Zeitschriftenartikel: „Electromagnetic-Based modeling“

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Yang, Tian Peng, und Qi Shuang Ma. „MOSFET Modeling Based on Electromagnetic Interference (EMI)“. Applied Mechanics and Materials 268-270 (Dezember 2012): 1299–303. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1299.

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On the basis of the lumped electric charge, the inner P type body region and the N-type drift region electric charge of VDMOSFET were respectively shown in three districts: accumulation, depletion, inversion. The application of carrier transport equation, continuity equation and Poisson equation, characterized different regions electric charge. According to the variation of the electric charge, the parasitic capacitances were determined, and the model parameters obtained by linear extrapolation and curve fitting. The MOSFET model was completed in MAST language. The results obtained experimentally with Boost circuit and by Saber software simulation confirm the accuracy of MOSFET model.

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Shi, Shouyuan, Brandon Redding, Tim Creazzo, Elton Marchena und Dennis W. Prather. „Quantum Electrodynamic Modeling of Silicon-Based Active Devices“. Advances in Optical Technologies 2008 (16.06.2008): 1–11. http://dx.doi.org/10.1155/2008/615393.

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We propose a time-domain analysis of an active medium based on a coupled quantum mechanical and electromagnetic model to accurately simulate the dynamics of silicon-based photonic devices. To fully account for the nonlinearity of an active medium, the rate equations of a four-level atomic system are introduced into the electromagnetic polarization vector. With these auxiliary differential equations, we solve the time evolution of the electromagnetic waves and atomic population densities using the FDTD method. The developed simulation approach has been used to model light amplification and amplified spontaneous emission in silicon nanocrystals, as well as the lasing dynamics in a novel photonic crystal-based silicon microcavity.

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Liang, Xiao Bin, Fan Tang, Jie Wu und Wei Zhen. „Electromagnetic Parameters Extraction of Electronic Current Transformer Based on Finite Element Modeling“. Advanced Materials Research 1070-1072 (Dezember 2014): 1085–91. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1085.

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Electronic current transformer is one of the key equipment of intelligent substation and has a direct impact to the correct operation of relay protection devices. In order to accurately establish the dynamic response model of electronic current transformer, it is needed to extract electromagnetic parameters of Rogowski coil, which is the electromagnetic coupling part of electronic current transformer. This paper builds the electromagnetic parameters model and extracts the electromagnetic distribution parameters of Rogowski coil based on the finite element method, then we use the equivalent method to calculate the lumped electromagnetic parameter. At last, comparing with the experimental results, a good accuracy of the simulation results based on finite element method is presented.

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Karaagac, U., J. Mahseredjian, I. Kocar, G. Soykan und O. Saad. „Partial Refactorization-Based Machine Modeling Techniques for Electromagnetic Transients“. IEEE Transactions on Power Delivery 31, Nr. 5 (Oktober 2016): 2370–78. http://dx.doi.org/10.1109/tpwrd.2016.2529662.

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Chobanyan, Elene, Dragan I. Olcan, Milan M. Ilic und Branislav M. Notaros. „Volume Integral Equation-Based Diakoptic Method for Electromagnetic Modeling“. IEEE Transactions on Microwave Theory and Techniques 64, Nr. 10 (Oktober 2016): 3097–107. http://dx.doi.org/10.1109/tmtt.2016.2598175.

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Huang, Chao Qun, und Fei Lai. „Modeling and Experimental Investigation on Vehicle Active Suspension Electromagnetic Actuator“. Applied Mechanics and Materials 278-280 (Januar 2013): 303–6. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.303.

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A new type of electromagnetic linear actuator for vehicle active suspension was designed, with the characteristics of large stroke and force and fast response. Combined with the finite element analysis software, the finite element model of the electromagnetic actuator was built up. Based on the simulation results, a prototype of electromagnetic linear actuator with appropriate parameters was developed. And the electromagnetic force test of the actuator was done. By comparison of the finite element simulation results and the experimental data, it shows the corresponding results are consistent, indicating that the design and analysis of the electromagnetic actuator is correct.

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Mishra, Anand Kumar, Romil Kumar und Somnath Sarangi. „Mathematical Modeling of Electromagnetic Levitation Based Active Suspension Using Bond Graph“. Applied Mechanics and Materials 575 (Juni 2014): 785–89. http://dx.doi.org/10.4028/www.scientific.net/amm.575.785.

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This paper offers motivation for modeling and simulation of an electromagnetic levitation based active suspension system (EMLASS) using bondgraph. Model of EMLASS contains 2 electromagnets as an unsprung mass and one magnet as sprung mass. Levitation based suspension is a novel technique to develop an active suspension over current technology. It has a high dynamic capability which is more sensitive for the road irregularities and its advantage is to provide additional stability to eliminate the effect of road irregularities. Our goal is to develop mathematical modeling and bondgraph modeling of EMLASS.

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Markov, M. B., und S. V. Parot’kin. „Modeling a Stationary Electromagnetic Field Based on the Maxwell Equations“. Mathematical Models and Computer Simulations 13, Nr. 2 (März 2021): 254–62. http://dx.doi.org/10.1134/s2070048221020101.

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Tasic, M., und B. Kolundzija. „Efficient electromagnetic modeling based on automated quadrilateral meshing of polygons“. Engineering Analysis with Boundary Elements 27, Nr. 4 (April 2003): 361–73. http://dx.doi.org/10.1016/s0955-7997(02)00124-8.

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Xueru Bai und Zheng Bao. „Imaging of rotation-symmetric space targets based on electromagnetic modeling“. IEEE Transactions on Aerospace and Electronic Systems 50, Nr. 3 (Juli 2014): 1680–89. http://dx.doi.org/10.1109/taes.2014.120772.

