics B - Proceedings Supplements 119 (May 2003): 395–97. http://dx.doi.org/10.1016/s0920-5632(03)01565-2.

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15

Zhi-gang, Wang, Wan Shao-long, and Wang Ke-lin. "Calculation of kaon electromagnetic form factor." Chinese Physics 10, no. 6 (June 2001): 497–500. http://dx.doi.org/10.1088/1009-1963/10/6/307.

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16

FUJINO, Shinpei, Shoji SATOU, Shoji TANIGUCHI, Takehiko TOH, and Keisuke FUJISAKI. "Magnetohydrodynamic Calculation Method for Electromagnetic Sensor." Tetsu-to-Hagane 92, no. 2 (2006): 53–57. http://dx.doi.org/10.2355/tetsutohagane1955.92.2_53.

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17

Liu, Xiao Jing, and Ye Fa Hu. "Calculation of Radial Active Magnetic Bearing Electromagnetic Force under Eccentric Rotor." Advanced Materials Research 443-444 (January 2012): 649–54. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.649.

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As for active magnetic bearing, ordinary electromagnetic force formula based on air gap well-distributed. However, radial active magnetic bearing always face the situation that the rotor is eccentric and the air gap doesn’t well-distributed. This paper gives the calculation method of the electromagnetic force at that situation through calculating the air gap and using integrative approach. Then analysis the influence factors---eccentric rotor distance from center and eccentric angle to electromagnetic force. The result can provide the basis for suspension characteristic of active magnetic bearing.

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18

He, Bing, Long Tang, Jiang Xie, XiaoWei Wang, and AnPing Song. "Parallel Numerical Simulations of Three-Dimensional Electromagnetic Radiation with MPI-CUDA Paradigms." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/823426.

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Using parallel computation can enhance the performance of numerical simulation of electromagnetic radiation and get great runtime reduction. We simulate the electromagnetic radiation calculation based on the multicore CPU and GPU Parallel Architecture Clusters by using MPI-OpenMP and MPI-CUDA hybrid parallel algorithm. This is an effective solution comparing to the traditional finite-difference time-domain method which has a shortage in the calculation of the electromagnetic radiation on the problem of inadequate large data space and time. What is more, we use regional segmentation, subregional data communications, consolidation, and other methods to improve procedures nested parallelism and finally verify the correctness of the calculation results. Studying these two hybrid models of parallel algorithms run on the high-performance cluster computer, we draw the conclusion that both models are suitable for large-scale numerical calculations, and MPI-CUDA hybrid model can achieve higher speedup.

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19

LIU, NIAN, CHI XIE, YING LIU, LU LIU, and KE-XUN JIANG. "NEW FINITE ELEMENT METHOD OF ELECTROMAGNETIC CALCULATION FOR COMPLEX ELECTROMAGNETIC FIELDS." Modern Physics Letters B 21, no. 11 (May 10, 2007): 655–62. http://dx.doi.org/10.1142/s0217984907013110.

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In order to increase greatly the calculation accuracy and the computation speed for complex electromagnetic fields in modern physics, a new finite element method, which has the high computation accuracy, fast computation speed and less computer storage requirements, is presented in this paper. The new method with a high-order finite element without internal nodes is introduced to compute and analyze some complex electromagnetic fields in the electron accelerators. In this paper, the complex electromagnetic field in an electromagnetic device has been calculated successfully by the finite elements, and the electromagnetic properties of the electromagnetic device under the specific work condition is analyzed and evaluated. Good agreement is found between the computed values and the experimental values.

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20

Leliuk, Mykola, and Victoriia Lytvynenko. "Medium voltage vacuum circuit breaker with per phase electromagnetic actuator." Bulletin of NTU "KhPI". Series: Problems of Electrical Machines and Apparatus Perfection. The Theory and Practice, no. 1 (5) (May 28, 2021): 21–25. http://dx.doi.org/10.20998/2079-3944.2021.1.04.

