International Journal of Applied Electromagnetics and Mechanics - Volume 59, issue 1

Authors: Mazauric, Vincent

Article Type: Editorial

DOI: 10.3233/JAE-171114

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 1-2, 2019

Authors: Debray, Quentin | Meunier, Gerard | Chadebec, Olivier | Coulomb, Jean-Louis | Carpentier, Anthony

Article Type: Research Article

Abstract: This paper provides a new expression of the magnetic co-energy for ferromagnetic materials. This expression is very well suited to integral methods but can as well be used as a post function for the Finite Elements Method (FEM). First the context of this work and the expression of the co-energy will be introduced. Second, two examples will be treated with the proposed method and the performances will be compared with the FEM.

Keywords: Volume integral method, magnetic co-energy, force computation, torque computation

DOI: 10.3233/JAE-171110

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 3-8, 2019

Authors: Badics, Zsolt | Bilicz, Sándor | Gyimóthy, Szabolcs | Pávó, József

Article Type: Research Article

Abstract: A nonlocal generalization of the IBC (impedance boundary condition) concept is introduced in this work for modeling the coil wires in resonant WPT (wireless power transfer) links. Such NLIBCs (nonlocal IBCs) can accurately account for the skin and proximity effects in the wires for all frequencies relevant to resonant WPT systems and can be utilized in both finite-element and surface-integral-equation numerical frameworks. The NLIBCs have run-time performance close to that of the IBC because the NLIBCs take advantage of the quasi-2D nature of the electromagnetic field inside the wires. The results for a typical WPT configuration illustrate the performance.

Keywords: Coil modeling, nonlocal impedance boundary condition, numerical modeling, wireless power transfer

DOI: 10.3233/JAE-171054

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 9-18, 2019

Authors: Marák, Károly | Pető, Tamás | Bilicz, Sándor | Gyimóthy, Szabolcs | Pávó, József

Article Type: Research Article

Abstract: Scattering from propellers is investigated using the 3D Finite Element Method (FEM), alongside a simpler integral equation (IE) method using 1D discretization. It is shown that under certain conditions and near the propellers’ resonant frequency, results using the two methods are in agreement, justifying the use of the IE method; this is advantageous because of smaller computation times, and for providing a physical insight to the scattering phenomena at hand. Anechoic chamber measurements are performed to validate the numerical results.

Keywords: Finite element method, method of moments, propeller, radar detection, unmanned aerial vehicle

DOI: 10.3233/JAE-171255

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 19-26, 2019

Authors: Zhang, Jian | Lu, Tiebing | Zhang, Weidong | Zhang, Xiuwu | Hu, Yifan

Article Type: Research Article

Abstract: Considering the structure of modular multilevel converter (MMC-HVDC) valve, the coupling path of electromagnetic interference is analyzed. In order to accurately predict the radio frequency interference (RFI) produced by MMC-HVDC converter, the 3D model of sub-module is established which is the basic unit of converters, and the RFI caused by sub-module is simulated. Furthermore, the electric fields in the valve hall are calculated by three models. Model I includes all components, such as shells, grading rings. Taking the influence of coupling path into account, two simplified models of MMC-HVDC converter RFI are proposed. Model II and model III are simplified …which take less calculating time and computer memory. Comparing the calculation results of simplified models with that of detailed model, the error analysis of electric field has been carried out. Show more

Keywords: MMC-HVDC, coupling path, RFI, sub-module, electric field

DOI: 10.3233/JAE-171230

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 27-37, 2019

Authors: Ma, Yuhan | Zheng, Taiying | Yang, Shiyou

Article Type: Research Article

Abstract: In order to quantitatively compute the magnetic field and current distributions in an Insulated Gate Bipolar Transistor (IGBT) considering the displacement currents and 3D eddy current neighboring effect to the lead in the fast switching-on and –off transients, a coupled distribute circuit-three dimensional (3D) finite element method (FEM) is developed, and its accuracy and merits are validated by comparing the numerical and tested results on a case study.

Keywords: IGBT, displacement current, 3D FEM

DOI: 10.3233/JAE-171184

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 39-46, 2019

Authors: Watanabe, Kota | Taiami, Yuki

Article Type: Research Article

Abstract: Fast liner solvers for shape optimization using a deflation technique are discussed. The optimization method based on evolutionary algorithms such as genetic algorithm requires huge computational cost to evaluate many trial shapes. In this reason, a deflated preconditioned conjugate gradient (PCG) method is introduced so as to reduce the cost of finite element analysis which is used to evaluate the objective function. The deflation technique decomposes the solution into fast and slowly components. The slowly components can be solved by direct methods with low computational cost due to small dimensions. Therefore, the deflated PCC method can improve the convergence. Thus, …the proposed method can reduce the computational cost. Numerical results show that the present method can improve the convergence and reduce the computational cost of optimizations of electromagnetic devices. Show more

Keywords: Deflation method, linear solver, optimization

DOI: 10.3233/JAE-171139

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 47-53, 2019

Authors: Yang, Wenjia | Ho, S.L. | Yang, Shiyou

Article Type: Research Article

Abstract: Wind driven optimization is a new entrant to evolutionary algorithms, and has been applied successfully to solve different engineering single objective (scalar) design problems. However, lukewarm efforts have been devoted to develop a vector optimizer using a wind driven optimization algorithm. This paper explores the potential of this new optimal method in solving multi-objective design problems in electromagnetics. In this regard, a vector wind driven optimization algorithm is proposed and validated using two inverse problems with promising numerical results.

Keywords: Wind driven optimization, multi-objective, evolutionary algorithm, design optimization

DOI: 10.3233/JAE-171186

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 55-62, 2019

Authors: Duca, Anton | Duca, Laurentiu | Ciuprina, Gabriela

Article Type: Research Article

Abstract: The paper proposes a new set of improved Quantum-behaved Particle Swarm Optimization (QPSO) algorithms by using the avoidance from the worst behaviour. The avoidance behaviour, which consist in introducing personal/local or global worst terms, are applied to the attractor’s formula. The enhanced QPSO algorithms are targeted towards benchmark electromagnetic optimization problems, and their efficiency is tested and tuned on Loney’s solenoid.

Keywords: PSO, QPSO, avoidance behaviour, optimization, electromagnetic field

DOI: 10.3233/JAE-171170

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 63-69, 2019

Authors: Zheng, Taiying | Yang, Shiyou | Bai, Yanan | Liu, Zhengrong

Article Type: Research Article

Abstract: To find the robust optimal solution of an engineering design problem under uncertainties, a novel robust optimization methodology is proposed. In the proposed methodology, the robust performances are treated as additional constraint functions, and the performance parameter is kept as the driving force to evolve the iteration procedures to find the exactly global robust optimal solution. An effective yet simple robust performance checking mechanism to check the robust performance constraints only to the potential robust “optimal” solutions to reduce the computational cost is introduced and its implemental procedure is developed. The proposed methodology can be used to search both the …robust and the global optimal solutions of an electromagnetic design problem. Finally, the proposed methodology is applied to solve a well defined inverse problem, and its performance is compared to that of an existing robust optimizer. Show more

Keywords: Robust optimization, uncertainty, design optimization, inverse problem

DOI: 10.3233/JAE-171168

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 71-78, 2019