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Zhou, Yuan, Dongdong Zhang und Ping Yan. „Modeling of Electromagnetic Rail Launcher System Based on Multifactor Effects“. IEEE Transactions on Plasma Science 43, Nr. 5 (Mai 2015): 1516–22. http://dx.doi.org/10.1109/tps.2015.2403264.

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12

Wang, Zheng Shun, und Zhao Hui Zhen. „UG Simulation Design of Electromagnetic Dryer“. Advanced Materials Research 680 (April 2013): 398–401. http://dx.doi.org/10.4028/www.scientific.net/amr.680.398.

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The electromagnetic technology of drying Paper is that we use the principle of electromagnetic heating to dry paper, which is a new paper drying technology and quite different from the traditional steam drying . This thesis is based on the principle of electromagnetic induction, combined with technical requirement of paper drying. We used the AutoCAD software design a laboratory drying device with electromagnetic, and analyzed various parts of the selection and structure, by using UG software solid modeling, assembly modeling and other modules design a three-dimensional simulation of the various parts of the electromagnetic dryer device. The simulation graphics shown that the simulation design of electromagnetic dryer is more success, which can meet the requirements of drying paper evenly.

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Zhdanov, Michael S., Vladimir I. Dmitriev, Sheng Fang und Gábor Hursán. „Quasi‐analytical approximations and series in electromagnetic modeling“. GEOPHYSICS 65, Nr. 6 (November 2000): 1746–57. http://dx.doi.org/10.1190/1.1444859.

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The quasi‐linear approximation for electromagnetic forward modeling is based on the assumption that the anomalous electrical field within an inhomogeneous domain is linearly proportional to the background (normal) field through an electrical reflectivity tensor λ⁁. In the original formulation of the quasi‐linear approximation, λ⁁ was determined by solving a minimization problem based on an integral equation for the scattering currents. This approach is much less time‐consuming than the full integral equation method; however, it still requires solution of the corresponding system of linear equations. In this paper, we present a new approach to the approximate solution of the integral equation using λ⁁ through construction of quasi‐analytical expressions for the anomalous electromagnetic field for 3-D and 2-D models. Quasi‐analytical solutions reduce dramatically the computational effort related to forward electromagnetic modeling of inhomogeneous geoelectrical structures. In the last sections of this paper, we extend the quasi‐analytical method using iterations and develop higher order approximations resulting in quasi‐analytical series which provide improved accuracy. Computation of these series is based on repetitive application of the given integral contraction operator, which insures rapid convergence to the correct result. Numerical studies demonstrate that quasi‐analytical series can be treated as a new powerful method of fast but rigorous forward modeling solution.

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Deng, Zhao Xiang, und Fei Lai. „The Modeling of Electromagnetic Linear Actuator for Vehicle Active Suspension System“. Applied Mechanics and Materials 40-41 (November 2010): 127–32. http://dx.doi.org/10.4028/www.scientific.net/amm.40-41.127.

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A new type of electromagnetic linear actuator for vehicle active suspension system is designed. Combined with the finite element analysis tool and electromagnetic induction principle, the finite element model and mathematic model are built up individually. Based on the simulation results, a prototype of electromagnetic linear actuator is developed. By comparison of the finite element simulation results and the experimental data, it shows the correctness of actuator design and simulation model.

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Wu, Gui Ju, Xiang Yun Hu, Hui Liu und Guang Liang Yang. „Forward Modeling of Controlled-Source Electromagnetic Using Finite Element Method“. Applied Mechanics and Materials 448-453 (Oktober 2013): 3762–65. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3762.

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Controlled-source electromagnetic (CSEM) is an artificial source electromagnetic sounding method. which developed on the basis of magnetotelluric sounding. For showing the CSEM forward modeling result, numerical simulation method must be adopted. A discontinuous Galerkin finite element method is presented to solve problems based on formulation.

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Bia, Pietro, Luciano Mescia und Diego Caratelli. „Fractional Calculus-Based Modeling of Electromagnetic Field Propagation in Arbitrary Biological Tissue“. Mathematical Problems in Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/5676903.

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The interaction of electromagnetic fields and biological tissues has become a topic of increasing interest for new research activities in bioelectrics, a new interdisciplinary field combining knowledge of electromagnetic theory, modeling, and simulations, physics, material science, cell biology, and medicine. In particular, the feasibility of pulsed electromagnetic fields in RF and mm-wave frequency range has been investigated with the objective to discover new noninvasive techniques in healthcare. The aim of this contribution is to illustrate a novel Finite-Difference Time-Domain (FDTD) scheme for simulating electromagnetic pulse propagation in arbitrary dispersive biological media. The proposed method is based on the fractional calculus theory and a general series expansion of the permittivity function. The spatial dispersion effects are taken into account, too. The resulting formulation is explicit, it has a second-order accuracy, and the need for additional storage variables is minimal. The comparison between simulation results and those evaluated by using an analytical method based on the Fourier transformation demonstrates the accuracy and effectiveness of the developed FDTD model. Five numerical examples showing the plane wave propagation in a variety of dispersive media are examined.

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Bankov, S. E., und M. D. Duplenkova. „Electrodynamic Modeling of a Morgan Double-Layer Lens“. Радиотехника и электроника 68, Nr. 2 (01.02.2023): 107–20. http://dx.doi.org/10.31857/s0033849423020018.

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A multibeam antenna based on a Morgan double-layer lens in the form of plane waveguides coupled via a frequency-periodic array is investigated. The lens synthesis problems are considered. The analytical model of coupled plane waveguides is constructed. The model uses the equivalent boundary conditions. It is verified using the electromagnetic modeling in the HFSS system. An approximate electromagnetic model of the antenna is proposed. The model is based on the representation of the structure electromagnetic field inthe form of radial waves of coupled plane waveguides of the fundamental type. It is shown that, in the doublelayer lens, the effect of its shading by irradiators is substantially attenuated. This fact makes it possible to form the system of rays with fan-shaped patterns, which provides for the space view in the azimuth angle sector of 360°. The possibility of formation of narrow rays with the low level of the side and back irradiation is demonstrated.

