International Journal of Applied Electromagnetics and Mechanics - Volume 30, issue 3-4

Article Type: Editorial

Abstract: Preface to the Selected papers of the 10th International Workshop on Optimization and Inverse Problems in Electromagnetism (OIPE 2008) special issue.

DOI: 10.3233/JAE-2009-1015

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 125-126, 2009

Authors: Di Barba, P. | May, H. | Mognaschi, M.E. | Palka, R. | Savini, A.

Article Type: Research Article

Abstract: The paper deals with the design optimization of high temperature superconducting magnetic bearings (SMB). The described algorithm allows a~multiobjective optimal design with respect to the geometries of the gap oriented excitation arrangement as well as the superconducting bulks.

Keywords: Superconducting magnetic bearing, multiobjective optimization, finite element

DOI: 10.3233/JAE-2009-1016

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 127-134, 2009

Authors: Cranganu-Cretu, Bogdan | Jaindl, Michael | Köstinger, Alice | Magele, Christian | Renhart, Werner | Smajic, Jasmin

Article Type: Research Article

Abstract: Magnetic shielding and shunting in industrial devices is crucial for keeping stray losses and hot-spot appearances as low as possible. Nevertheless, the additional costs for magnetic shunts and conductive shields have to be taken into account. Therefore, an optimal trade-off between a remarkable reduction of the stray losses and the design and position of the shielding devices has to be found. A higher order evolution strategy is applied to perform this task. The relevant objectives are …merged into a single number by applying a fuzzy membership function to each objective, respectively. These membership functions can be implemented as static ones or in a way, that they adjust themselves dynamically during the optimization process. In general multi-objective problems show a number of local solutions besides the global one and it is worth to investigate as many of the local solutions as possible as well. Therefore, a most desirable behaviour would be if the optimization strategy behaves globally and yields additional information about local minima detected on the way to the global solution. This goal can be achieved by clustering the population prior to the recombination process and by performing the recombination in a cluster sensitive way. Show more

Keywords: Multi-objective optimization, multi-modal optimization, stochastic optimization, shielding devices

DOI: 10.3233/JAE-2009-1017

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 135-149, 2009

Authors: Akli, C.R. | Sareni, B. | Roboam, X. | Jeunesse, A.

Article Type: Research Article

Abstract: In this paper, the Integrated Optimal Design (IOD) approach for energetic system design is discussed. IOD aims at concurrently optimizing the architecture, the element sizing and the energy management in an energetic system. IOD leads to complex optimization problems (typically mixed variable problems with several constraints and multiple objectives) which can be solved with direct optimization methods. We illustrate the interest of this approach through the design of a hybrid environmentally friendly locomotive moved by …four DC motors supplied by a diesel engine generator in association with electric storage elements (batteries and ultracapacitors). Show more

Keywords: Integrated optimal design, multidisciplinary design optimization, hybrid locomotive, ecodesign

DOI: 10.3233/JAE-2009-1018

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 151-162, 2009

Authors: Kreuawan, S. | Moussouni, F. | Gillon, F. | Brisset, S. | Brochet, P. | Nicod, L.

Article Type: Research Article

Abstract: In this paper, traction system design in carried out with a multilevel optimization technique called Target Cascading. This methodology is based on a hierarchical breaking down and allows solving a problem with multiple parallel optimizations. The large-scale system design problem is usually decomposed into several linked optimization subproblems according to project organization structure. Target Cascading gives a new approach to formulate and to solve the complex system design optimization problem in the …electrical field. The problem formulation is more suitable to this kind of problem than conventional methods because it is closer to a work organisation of design engineers. Show more

Keywords: Traction system, complex system, multilevel optimization, target cascading, and design optimization

DOI: 10.3233/JAE-2009-1019

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 163-178, 2009

Authors: Pigot, Ch. | Delinchant, B. | Poulin, G. | Reyne, G.

Article Type: Research Article

Abstract: Scale reduction improves the amplitude of diamagnetism. Thus diamagnetic levitation is possible at the microscale with simple micromagnets. The present work aims at comparing the performances of this levitation at the microscale with other well established technologies. A device including a levitating magnet in a diamagnetic box is optimized in order to fulfil the requirements of three different markets in the acceleration sensing field. It is shown that this technology fulfils the requirements for medium range …and short time response markets. However, the use of small proof mass limits the resolution of high precision sensors. Show more

Keywords: Diamagnetic levitation, microaccelerometer, market specification, micromagnet, semi-analytical modeling, optimization

DOI: 10.3233/JAE-2009-1020

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 179-188, 2009

Authors: Delinchant, B. | Rakotoarison, H.L. | Ardon, V. | Chadebec, O. | Cugat, O.

Article Type: Research Article

Abstract: This paper deals with electromagnetic modeling dedicated to constrained optimization needs. A tool dedicated to magnetic devices with simple shapes is presented and applied to the design of magnetic MEMS. This tool allows semi-numerical modeling and provides symbolic gradient computation. A multi-level optimization strategy is used to ensure fast and global convergence of magnetic latch micro device.

Keywords: Optimization, gradient, sensitivity, multi-level, magnetic, MEMS

DOI: 10.3233/JAE-2009-1021

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 189-200, 2009

Authors: Wein, Fabian | Kaltenbacher, Manfred | Bänsch, Eberhard | Leugering, Günter | Schury, Fabian

Article Type: Research Article

Abstract: We present the topology optimization of an assembly consisting of a piezoelectric layer attached to a plate with support. The optimization domain is the piezoelectric layer. Using the SIMP (Solid Isotropic Material with Penalization) method with forced vibrations by harmonic electrical excitation, we achieve a maximization of the dynamic displacement. We show that the considered objective function can be used under certain boundary conditions to optimize the sound radiation. The vibrational patterns resulting from the …optimization are analysed in comparison with the modes from an eigenvalue analysis. Multiple-frequency optimization is achieved by adaptive weighted sums. As a second optimization criterion, a flat frequency response is integrated in the optimization process. Show more

Keywords: Topology optimization, piezoelectric coupling, sound radiation

DOI: 10.3233/JAE-2009-1022

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 201-221, 2009

Authors: Besri, A. | Delinchant, B. | Keradec, J.P. | Sullivan, C.R

Article Type: Research Article

Abstract: For high frequency switch-mode power converters and supplies, planar transformers allow good performances to be reached. They suit very well to embedded power electronics applications, where size and weight matter. This paper presents a modeling, simulation, and sizing tool based on a 1D analytical model. This tool aims at helping designers describe, simulate, and know frequency behavior of planar wound components. As soon as all measurable impedances given as the tool outputs, device behavior becomes predictable. …Due to its analytical nature, this tool is very fast and it can be driven by optimization software to reduce transformer losses and, finally, reduce cooling system weight. Show more

Keywords: 1D analytical modeling, planar transformers, simulation, optimization, topologies

DOI: 10.3233/JAE-2009-1023

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 223-236, 2009

Authors: Foggia, G. | Ha Pham, T.T. | Warkozek, G. | Wurtz, F.

Article Type: Research Article

Abstract: Neural networks algorithms are tested to replace an optimization module, for the energy management of a residential grid-connected PV system with storage. Multi-layer perceptrons are generic tools able to map non-linear relationships between inputs and outputs without knowing any information about the system model. This study shows multiple problems of the implementation of these techniques, despite their theoretical promising interests.

Keywords: Energy management, neural networks, optimization, multi-layer perceptron

DOI: 10.3233/JAE-2009-1024

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 30, no. 3-4, pp. 237-244, 2009