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In medium voltage vacuum circuit breakers, in order to achieve an even distribution of force along the entire length of the drive shaft, the drive mechanism is made per phase, that is, a separate electromagnet is installed under each pole. The analysis of designs and features of operation of vacuum circuit breakers with a per phase electromagnetic drive is carried out. Deficiencies in the designs of these drives have been identified. The design of a vacuum circuit breaker with a per phase electromagnetic drive and a kinematic diagram of the operation of a vacuum circuit breaker with a monostable polarized electromagnet and a return spring during the closing operation are considered. As a per phase drive, it is proposed to use three monostable polarized electromagnets with return springs, which makes it possible to reduce the overall dimensions of not only the drive electromagnet, but also the vacuum circuit breaker. Moreover, the return spring is not included in the design of the proposed electromagnet, but is part of the circuit breaker drive mechanism. The design of the housing of the vacuum circuit breaker with a per phase drive and a synchronizing shaft has been developed, which makes it impossible for the non-simultaneous closing and opening of the main contacts when performing switching operations. The calculation of a monostable polarized electromagnet is carried out and the possibility of its use as a per-phase drive in a medium voltage vacuum circuit breaker is confirmed.

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21

LIU, NIAN, and CHI XIE. "A HYBRID FINITE ELEMENT CALCULATION OF COMPLEX ELECTROMAGNETIC FIELDS." Modern Physics Letters B 22, no. 04 (February 10, 2008): 269–74. http://dx.doi.org/10.1142/s0217984908014833.

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In order to increase to a greater extent the calculation accuracy for complex electromagnetic fields in the modern physics, a hybrid finite element method (HFEM) is presented for analysis and simulation of complex electromagnetic fields. In the paper, the hybrid finite element method (HFEM) with high accuracy is introduced, and the complex electromagnetic field in an electromagnetic device has been calculated successfully by the hybrid finite element method (HFEM) and the electromagnetic properties of the electromagnetic device under the specific work condition is evaluated. It is shown that the method can provide a much more accurate calculation and good agreement between the computed values and the experimental values.

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22

Hryshchenko, V. O. "Modeling and calculation power saving modes grain drying materials under energy fields." Naukovij žurnal «Tehnìka ta energetika» 11, no. 3 (November 18, 2020): 23–29. http://dx.doi.org/10.31548/machenergy2020.03.023.

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Storing grain quality materials in post harvest handling and storage is largely dependent on correctly implemented the drying process. In agricultural production mainly use costly convection dryer. The main share of wasteful energy consumption accounts for heat drying agent, some heat is lost to the environment through the working surface of the dryers and spent coolant. Ways to reduce these energy costs is to reduce the amount of drying agent in the process to the level necessary to absorb and remove moisture from the dryer and the working volume of the principles of targeted "delivery" of energy to vysushuyemoho material. Last principles successfully implemented using contactless energy supply of electromagnetic fields in a material exposure by microwave or infrared radiation. The article deals with the theoretical background processes of drying material in cyclic mode with infrared heating and high frequency electromagnetic field. The equations change over time settings grain material by heating using high frequency electromagnetic field or infrared light and ventilation in the grain does not allow heated air drying cycle count process. The algorithm calculating the overall process of drying cycle to determine rational modes of the process, providing minimize energy costs. The article deals with the theoretical background processes of drying material in cyclic mode with infrared heating and high frequency electromagnetic field. The equations change over time settings grain material by heating using high frequency electromagnetic field or infrared light and ventilation in the grain does not allow heated air drying cycle count process. The algorithm calculating the overall process of drying cycle to determine rational modes of the process, providing minimize energy costs. The article deals with the theoretical background processes of drying material in cyclic mode with infrared heating and high frequency electromagnetic field. The equations change over time settings grain material by heating using high frequency electromagnetic field or infrared light and ventilation in the grain does not allow heated air drying cycle count process. The algorithm calculating the overall process of drying cycle to determine rational modes of the process, providing minimize energy costs. The equations change over time settings grain material by heating using high frequency electromagnetic field or infrared light and ventilation in the grain does not allow heated air drying cycle count process. The algorithm calculating the overall process of drying cycle to determine rational modes of the process, providing minimize energy costs. The equations change over time settings grain material by heating using high frequency electromagnetic field or infrared light and ventilation in the grain does not allow heated air drying cycle count process. The algorithm calculating the overall process of drying cycle to determine rational modes of the process, providing minimize energy costs.