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SIDOROV, V. N., TINT NAING WIN und V. M. ALAKIN. „MATHEMATICAL MODELING OF THE PROCESS OF A COMBINED LEVER AND ELECTROMAGNETIC SYSTEM OF LATERAL STABILIZATION“. World of transport and technological machines 4(82), Nr. 3 (2023): 18–25. http://dx.doi.org/10.33979/2073-7432-2023-3-4(82)-18-25.

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The article developed a block diagram and mathematical models of the processes of the lever-electromagnetic system of lateral stabilization in order to analyze the change in the roll angle of the GAZelle NEXT all-metal van during curvilinear movement with a lever stabilizer (without EMC) and using a system of lever-electromagnetic stabilization (with EMC). Modeling of a lever-electromagnetic transverse stabilization system with and without EMS in the Matlab&Simulink system is presented. As a result of modeling curvilinear motion, the effectiveness of using a lever-electromagnetic stabilization system (EMS) was proved in comparison with lever stabilizers (with-out EMS) based on a comparison of roll angles.

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Levchenko, Larysa. „Modeling the spatial distribution of magnetic fields of low frequency multiple sources“. Advanced Information Systems 5, Nr. 2 (22.06.2021): 34–37. http://dx.doi.org/10.20998/2522-9052.2021.2.05.

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The work is show that in conditions of dense the location of electrical equipment in the premises, buildings and on territories to ensure the regulatory levels of electromagnetic compatibility of personnel and the population, it is advisable to carry out preliminary modeling of the propagation of electromagnetic fields it is advisable. Considering the insignificant shielding of the magnetic field by the equipment cases, it is advisable to carry out modeling based on the magnetic component of the electromagnetic field. The mathematical ratio of the propagation of the magnetic field of individual sources, taking into account their dipole model, has been determined. The modeling was carried out for sources of the dipole and dipole-quadrupole types. Three-dimensional models of sources with the propagation of dipole, quadrupole and dipole-quadrupole harmonics of the field are provided, using the Matlab package. Application software has been developed in the C environment, using the SQL server database, and modeling of the propagation of the magnetic field of many sources in a certain plane has been carried out. This result is show that even for electrical equipment that operates to determine the reduced magnetic field isolines experimentally very difficult. At the design stages of equipment placement, modeling is the only tool for predicting the electromagnetic environment, which determines the electromagnetic compatibility of technical equipment and the electromagnetic safety of personnel and the public.

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Guo, Qi, Shengke Li, Shiwei Xia, Haiping Guo und Shuyong Li. „Electromagnetic Transient Modeling Method of Photovoltaic Power Station Based on FPGA“. Journal of Physics: Conference Series 2592, Nr. 1 (01.09.2023): 012087. http://dx.doi.org/10.1088/1742-6596/2592/1/012087.

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Abstract The rapid development of renewable energy needs the effective support of simulation technology. Aiming at the shortage of both modeling scale and simulation accuracy of the current large-scale photovoltaic power station, an electromagnetic transient modeling and real-time simulation method suitable for large-scale photovoltaic power stations are proposed. The microsecond accurate real-time simulation of 24 photovoltaic power units is implemented on a single FPGA. Through an equivalent modeling method, the electromagnetic transient model of a photovoltaic power unit including a PV array, DC boost circuit, grid-connected inverter, filter, and grid-side transformer is established. Then, based on the FPGA parallel computing and pipeline time division multiplexing technology, the updating framework of the station collecting network and the power unit is constructed, and the real-time simulation model of the station including 24 photovoltaic power units in 4 sub-stations is built. Finally, the microsecond real-time simulation of the photovoltaic power station is realized through RTRES, a self-developed real-time simulator in China’s Southern Power Grid. The comparison with the detailed PSCAD model shows that the simulation error is within ± 2%, which verifies the correctness of the proposed method and model.

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Zhang, Chi Jun, und Wang Sheng Liu. „Research on VR-Based Experiment Space for Complex Electromagnetic Environment“. Advanced Materials Research 403-408 (November 2011): 2923–26. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.2923.

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Virtual Reality technology is a hot research field in simulation of complex electromagnetic and its practical environment in the condition of information and high technology war. The paper discussed the main framework of spatial electromagnetic environment computing and simulating, presented realizing method and key arithmetic designing based on Virtual Reality Modeling Language. The work is evidently valuable for quantitative examinations, evaluation, and analysis of complex electromagnetic environment function, diversification, and effect on human beings, electronic units.

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Zheng, Jian Guo, Zhi Gang Zou, Hui Zeng und Tian Peng He. „Research of Modeling and Control Method for Electromagnetic Levitation System“. Applied Mechanics and Materials 651-653 (September 2014): 812–17. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.812.

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There has been wide interest in the control scheme of the electromagnetic levitation system due to its disadvantages of nonlinearity and open-loop uncertainty. A typical coil-ball levitation system is used in research. The forces of the ball are analyzed and a dynamic model of the whole electromagnetic levitation system is established. Based on the nonlinear state-space model, the coil-ball system is linearized and then a LQR control approach is proposed. Simulation results show that, compared with conventional pole assignment scheme, the electromagnetic levitation system under the proposed control approach gets a better performance, including smaller overshot and faster response.

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Zhang, Sheng Guo, Xiao Ping Dang und Kai Wang. „Modeling of Electromagnetic Force/Torque for Magnetically Levitated Planar Motor“. Applied Mechanics and Materials 373-375 (August 2013): 311–16. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.311.

