International Journal of Applied Electromagnetics and Mechanics - Volume 51, issue s1

Article Type: Editorial

DOI: 10.3233/JAE-2024

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S1-, 2016

Authors: Tan-Kim, Antoine | Lanfranchi, Vincent | Legranger, Jérôme | Palleschi, Frédéric

Article Type: Research Article

Abstract: The acoustic optimization of claw-pole alternators can be carried out with finite element simulations but suffers from long electromagnetic computation time (i.e. 3D transient simulations). On the other hand, analytical models cannot predict magnetic forces with accuracy in such machines. Therefore, a new hybrid model is proposed in order to achieve a better compromise between simulation time and accuracy. This model is based on a finite element model which takes saturation and tangential forces into account and an analytical model that computes the airgap flux density and its variation over time. Magnetic forces are then calculated and input into a …vibro-acoustic model. Results show good agreement with the full finite element model which was validated experimentally. Show more

Keywords: Claw-pole, alternator, vibrations, acoustic

DOI: 10.3233/JAE-2023

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S3-S11, 2016

Authors: Stuikys, A. | Rotaru, M. | Sykulski, J.K.

Article Type: Research Article

Abstract: A field modelling approach is presented exploiting approximate magnetic flux distributions. The method is an extension of flux-tubes and tubes-and-slices techniques. A combination of an equivalent magnetic circuit approach with improved description of relevant flux paths allows for a computationally efficient algorithm suitable for design optimization. The method is illustrated using an example of a linear switched reluctance motor and validated using finite element simulations.

Keywords: Switched reluctance motor, design optimization, flux tube modelling, flux linkage estimation, non-linear magnetic circuits, magnetic equivalent circuits

DOI: 10.3233/JAE-2022

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S13-S21, 2016

Authors: Souron, Quentin | Le Besnerais, Jean | Hecquet, Michel

Article Type: Research Article

Abstract: This article demonstrates the use of a mathematical method to efficiently discriminate and visualize each circumferential vibration wavenumber involved in the yoke deflections of an electrical machine under electromagnetic excitations. This post-processing, which can be applied on both experimental and simulation data, allows to calculate the participation factor of each magnetic force wavenumber at a particular frequency. It is therefore a powerful visualization tool to understand the origin of magnetic vibrations and acoustic noise. The resulting graphs, called ``spatiograms'' as an analogy of the spectrograms done at variable speed, are based on the Discrete Fourier Transformation of the accelerations measured …along the machine circumference. This paper explains the post-processing calculation and shows some numerical and experimental validation on both an induction machine and a permanent magnet synchronous machines. Show more

Keywords: Spectrogram, magnetic noise, magnetic vibrations, post-processing, electrical machines, resonance, operational deflection shape

DOI: 10.3233/JAE-2021

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S23-S32, 2016

Authors: Komȩza, Krzysztof | Dems, Maria | Wiak, Sƚawomir

Article Type: Research Article

Abstract: This paper presents the analysis of the influence of rotor design: massive or cage on high speed small power induction motors parameters. For these analyzes were used both field-circuit method and circuit analytical method. As could be predicted massive rotor motor is characterized by higher losses and thus less efficiency than the squirrel cage motor, especially with copper cage. Despite the massive motors are easier to manufacture and the specific construction may be used.

Keywords: High speed induction machine, rotor design, field and circuit simulation, analytical simulation

DOI: 10.3233/JAE-2012

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S33-S40, 2016

Authors: Januszkiewicz, Ƚukasz | Barba, Paolo Di | Hausman, Sƚawomir

Article Type: Research Article

Abstract: The paper presents the exploitation of a lowest-order algorithm of evolutionary computing (EStra) for identifying the parameters of a simplified human body model (phantom). A simplified model is well suited in view of the computationally-expensive field simulation of wearable antennas located in a close proximity to the human body. In the paper, an automated procedure based on evolutionary computing and Finite Difference Time Domain (FDTD) computational electrodynamics method is proposed to identify the parameters of the simplified model. Subsequently, after identifying the parameter values, the simplified model is compared to a heterogeneous anthropomorphic human-body model. The comparison is based on …the analysis of impedance matching of the same dipole antenna located on both the anthropomorphic and simplified phantoms. Show more

Keywords: Parameter identification, evolutionary computing, finite-difference time domain, human body model, wearable antennas

DOI: 10.3233/JAE-2009

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S41-S47, 2016

Authors: Wiak, S. | Firych-Nowacka, A. | Barba, Paolo Di | Slusarek, Barbara

Article Type: Research Article

Abstract: The paper focus is on the generation of 3-D field models of probes for Radio-Frequency Ablation (RFA). The authors propose a multiphysics three-dimensional models for curved-electrode probes, which can be used to optimize placement and exploitation of the probes. The first model consists of tumor tissue and liver tissue. The second one is extended by fat tissue. The diameter of whole model is thirty centimetres, which corresponds to the waist size of the adult human. Both conduction field and transient thermal field in the tissues are simulated by means of finite-element method.

Keywords: RF ablation, computer models, FEM

DOI: 10.3233/JAE-2007

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S49-S56, 2016

Authors: Zygiridis, Theodoros T. | Kantartzis, Nikolaos V. | Tsiboukis, Theodoros D.

Article Type: Research Article

Abstract: The subject of this paper pertains to the construction of finite-difference expressions with minimized, as well as controllable discretization errors, suitable for 3D FDTD simulations in large-scale setups. The proposed spatial approximations are designed to mimic the behavior of the exact operators, when applied to plane-wave trial functions. To eliminate undesirable directional dependencies, the expansion of proper error formulae in terms of spherical harmonic functions is performed, which facilitates accuracy improvement and produces optimized operator coefficients in closed-form expressions. The combination of the new operators with low- as well as high-order time integrators yields efficient space-time discrete models, whose reliability …renders them desirable substitutes for other traditional solutions. Show more

Keywords: Finite-difference time-domain (FDTD) method, numerical dispersion, optimized algorithms, spherical harmonics

DOI: 10.3233/JAE-2010

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S57-S66, 2016

Authors: Khairi, R. | Razek, A. | Bernard, L. | Corcolle, R. | Bernard, Y. | Pichon, L. | Poirier-Quinot, M. | Ginefri, J.C.

Article Type: Research Article

Abstract: In this work an electromagnetic compatibility (EMC) analysis is performed by means of a dedicated finite element simulation of magnetic resonance imaging (MRI) environment to determine the impact of hosting in the scenery different materials and structures necessitated in guided interventions. The results obtained by simulation could be used for the design and optimization of devices used in such environment (actuator, mechatronics…).

Keywords: EMC analysis, MRI, image-guided interventions, electromagnetic fields, 3D finite elements

DOI: 10.3233/JAE-2018

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S67-S74, 2016

Authors: Gonçalves, S.T.M. | Tomaz, L.M. | Resende, U.C. | Afonso, M.M. | Coppoli, E.H.R. | Vollaire, C.

Article Type: Research Article

Abstract: The Ultra Wideband (UWB) technology is promising for data communications over short distances at high data rates. Since the antenna design is critical in the development of UWB systems, this paper proposes a new geometry for a microstrip UWB antenna. The modifications suggested are difficult to analyze because the proposed antenna is constructed using the high lossy FR4 fiber glass and the geometry does not conform with the FDTD mesh. Appropriate modifications on the FDTD method are done and the results are compared with the commercial software CST simulations and experimental results.

Keywords: FDTD/CPML, FR-4 microstrip antennas, ultra wideband - UWB

DOI: 10.3233/JAE-2008

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S75-S80, 2016