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23

Panchenko, B. A., O. P. Ponomarev, and D. V. Denisov. "Quick calculation of Luneberg lens scattering signature." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 2 (June 30, 2017): 21–25. http://dx.doi.org/10.38013/2542-0542-2017-2-21-25.

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The paper focuses on solving the problem of diffraction of a linear polarization electromagnetic wave on multilayer bodies of a spherical shape, i.e. a metal sphere with a dielectric cover and Luneberg lens. For this purpose tensor Green function method was used. Within the research we described the electrodynamic system verifying the expressions obtained for the calculation of electromagnetic fields. Furthermore, we compared the obtained results of calculations with the results of simulation of a similar problem in the software package ANSYS HFSS . Finally, we estimated the computational burden and computing time for solving the problem in two ways

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24

Ji, Ai Guo, and De Shui Liu. "Application of Matlab to write a Script for HFSS’s Eigenmode Solution of Circular Cavity." Applied Mechanics and Materials 385-386 (August 2013): 1240–43. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1240.

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With the rapid development of modern electromagnetics, a lot of electromagnetic field numerical methods are maturing. 3D electromagnetic simulation software HFSS has two solutions including incentive solving and eigenmode solving. When solving the calculation of the structure of eigenmodes or resonant type can use eigenmode solver. Using matlab generate HFSS scripting language-based program to set eigenmode solution is a very convenient and very innovative approach. The program on a circular cavity modeling and eigenmode solution set simulation results meet the design requirements.

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25

Xu, Da, Xuesong Liu, Kun Fang, and Hongyuan Fang. "Calculation of electromagnetic force in electromagnetic forming process of metal sheet." Journal of Applied Physics 107, no. 12 (June 15, 2010): 124907. http://dx.doi.org/10.1063/1.3437201.

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26

Li, Xian Mao, Tian Lin Dong, and Gao Ming Huang. "Accurate Calculation Receiving Power of the Electromagnetic Wave Scattering between Two Stations on Sea Surface." Advanced Materials Research 989-994 (July 2014): 1135–40. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.1135.

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This paper studies receiving power of electromagnetic wave scattering on sea surface transmitted by directional antenna. Analyzes different overlapping conditions of transmitter beaming and receiver beaming on the sea surface, deduces the calculation formulae, and calculation of the receiving power of scattering wave in case of different across angle between radiator and receiver beams on sea surface. The result shows that the across angle is a important factor of receiver to receive electromagnetic wave scattering power on sea surface, and it gives an accurately calculating method by receiver to receive electromagnetic wave scattering power from sea surface. The method can apply to the condition that radar or jammer transmitters beam to sea surface and reconnaissance or radar receiving the scattering power from sea surface at another position, etc..

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27

Wu, Yingnian, Lin Zhang, and Lan Mu. "Electromagnetic Computation and Visualization of Transmission Particle Model and Its Simulation Based on GPU." Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/942106.

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Electromagnetic calculation plays an important role in both military and civic fields. Some methods and models proposed for calculation of electromagnetic wave propagation in a large range bring heavy burden in CPU computation and also require huge amount of memory. Using the GPU to accelerate computation and visualization can reduce the computational burden on the CPU. Based on forward ray-tracing method, a transmission particle model (TPM) for calculating electromagnetic field is presented to combine the particle method. The movement of a particle obeys the principle of the propagation of electromagnetic wave, and then the particle distribution density in space reflects the electromagnetic distribution status. The algorithm with particle transmission, movement, reflection, and diffraction is described in detail. Since the particles in TPM are completely independent, it is very suitable for the parallel computing based on GPU. Deduction verification of TPM with the electric dipole antenna as the transmission source is conducted to prove that the particle movement itself represents the variation of electromagnetic field intensity caused by diffusion. Finally, the simulation comparisons are made against the forward and backward ray-tracing methods. The simulation results verified the effectiveness of the proposed method.