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This paper models the electromagnetic force/torque of a long-stroke magnetically levitated planar motor. Based on the Lorenz force volume integral law and the force/torque superposition principle of rigid body, the electromagnetic force/torque is modeled. Experimenting results indicate the model is consistent with the measured results in sine distribution and sine period, and the errors between the model values and the measured values originate mainly from the measurement system. So this model represents analytically the electromagnetic forces and torques of the planar motor and it can be used to commutate and control the planar motor.

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Buyakova, N. V., A. V. Kryukov und Le Van Thao. „Integrated modeling of compact power lines“. E3S Web of Conferences 124 (2019): 05007. http://dx.doi.org/10.1051/e3sconf/201912405007.

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The aim of the research presented in the article is to develop methods and means for integrated modeling of compact expanded capacity power lines. Algorithms for determining modes of electrical energy systems were used based on phase coordinates based on application of elements models in form of lacelike equivalent networks with fully-meshed topology. These models and methods were implemented in Fazonord-APC software application, ensuring modeling of EES sta-tionary modes, and determining strengths of electromagnetic fields generated by power lines of different design. We demonstrate results of modes and electromagnetic fields modeling on routes of 220 kV compact overhead power supply lines (COPL) with horizontal positioning of wires. For the purpose of comparison, similar calculations were performed for a typical overhead power line (TOPL). The modeling results allowed to formulate the following conclusions: when overall sections of COPL and TOPL are equal, the losses of active power in compact OPL are significantly lower; thus, when transmitted power is 375 MW, the losses in COPL are reduced by 45% compared to a typical 220 kV OPL; at compact OPL receiver end a lower unsymmetry is observed; COPL ensure better electromagnetic safety conditions; electrical field strength at a height of 1.8 m for COPL axis is less than a similar index for TOPL by approximately 1.5 times; magnetic field in the same point is reduced to 60%.

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Cherno, O. O., und A. Yu Kozlov. „MODELING OF A CONTROLLED ELECTROMAGNETIC VIBRATION DRIVE WITH A VARIABLE RESONANT FREQUENCY“. Tekhnichna Elektrodynamika 2023, Nr. 4 (15.06.2023): 62–71. http://dx.doi.org/10.15407/techned2023.04.062.

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The technology for the production of high-quality concrete products includes the vibration of the concrete mixture at various frequencies. For this, an electromagnetic vibration drive can be used, which has high reliability, durability and controllability. For its effective application, it is necessary to adjust the resonance frequency of the oscillating system in order to ensure the near-resonance mode of operation at different frequencies. This is possible by using devices with adjustable stiffness, in particular, controlled dynamic vibration absorbers with nonlinear elastic elements. In the article the electromagnetic, electromechanical, mechanical, and energy processes in a controlled vibration system, which includes an electromagnetic vibrator and a vibration absorber with conical springs, the stiffness of which is regulated by compression using a press, have been investigated. Using the circle-field method, a mathematical and simulation model of electromagnetic and electromechanical processes in the vibrator has been developed. For this purpose, numerical calculations of the magnetic field in the vibrator have been performed and, based on the obtained results, the functional dependences between the electromagnetic force, magnetic flux, magnetomotive force and the size of the air gap have been determined. A model of the mechanics of the oscillating system, processes in the vibration absorber press drive and processes in the control system has been also developed. The built simulation models were combined into a general model in the Simulink environment, by means of which the time diagrams of the processes have been obtained. The modeling results show that the system provides a smooth transition from one vibration frequency to another while maintaining the specified amplitude of the working body oscillations and near-resonance mode with high energy efficiency. References 12, figures 10, tables 3.

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Zhdanov, Michael S., und Sheng Fang. „Quasi‐linear approximation in 3-D electromagnetic modeling“. GEOPHYSICS 61, Nr. 3 (Mai 1996): 646–65. http://dx.doi.org/10.1190/1.1443994.

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The Born approximation in electromagnetic (EM) numerical modeling has limited application for solving 3-D electromagnetic induction problems, because in structures with high conductivity contrasts and at high frequencies, this approximation is inaccurate. In this paper, we develop a new and relatively simple approximation for the EM field called a quasi‐linear approximation, which is based on the evaluation of the anomalous field [Formula: see text] by a linear transformation of the normal (primary) field: [Formula: see text], where [Formula: see text] is called the electrical reflectivity tensor. The reflectivity tensor inside inhomogeneities can be approximated by a slowly varying function that can be determined numerically by a simple optimization technique. The new approximation gives an accurate estimate of the EM response for conductivity contrasts of more than one hundred to one, and for a wide range of frequencies. It also opens the possibility for fast 3-D electromagnetic inversion.

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Hui, Zhejian, Xuben Wang, Changchun Yin und Yunhe Liu. „Efficient 3D Frequency Semi-Airborne Electromagnetic Modeling Based on Domain Decomposition“. Remote Sensing 15, Nr. 24 (05.12.2023): 5636. http://dx.doi.org/10.3390/rs15245636.

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Landslides are common geological hazards that often result in significant casualties and economic losses. Due to their occurrence in complex terrain areas, conventional geophysical techniques face challenges in early detection and warning of landslides. Semi-airborne electromagnetic (SAEM) technology, utilizing unmanned aerial platforms for rapid unmanned remote sensing, can overcome the influence of complex terrain and serve as an effective approach for landslide detection and monitoring. In response to the low computational efficiency of conventional semi-airborne EM 3D forward modeling, this study proposes an efficient forward modeling method. To handle arbitrarily complex topography and geologic structures, the unstructured tetrahedron mesh is adopted to discretize the earth. Based on the vector finite element formula, the Dual–Primal Finite Element Tearing and Interconnecting (FETI-DP) method is further applied to enhance modeling efficiency. It obtains a reduced order subsystem and avoids directly solving huge overall linear equations by converting the entirety problem into the interface problem. We check our algorithm by comparing it with 1D semi-analytical solutions and the conventional finite element method. The numerical experiments reveal that the FETI-DP method utilities less memory and exhibits higher computation efficiency than the conventional methods. Additionally, we compare the electromagnetic responses with the topography model and flat earth model. The comparison results indicate that the effect of topography cannot be ignored. Further, we analyze the characteristic of electromagnetic responses when the thickness of the aquifer changes in a landslide area. We demonstrate the effectiveness of the 3D SAEM method for landslide detection and monitoring.

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Yang, Tian Peng, und Qi Shuang Ma. „Modeling of the Diode for Electromagnetic Compatibility (EMC) Based on Saber“. Advanced Materials Research 462 (Februar 2012): 512–15. http://dx.doi.org/10.4028/www.scientific.net/amr.462.512.

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The diode model for EMC is built on the basis of lumped charge model. The model consists of forward recovery, reverse recovery and carrier recombination and is completed by MAST modeling language in Saber. The simulation results show that this model describes the forward and reverse recovery correctly.

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Mescia, Luciano, Pietro Bia und Diego Caratelli. „FDTD-Based Electromagnetic Modeling of Dielectric Materials with Fractional Dispersive Response“. Electronics 11, Nr. 10 (16.05.2022): 1588. http://dx.doi.org/10.3390/electronics11101588.

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The use of fractional derivatives and integrals has been steadily increasing thanks to their ability to capture effects and describe several natural phenomena in a better and systematic manner. Considering that the study of fractional calculus theory opens the mind to new branches of thought, in this paper, we illustrate that such concepts can be successfully implemented in electromagnetic theory, leading to the generalizations of the Maxwell’s equations. We give a brief review of the fractional vector calculus including the generalization of fractional gradient, divergence, curl, and Laplacian operators, as well as the Green, Stokes, Gauss, and Helmholtz theorems. Then, we review the physical and mathematical aspects of dielectric relaxation processes exhibiting non-exponential decay in time, focusing the attention on the time-harmonic relative permittivity function based on a general fractional polynomial series approximation. The different topics pertaining to the incorporation of the power-law dielectric response in the FDTD algorithm are explained, too. In particular, we discuss in detail a home-made fractional calculus-based FDTD scheme, also considering key issues concerning the bounding of the computational domain and the numerical stability. Finally, some examples involving different dispersive dielectrics are presented with the aim to demonstrate the usefulness and reliability of the developed FDTD scheme.

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Tao, Zhao, Wan Baoquan, Chen Xuan, Dong Chunzhu und Yin Hongcheng. „A modeling method for synthetical scene based on the electromagnetic model“. Procedia Computer Science 147 (2019): 499–503. http://dx.doi.org/10.1016/j.procs.2019.01.247.

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Moreau, F., R. Langlet, Ph Lambin, P. P. Kuzhir, D. S. Bychanok und S. A. Maksimenko. „Onion-like-carbon-based composite films: Theoretical modeling of electromagnetic response“. Solid State Sciences 11, Nr. 10 (Oktober 2009): 1752–56. http://dx.doi.org/10.1016/j.solidstatesciences.2008.10.010.

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Ji, Yanju, Yanpu Hu und Naoto Imamura. „Three-Dimensional Transient Electromagnetic Modeling Based on Fictitious Wave Domain Methods“. Pure and Applied Geophysics 174, Nr. 5 (23.03.2017): 2077–88. http://dx.doi.org/10.1007/s00024-017-1528-8.

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Yu, Mengping, Jinhong Chen, Dagang Wu, Yanjun Chen, Ji Chen und Hanming Wang. „A Finite-Difference-Based Multiscale Approach for Electromagnetic Digital Rock Modeling“. IEEE Journal on Multiscale and Multiphysics Computational Techniques 3 (2018): 66–73. http://dx.doi.org/10.1109/jmmct.2018.2850764.

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Shao, Fei. „Seek of Polishing Transmission Efficiency Based on Modeling over Wireless Charging“. Journal of Physics: Conference Series 2242, Nr. 1 (01.04.2022): 012041. http://dx.doi.org/10.1088/1742-6596/2242/1/012041.

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Abstract Among electric vehicle charging technologies, wireless charging technology is undoubtedly a most convenient method, also needless to get refreshed and repaired as wires do. Nevertheless, it has long been a tough issue that the efficiency remains low, which causes great waste and too much heat even add to the possibility of fire emergency. Due to low charging efficiency and non-universal charging equipment, wireless charging equipment for electric vehicles has not been effectively promoted. Based on this, integrated circuit theory and electromagnetic field equation, this paper established electromagnetic coupling wireless charging circuit model, based on this model, the maximum wireless charging power transmission efficiency and the maximum horizontal offset and other issues are studied.

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Zhang, Hai Tao, Hiromi Nagaum, Yu Bo Zuo und Jian Zhong Cui. „Numerical Modeling of Low Frequency Electromagnetic Casting of 7XXX Aluminum Alloys“. Materials Science Forum 546-549 (Mai 2007): 707–12. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.707.

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Low frequency electromagnetic casting is a new developed technology that appears in the recent years. In this paper, a comprehensive mathematical model has been developed to describe the interaction of the multiple physics fields during LFEC (low frequency electromagnetic casting) process. The model is based on a combination of the commercial finite element package ANSYS and the commercial finite volume package FLUENT, with the former for calculation of the electromagnetic field and the latter for calculation of the magnetic driven fluid flow, heat transfer and solidification. Moreover, the model has been verified against the temperature measurements obtained from one 7XXX aluminum alloy billet of 200mm in diameter, during the LFEC casting processes, respectively. There was a good agreement between the calculated results and the measured results. Further, the effects of electromagnetic frequency on fluid flow, temperature field and solidification during LFEC process have investigated numerically by using the mathematic model. The choosing criterion of the electromagnetic frequency during LFEC process has been used in order to obtain the best structure of the billets by analyzing the effects of fluid flow and temperature field on the solidification process in the presence of electromagnetic field.