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28

KONNIKOV, Igor’ A. "Electromagnetic Field Calculation in a Stratified Medium." Elektrichestvo, no. 7 (2017): 60–67. http://dx.doi.org/10.24160/0013-5380-2017-7-60-67.

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29

Paikov, I. A., and А. I. Tikhonov. "Analysis of power transformer electromagnetic calculation models." Vestnik IGEU, no. 3 (2015): 38–43. http://dx.doi.org/10.17588/2072-2672.2015.3.038-043.

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30

Zini, H., and G. Ratta. "Multirate Modeling Scheme for Electromagnetic Transients Calculation." IEEE Transactions on Power Delivery 19, no. 1 (January 2004): 240–47. http://dx.doi.org/10.1109/tpwrd.2003.817745.

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31

Penman, J., and M. D. Grieve. "Efficient calculation of force in electromagnetic devices." IEE Proceedings B Electric Power Applications 133, no. 4 (1986): 212. http://dx.doi.org/10.1049/ip-b.1986.0029.

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32

Fujisaki, K., T. Ueyama, and K. Okazawa. "Magnetohydrodynamic calculation of in-mold electromagnetic stirring." IEEE Transactions on Magnetics 33, no. 2 (March 1997): 1642–45. http://dx.doi.org/10.1109/20.582585.

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33

Ogawa, K., Y. Horiuchi, and N. Fujii. "Calculation of electromagnetic forces for magnet wheels." IEEE Transactions on Magnetics 33, no. 2 (March 1997): 2069–72. http://dx.doi.org/10.1109/20.582723.

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34

Semchuk, A. R. "Calculation of electromagnetic frequencies of cylindrical resonators." Journal of Mathematical Sciences 69, no. 5 (May 1994): 1285–88. http://dx.doi.org/10.1007/bf01259269.

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35

Demenko, Andrzej, and Dorota Stachowiak. "Electromagnetic torque calculation using magnetic network methods." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 27, no. 1 (January 4, 2008): 17–26. http://dx.doi.org/10.1108/03321640810836591.

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36

Fu, Guo Hong, and Bin Xiong. "The Calculation of 2.5D Transient Electromagnetic Response." Applied Mechanics and Materials 36 (October 2010): 349–54. http://dx.doi.org/10.4028/www.scientific.net/amm.36.349.

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A 2.5D finite element forward algorithm for TEM with block linear conductivity was put forward in this paper. Firstly, based on the Maxwell equations, 2-order dual differential equation along strike was obtained by Laplace and Fourier transform. Then finite element linear equation system was obtained from coupling differential equation by using the Galerkin method, and yields the numerical solution of 2.5D transient electromagnetic field. The conductivity in finite element mesh is linear but uniform. In addition, the total field is decomposed into background field and secondary field: the former is solved by analytical method, and the latter is calculated by numerical method. Finally, 2.5D transient electromagnetic response curves of several typical geoelectric section models were computed.

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37

Quiney, H. M., H. Skaane, and I. P. Grant. "Relativistic calculation of electromagnetic interactions in molecules." Journal of Physics B: Atomic, Molecular and Optical Physics 30, no. 23 (December 14, 1997): L829—L834. http://dx.doi.org/10.1088/0953-4075/30/23/001.

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38

Garbet, X., L. Laurent, F. Mourgues, J. P. Roubin, and A. Samain. "Variational calculation of electromagnetic instabilities in tokamaks." Journal of Computational Physics 87, no. 2 (April 1990): 249–69. http://dx.doi.org/10.1016/0021-9991(90)90253-w.

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Draper, Terrence, Keh-Fei Liu, D. B. Leinweber, and R. M. Woloshyn. "Lattice calculation of baryonic electromagnetic form factors." Nuclear Physics A 527 (May 1991): 531–34. http://dx.doi.org/10.1016/0375-9474(91)90150-5.

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Wang, Xiao Guang, Qian Liu, Yi Jing Zhang, and Hao Hui Chen. "Research on Characteristic of Electromagnetic Force of Magnetic Suspension Device with Large Air-Gap." Applied Mechanics and Materials 401-403 (September 2013): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.239.