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Plessix, R. E., M. Darnet und W. A. Mulder. „An approach for 3D multisource, multifrequency CSEM modeling“. GEOPHYSICS 72, Nr. 5 (September 2007): SM177—SM184. http://dx.doi.org/10.1190/1.2744234.

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We discuss a practical approach for multisource, multifrequency controlled-source electromagnetic (CSEM) modeling. The approach consists of an efficient iterative multigrid-based solver and an automatic gridding procedure. For a given frequency and a given source location, the automatic gridding procedure ensures that the computational grid is consistent with the discretization of the electromagnetic equations. The conductivity is mapped from the input grid onto the automatically defined computational grid by volume averaging. This mapping changes the conductivity representation. Volume averaging based on the logarithm of the conductivity provides the best result. When the stretching in the computational grid is moderate, we use a multigrid method based on full coarsening. However, when the stretching is more severe, we propose a more robust multigrid method based on semicoarsening. Numerical examples show the usefulness of this approach for survey design and scenario studies over complex heterogeneous structures, when the layered-earth assumption is not satisfactory.

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Kozar, Valentyn Ivanovich, Volodymyr Serhiiovych Bakhariev, Nadiia Pavlіvna Halchenko und Yevhen Viktorovych Dorozhko. „CONCEPTUAL MODELING OF THE DATABASE OF GIS MONITORING OF ELECTROMAGNETIC POLLUTION OF SETTLEMENTS“. Collection of Scientific Works of the Ukrainian State University of Railway Transport, Nr. 202 (22.12.2022): 36–48. http://dx.doi.org/10.18664/1994-7852.202.2022.273613.

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The article presents the results of conceptual modeling of the geospatial database for monitoring electromagnetic pollution of settlements. Recently, the world has seen a rapid increase in the number of sources and the level of electromagnetic radiation. This can negatively affect people's health and their environment. The analysis of the publications showed that today researchers have formed a theoretical base for assessing the impact of electromagnetic radiation on people and the environment, developed models of the propagation of electromagnetic waves, ways and methods of protection against their harmful effects. However, not enough attention has been paid to monitoring the electromagnetic pollution of settlements. Systematic measurements of electromagnetic field levels are carried out only by individual EU countries Systematic control of this type of pollution is not carried out in Ukraine, there are no regulatory documents regarding the procedure for its monitoring, but the maximum permissible levels of electromagnetic fields for the population are established. Data on the distribution of electromagnetic fields are interdisciplinary in nature and necessarily contain an indication of the location of objects. For their effective processing, it is advisable to use geo-information technologies. Based on the results of the analysis of the subject area of electromagnetic pollution monitoring, a conceptual data model was developed. It is described using UML tools. The model contains two sets of data. The basic set of geospatial data includes information about buildings of various purposes, land plots, streets, highways, railways, engineering communications, relief, soils, hydrography, territory zoning, facility addresses. The profile set includes data on electromagnetic radiation sources and their sanitary protection zones, control points, the results of calculations and measurements of radiation parameters, the relative level of electromagnetic fields and the building restriction zones. The proposed model can be the basis of the physical modeling of the settlement's electromagnetic pollution monitoring system.

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Chen, Hao, Qifeng Liu, Yongming Li, Chen Huang, Huaiqing Zhang und Yinxiang Xu. „Research on the Method of Near-Field Measurement and Modeling of Powerful Electromagnetic Equipment Radiation Based on Field Distribution Characteristics“. Energies 16, Nr. 4 (17.02.2023): 2005. http://dx.doi.org/10.3390/en16042005.

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With the wide application of power equipment consisting of high switching frequencies and large current switching devices in the integrated power system on ships, the low-frequency radiation interference caused by the powerful electromagnetic equipment becomes more and more serious. Establishing an equivalent model of radiation interference based on the near-field measurement data is the key to subsequent electromagnetic compatibility design. Due to the large size of the equipment, there will be many measurement points in the near-field measurement area, which leads to long testing times and low modeling efficiency. To solve the above problems, this article first proposes a method of near-field measurement and a modeling method of powerful electromagnetic equipment radiation based on field distribution characteristics. Firstly, the near-field measurement data are obtained by the sparse and uniform sampling of the near-field measurement plane at large sampling intervals. Then, the near-field measuring plane is separated into several regions by the magnetic field’s distribution characteristics. The near-field measurement data required for modeling are obtained by further sampling in the region with a large magnetic field amplitude. Finally, the equivalent radiation model is obtained by the equivalent dipole method. Simulations and experiments show that the method can significantly reduce the amount of measurement data and testing time while improving the efficiency of equivalent radiation modeling and maintaining the accuracy of the modeling.

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Chen, Gang, Weigong Zhang und Bing Yu. „Multibody dynamics modeling of electromagnetic direct-drive vehicle robot driver“. International Journal of Advanced Robotic Systems 14, Nr. 5 (01.09.2017): 172988141773189. http://dx.doi.org/10.1177/1729881417731896.

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Collaborative dynamics modeling of flexible multibody and rigid multibody for an electromagnetic direct-drive vehicle robot driver is proposed in the article. First, spatial dynamic equations of the direct-drive vehicle robot driver are obtained based on multibody system dynamics. Then, the shift manipulator dynamics model and the mechanical leg dynamics model are established on the basis of the multibody dynamics equations. After establishing a rigid multibody dynamics model and conducting finite element mesh and finite element discrete processing, a flexible multibody dynamics modeling of the electromagnetic direct-drive vehicle robot driver is established. The comparison of the simulation results between rigid and flexible multibody is performed. Simulation and experimental results show the effectiveness of the presented model of the electromagnetic direct-drive vehicle robot driver.