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The electromagnetic force is an important characteristic parameter for magnetic suspension device, and magnetic circuit method is often used to calculate the electromagnetic force in engineering. However, it is not accurate to use magnetic circuit method to calculate electromagnetic force for magnetic suspension devices with large air-gap. In this paper three kinds of methods are used to study on the characteristic of electromagnetic force of magnetic suspension device with large air-gap: experimental, ANSYS calculation and magnetic circuit calculation method. Investigate the property and the variation regular pattern of electromagnetic force. Analyze the error distribution of magnetic circuit calculation method and find out the causes of errors, and then deduce a modified magnetic circuit formula to calculate the electromagnetic force of magnetic suspension device with large air-gap.

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Zhang, Kai Chuang, Xin Bao Gao, and Hui Ning Le. "Torque Analysis and Simulation Calculation of Flying Fixed Canard." Applied Mechanics and Materials 624 (August 2014): 202–6. http://dx.doi.org/10.4028/www.scientific.net/amm.624.202.

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Projectiles with fixed canard trajectory correction kit use Brushless DC motor (BLDC) with position sensorless to control fixed canard. Through the roll in the process of fixed canard trajectory correction kit flight direction by moment analysis and simulation, then electromagnetic torque values range is determined. Control effect of electromagnetic torque simulation, determine from the electromagnetic torque to meet the requirements in the process of correction.

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Dong, Hongbao, Yao Zhao, Hua Yuan, Xiaocai Hu, and Zhen Yang. "A Simplified Calculation Method of Heat Source Model for Induction Heating." Materials 12, no. 18 (September 11, 2019): 2938. http://dx.doi.org/10.3390/ma12182938.

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Line heating is used in forming the complex curve plates of ships, and this process is becoming integrated into automated tools. Induction heating equipment has become commonly used in automatic line heating. When applying automated equipment, it is necessary to calculate the relationship between the heating parameters and the temperature field. Numerical methods are primarily used to accomplish the calculations for induction heating. This computation process requires repeated iterations to obtain a stable heat generation rate. Once the heat generation rate changes significantly, a recalculation takes place. Due to the relative position of the coil and plate changes during heating, the grid needs to be frequently re-divided during computation, which dramatically increases the total computation time. In this paper, through an analysis of the computation process for induction heating, the root node that restricts the computation efficiency in the conventional electromagnetic-thermal computation process was found. A method that uses a Gaussian function to represent the heat flux was proposed to replace the electromagnetic computation. The heat flux is the input for calculating the temperature field, thus avoiding the calculation of the electromagnetic analysis during induction heating. Besides, an equivalence relationship for multi-coil was proposed in this paper. By comparing the results of the experiment and the numerical method, the proposed heat source model’s effectiveness was verified.

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Voevodskii, K. E., and V. M. Strepetov. "The method of conditional boundary." Transportation systems and technology 2, no. 3 (September 15, 2016): 133–44. http://dx.doi.org/10.17816/transsyst201623133-144.

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The goal of this work is to propose a new approach to the calculation of electromagnetic field that excited by the eddy current induced in the conductive environment the influence of an external magnetic field source. The quasistationary approximation accepted, that is, the bias currents do not take into account. Method. The main feature of the method is the introduction of so-called conditional boundary. This name is given for mental surfaces, which can be done in the area, free of conductive environment. Boundary form is arbitrary and dictated by considerations of calculations convenience. The agreement that the same boundary conditions, like on the conductor-vacuum boundary are performed. We prove that this task change leads to a change in its decisions only outside of the conductor and the only for part of the electric field. Magnetic induction vector throughout the space, as well as electric field tension vector in the conductive environment do not change. At the same time, a good choice of conditional boundary in some cases allows to simplify the task with calculation point of view. In addition to the conditional boundaries introduction, some formal basic conversion ratios are proposed, describing quasistationary electromagnetic field. These changes had the same goal to simplify calculations. The result. The new formulation of task of quasistationary electromagnetic field calculation is received in the form of differential equations system and boundary conditions, including both known ratio and the newly received. The new formulation is equivalent to traditional (with the above proviso). However, it has some advantages in terms of ease of calculation. The practical significance. In practice of specific calculations the method would be useful, particularly in cases when the form guide is close to some "simple" form.