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Mukherjee, Souvik, und Mark E. Everett. „3D controlled-source electromagnetic edge-based finite element modeling of conductive and permeable heterogeneities“. GEOPHYSICS 76, Nr. 4 (Juli 2011): F215—F226. http://dx.doi.org/10.1190/1.3571045.

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A new 3D controlled-source electromagnetic finite element (FE) modeling algorithm is presented which is capable of handling local inhomogeneities in the magnetic permeability and electrical conductivity distribution of buried geologic and anthropogenic structures. An ungauged, coupled-potential formulation of the governing electromagnetic vector diffusion and scalar continuity equations is used. The formulation introduces magnetic reluctivity, the inverse of magnetic permeability, to facilitate a separation of secondary and primary potentials. The governing equations are solved using a tetrahedral edge-based FE method. The postprocessing steps to obtain electromagnetic fields are outlined. The code is validated for non-magnetic and permeable conductive structures by comparisons against analytic and previously published numerical solutions. Some limitations of the implementation are explored and directions are proposed for its further development.

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Fhager, Andreas, Shantanu K. Padhi, Mikael Persson und John Howard. „Antenna Modeling and Reconstruction Accuracy of Time Domain-Based Image Reconstruction in Microwave Tomography“. International Journal of Biomedical Imaging 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/343180.

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Nonlinear microwave imaging heavily relies on an accurate numerical electromagnetic model of the antenna system. The model is used to simulate scattering data that is compared to its measured counterpart in order to reconstruct the image. In this paper an antenna system immersed in water is used to image different canonical objects in order to investigate the implication of modeling errors on the final reconstruction using a time domain-based iterative inverse reconstruction algorithm and three-dimensional FDTD modeling. With the test objects immersed in a background of air and tap water, respectively, we have studied the impact of antenna modeling errors, errors in the modeling of the background media, and made a comparison with a two-dimensional version of the algorithm. In conclusion even small modeling errors in the antennas can significantly alter the reconstructed image. Since the image reconstruction procedure is highly nonlinear general conclusions are very difficult to make. In our case it means that with the antenna system immersed in water and using our present FDTD-based electromagnetic model the imaging results are improved if refraining from modeling the water-wall-air interface and instead just use a homogeneous background of water in the model.

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Yao, X., X. S. Liu, Z. X. Li, J. M. Zhu und X. G. Wang. „Electromagnetic modeling and multi-field coupling simulation for conductive rubber embedded in shells“. Journal of Physics: Conference Series 2478, Nr. 2 (01.06.2023): 022006. http://dx.doi.org/10.1088/1742-6596/2478/2/022006.

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Abstract Our living environment and the battlefield witness an increase in electromagnetic energy density due to the emergence of electronic electrical equipment, such as automobiles, communication devices, computers. To adapt to the environment and improve the electromagnetic compatibility of equipment, conductive rubber is increasingly being used in electrical equipment. However, due to the lack of simulation parameters and incomplete simulation methods, the current electromagnetic simulation of conductive rubber cannot meet the needs of supporting engineering applications. This paper presents the test results for the electromagnetic characteristics of a conductive rubber material, develops a simulation model of the material based on test data, and verifies the model through experiments in the real working environment. Results show that the simulation model is valid.

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Germain, Sophie, Sylvain Engels und Laurent Fesquet. „High Level Current Modeling for Shaping Electromagnetic Emissions in Micropipeline Circuits“. Journal of Low Power Electronics and Applications 9, Nr. 1 (29.01.2019): 6. http://dx.doi.org/10.3390/jlpea9010006.

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In order to fit circuit electromagnetic emissions within a spectral mask, a design flow based on high level current modeling for micropipeline circuits is proposed. The model produces a quick and rough estimation of the circuit current, thanks to a Timed Petri Net determining the activation instants of the different micropipeline stages and an asymmetric Laplace distribution modeling the current peaks of the activated stages. The design flow exploits this current estimation for shaping the electromagnetic emissions by setting the controller delays of the micropipeline circuits. The delay adjustment is performed by a genetic algorithm, which iterates until the electromagnetic emissions match the targeted spectral mask. In order to evaluate the technique, an Advanced Encryption Standard (AES) circuit has been designed. We first observed that the obtained current curve fits well with a gate simulation. Then, after shaping the electromagnetic emissions, the simulation shows that the spectrum fits within the spectral mask.

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Zhukovskiy, Mikhail Evgenievich, und Varvara Alekseevna Egorova. „Modeling of the radiation induced electromagnetic field in finely-disperse media“. Mathematica Montisnigri 52 (2021): 52–65. http://dx.doi.org/10.20948/mathmontis-2021-52-6.

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Algorithms for supercomputer modeling of the radiation electromagnetic field in heterogeneous materials of a complex finely-dispersed structure are constructed. A geometric model of a heterogeneous medium is created using Stilinger-Lubachevsky algorithms for multimodal structures. The model includes a system of detectors for statistical evaluation of functionals on the space of solutions of the photon-electron cascade transport equations. Algorithms for the three-dimensional approximation of the results of modeling the radiation transport in a fine-dispersed medium to an electrodynamic difference grid are developed. The approximation methods based on the technology of neural networks. The method of numerical solution of the complete system of Maxwell's equations for calculating the electromagnetic field in a fine-dispersed medium is worked out. The results of demonstration calculations of the electromagnetic field are presented. The results of the calculations show that the spatial distribution of the radiation electromagnetic field has a sharply inhomogeneous structure caused by the presence of boundaries of materials with different radiation properties.

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Aroua, Fatima Zohra, Ahmed Salhi, Rezig Mohamed und Djemai Naimi. „Modeling and Simulation of a cooking inductors by Electromagnetic Induction“. All Sciences Abstracts 1, Nr. 2 (25.07.2023): 25. http://dx.doi.org/10.59287/as-abstracts.1215.