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Xia, Sheng Zhu, Xian Ming Deng, Zhi Ye Wang, and Meng Liu. "Analysis to Coupled Electromagnetic-Thermal Field of Brushless Doubly Fed Machine." Advanced Materials Research 433-440 (January 2012): 7312–17. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7312.

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this paper build up the brushless doubly fed machine (BDFM) finite element model of the coupled electromagnetic-thermal field, the electromagnetic joule heat calculated in electromagnetic environment will be loaded as the heat source to calculate in thermal field, the calculated results in thermal field will be the initial conditions to calculate the electromagnetic field, get the thermal field distribution when the motor is stable through cycle calculation at last. Calculation results show the effectiveness of this method.

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Khodakovskyi, Oleksii, Larysa Levchenko, Vadym Kolumbet, Anna Kozachuk, and Dmytro Kuzhavskyi. "Calculation apparatus for modeling the distribution of electromagnetic fields of different sources." Advanced Information Systems 5, no. 1 (June 22, 2021): 34–38. http://dx.doi.org/10.20998/2522-9052.2021.1.04.

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The calculation apparatus acceptable for assumptions and simplifications and sufficient for errors of final results for modeling the propagation of electric, magnetic and electromagnetic fields spread over a certain area was proposed. It is shown that to model the propagation of ultra-low frequency electric and magnetic fields (monitors, uninterruptible power supplies, transformers, electric motors and generators) it is possible to consider these sources as dipole and dipole-quadrupole type sources. That is, the field of the local source can be considered as a combination of electric and magnetic dipoles. This makes it possible to delineate with sufficient accuracy the zones of exceeding the maximum allowable field strengths. The calculation apparatus used to determine the radiation intensities of civil aviation radar equipment was adapted to model the propagation of electromagnetic fields of very high and ultra-high frequencies. The calculations of coefficients that take into account the parameters of radiation patterns in the horizontal and vertical planes for the most common radiation sources are given. These ratios and corresponding coefficients can be used to determine the electromagnetic environment in the presence of many high-frequency sources (mobile communication base stations, navigation equipment, radio relay stations, etc.). The proposed approach allows to automate processes of designing the placement of electromagnetic, electronic and radio equipment in production areas and territories, as well as to assess the environmental impact at the stages of design work. This will make it possible to delineate the isolines of the limits of exceeding the maximum permissible levels of electric magnetic and electromagnetic fields for different frequency ranges and categories of equipment and to automatically determine the electromagnetic load at each point of the controlled space.

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Jing, Yong Teng, Yan Li, Longnv Li, Man Hua Jiang, and Ning Wang. "Calculation and Analysis of Temperature Rise in Transformer Tank Based on Electromagnetic-Thermal Coupling Method." Applied Mechanics and Materials 513-517 (February 2014): 3459–62. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3459.

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Hot-spot calculation of structure parts in large power transformer has been concerned by transformer designer and researcher. The key is the calculation of leakage magnetic field, loss and temperature rise in structure parts of transformer, belongs to the calculation of the electromagnetic-thermal coupling field. This paper calculate and analysis electromagnetic field and temperature field of a transformer tank using ANSYS analysis software based on electromagnetic fields, heat transfer theory, and the results and the test data are in good agreement; aim at the problem of local overheating, appropriate magnetic shields are used to reduce the stray losses and hot-spot temperature-rise in transformer structure parts. so the calculation method can be applied engineering design.

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SYTIN, A. V., А. А. KIRICHEK, N. V. TOKMAKOV, and O. V. YAKOVLENKO. "CALCULATION OF FLOOR BEARING WITH FERROMAGNETIC LIQUID OF TURBOGENERATORS OF POWER DISTRIBUTION SYSTEMS." Fundamental and Applied Problems of Engineering and Technology 3 (2021): 153–60. http://dx.doi.org/10.33979/2073-7408-2021-347-3-153-160.

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The article discusses ways to solve the problem of wear of the rotor bearings of turbine units at the moments of start–up and shutdown. The concept of a new type of elastic–damping combined sliding bearings, which combines the use of ferromagnetic fluids in the design of multi–blade bearings, is proposed. On the basis of this, a design of a petal bearing with an electromagnetic effect on elastic elements and a ferromagnetic lubricant has been proposed. The properties and features of the use of ferromagnetic fluids in precision engineering as a lubricant are described. A mathematical model of an electromagnetic petal bearing with a ferromagnetic fluid is proposed on the basis of the Reynolds equation from the course of magnetohydrodynamics, Maxwell's equations for a magnetic field, a system of equations in displacements based on the theory of cylindrical shells. An algorithm for the operation of the rotor support during start–up, shutdown, as well as when the power supply of the electromagnets is turned off.

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Sadowski, N., Y. Lefevre, M. Lajoie‐Mazenc, and J. P. A. Bastos. "CALCULATION OF TRANSIENT ELECTROMAGNETIC FORCES IN AN AXISYMMETRICAL ELECTROMAGNET WITH CONDUCTIVE SOLID PARTS." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 11, no. 1 (January 1992): 173–76. http://dx.doi.org/10.1108/eb051780.

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Wang, Wei, Hang Wang, and Hamid Reza Karimi. "Study on the Characteristics of Electromagnetic Noise of Axial Flux Permanent Magnet Synchronous Motor." Abstract and Applied Analysis 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/764105.

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The normal electromagnetic force distribution in stator system of axial flux permanent magnet synchronous motor (PMSM) has been thoroughly analyzed in this paper. The main composition of force wave causing vibration and noise has been proposed, and at the same time a calculation method of stator natural frequency of axial flux PMSM has been raised. Through this method electromagnetic force wave, natural frequency, vibration response, and electromagnetic noise of a 15 kW axial flux PMSM with 22 poles and 24 slots have been calculated; calculations and measured values are consistent by comparison. The noise sources of axial flux PMSM have been found in this paper, which provides the theoretical support for the suppression of electromagnetic noise of axial flux PMSM.

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50

Zhang, Bo, Kim Wann Engebretsen, Gianluca Fiandaca, Hongzhu Cai, and Esben Auken. "3D inversion of time-domain electromagnetic data using finite elements and a triple mesh formulation." GEOPHYSICS 86, no. 3 (May 1, 2021): E257—E267. http://dx.doi.org/10.1190/geo2020-0079.1.

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Over several decades, much research has been done to develop 3D electromagnetic inversion algorithms. Due to the computational complexity and the memory requirements for 3D time-domain electromagnetic (TEM) inversion algorithms, many real-world surveys are inverted within one dimension. To speed up calculations and manage memory for 3D inversions of TEM data, we have developed an approach using three uncoupled meshes: an inversion mesh, a forward-model mesh, and a mesh for Jacobian calculations. The inversion mesh is a coarse regular and structured mesh, such that constraints are easily enforced between the model parameters. Forward responses are calculated on a dense unstructured mesh to obtain accurate electromagnetic fields, whereas the Jacobian is calculated on a coarse unstructured mesh. We found that using a coarse mesh for the Jacobian is sufficient for the inversion to converge and, equally important, that it provides a significant speed boost in the overall inversion process, compared to calculating it on the forward-modeling mesh. The unstructured meshes are made of tetrahedral elements, and the electromagnetic fields are calculated using the finite-element method. The inversion optimization uses a standard Gauss-Newton formulation. For further speed up and memory optimizing of the inversion, we use domain decomposition for calculating the responses for each transmitter separately and parallelize the problem over domains using OpenMP. Compared to a 1D solution, the accuracy for the Jacobian is 1%–5% for the dense mesh and 2%–7% for the coarse mesh, but the calculation time is approximately five times faster for the coarse mesh. We also examined the algorithm on a small ground-based TEM data set acquired in an area where a 3D earth distorts the electromagnetic fields to such a degree that a 1D inversion is not feasible.

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