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The fundamental concepts of induction heating have been discovered and applied to industrial processes since the 1920s. Its principle is based on the direct application of two physical laws, Lenz's law, and the Joule effect. The development of electromagnetic induction principles in cooking systems is progressing, as they offer better working conditions, good safety, high energy efficiency, and low pollution. Induction heating is the transmission of electromagnetic energy through the surface of a heated material via three physical phenomena: permeability, electrical conductivity and thermal conductivity, depending on temperature. This electro-thermal technique permits electrical conductive materials to be heated without physical contact with an electrical source. In particular, the study of the inductor position in the heating plate can improve and normalize the induction heating temperature. In this work, we proposed several geometries for cooking inductor position based on numerical modeling of induction heating processes using the finite element method on Matlab to solve all electromagnetic problems. The chosen geometrical model with 3 inductors has a good temperature distribution in the heating plate of about 650 K (377 C).

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Yang, Liu, Yun Feng Jia und Dong Lin Su. „Modeling and Simulation of Helicopter Cabin Electromagnetic Environment“. Advanced Materials Research 383-390 (November 2011): 5615–20. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5615.

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Electromagnetic environment (EME) in helicopter cabin is one of the most important indexes for electromagnetic compatibility (EMC) on airborne platform. The simulation results were not accurate enough because of the difficulties in accurately modeling and the large computation. Due to the inaccuracy of the former modeling method which used the typical geometric, the professional software ICEMCFD/AI*Environment (AIE) was employed to restore the helicopter’s original model, based on the obtain of the accurate helicopter model, the Multi-layer Fast Multipole Method (MLFMM) and Combined Field Integral Equation (CFIE) were employed to analyze the variation of the electric field in the helicopter cabin versus the frequency and other factors with a VHF antenna mounted on the helicopter. Both accuracy and computing speed were concerned, the results have some guidance significance to the EMC preliminary design on airborne platform.

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Qin, De Chun, Dong Lin Su und Nan Kai Wu. „Electromagnetic Susceptibility Analysis Method of Electro-Explosive Devices“. Applied Mechanics and Materials 229-231 (November 2012): 949–52. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.949.

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Electro-explosive device (EED) is easily influenced by electromagnetic interference (EMI) in war-field. To study the electromagnetic susceptibility of EED, the method based on full-wave physical modeling and resonance effect simulation is presented. The EMS of non-contact fuse is analyzed as an example. The test data validate the correction of the EMS analysis method, which is of great value for reference to Electromagnetic compatibility (EMC) design of EED.

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Budnarowska, Magdalena, und Jerzy Mizeraczyk. „Use of the waveguide technique to measure the electromagnetic parameters of materials“. Scientific Journal of Gdynia Maritime University, Nr. 115 (30.09.2020): 7–13. http://dx.doi.org/10.26408/115.01.

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The paper presents and discusses selected simulation and measurement possibilities of an upgraded waveguide measuring stand for testing electromagnetic properties of selected materials (including metamaterials), based on the microwave propagation technique. The stand is equipped with the CST Studio Suite software, which enables modeling and simulation of broadly defined electromagnetic interactions, and the N1500A Materials Measurement Suite module for processing the results of measurements of electromagnetic properties of materials.

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Yan, Rongge, Jinbo Jiang, Qingxin Yang und Kang An. „Modeling and Verification of Electromagnetic-Thermal Coupling for Electromagnetic Track Launch Considering the Dynamic Conductivity“. Applied Sciences 13, Nr. 15 (28.07.2023): 8739. http://dx.doi.org/10.3390/app13158739.

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In order to solve the problems of insufficient precision of the armature velocity and inductance gradient in the process of finite element calculation of the electromagnetic track launcher, an improved dynamic conductivity electromagnetic-thermal coupling model is proposed to make the calculated results closer to the actual working condition. Firstly, the finite element analysis for the electromagnetic-thermal field is carried out. Then, considering the influence of dynamic conductivity on the armature velocity and inductance gradient, an improved dynamic conductivity electromagnetic-thermal coupling model based on finite element analysis is established, whose parameters are identified by the proposed PSO-GA hybrid algorithm. Moreover, the predicted values of armature velocity and inductance gradient are also obtained. Finally, the experimental platform of the electromagnetic track launcher is built to verify the improved model. By comparing the predicted value of the improved model with the experimental test value, it is found that the improved model can further reduce the calculated error from 5.79% to 1.18%, which provides a certain theoretical basis for the full true simulation of the electromagnetic track launch.

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Nikitin, G. S., und T. N. Win. „Results of dynamic simulation of the lateral stability of a light van when curvilinear movement“. Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 8, Nr. 4 (25.12.2022): 322–29. http://dx.doi.org/10.22281/2413-9920-2022-08-04-322-329.

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The article presents the results of developing a methodology and implementing dynamic modeling in the SolidWorks Motion 2016 software environment for changing the body roll angle of the Gazelle Next van during active maneuvering and turning using a lever-electromagnetic stabilization system in comparison with a lever stabilizer system. A dynamic modeling technique was developed to analyze the change in the roll angle of the Gazelle NEXT all-metal van in the driving mode when turning and intensive maneuvering with a lever and using a lever-electromagnetic stabilization system). As a result of the research, a decrease in the roll angle of the Gazelle Next all-metal van was revealed in driving modes with active maneuvering and cornering using the lever-electromagnetic stabilization system relative to that installed on the example of the Gazelle NEXT — lever. The proposed method of dynamic modeling proved the effectiveness of using a lever-electromagnetic stabilization system when turning and active maneuvering, compared with standard lever stabilizers based on a comparison of the roll angles of the first and second options.

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