International Journal of Applied Electromagnetics and Mechanics - Volume 25, issue 1-4

Authors: Kažys, Rymantas | Mažeika, Liudas | Voleišis, Algirdas | Šliteris, Reimondas | Jasiuniene, Elena | Aït Abderrahim, Hamid | Dierckx, Marc

Article Type: Research Article

Abstract: In some nuclear reactors the core is intended to be cooled by means of liquid metal, for example, lead-bismuth eutectic alloy. For safety and licensing reasons, an imaging method of the interior of reactor has thus to be developed. The paper is devoted to development of ultrasonic imaging and measurement technique suitable for performance in the liquid Pb/Bi alloy.

Keywords: Ultrasonic imaging, nuclear reactors, high temperature, ultrasonic transducers

DOI: 10.3233/JAE-2007-876

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 249-256, 2007

Authors: Yamamoto, Yuko | Takami, Shohei | Ito, Satoshi | Yuki, Kazuhisa | Hashizume, Hidetoshi

Article Type: Research Article

Abstract: For realization of a commercial fusion power plant, the remountable HTS magnet was proposed as one of the technologies to reduce both construction and maintenance costs. The butt joint of HTS cable has been investigated for the concept. In this study, the joint performance is evaluated with changing joint area, normal stress and shear stress on the joint surface to investigate an optimum joint condition. The experimental results show that the joint performance is improved by …forming the optimum joint surface configuration where the normal stress becomes large while the shear stress is suppressed to be smaller than the normal stress. Show more

Keywords: Remountable HTS magnet, butt joint, normal stress, shear stress

DOI: 10.3233/JAE-2007-852

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 257-260, 2007

Authors: Kacprzak, Dariusz | Emeschajmer, Piotr | Tuleasca, Ioan | Ohji, Takahisa

Article Type: Research Article

Abstract: This paper reports a prototype of an inductive heating system designed for house-type dwellings. The aim of the system is to generate heat and transfer it to the house. The system produces heat using only electromagnetic field, which induces eddy currents in conductive elements. The conductive elements are placed in the way, which allows rapid heat transfer to the house. Therefore the system may be applied everywhere there the immediate heat effect is required. The principles …of operations, technical specification as well as the issues of the electromagnetic compatibility are presented. Show more

Keywords: Inductive, heating, eddy currents, electromagnetic compatibility

DOI: 10.3233/JAE-2007-867

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 261-265, 2007

Authors: Shimada, Kunio

Article Type: Research Article

Abstract: The flow and thermal characteristics in a parallel duct-type energy conversion device utilizing a magnetic fluid under a nonuniform magnetic field were analysed using theoretical equations from heat conduction suggesting a laminar developing flow. The theoretical results regarding pressure difference and temperature distribution were compared with experimental results. The present heat conduction model is capable of explaining the experimental data both quantitatively and qualitatively. Coincidence was found to be independent of the …performance of the applied magnetic field, which is an important factor in an energy conversion device. Show more

Keywords: Magnetic fluid, energy conversion device, heat conduction, magnetic field

DOI: 10.3233/JAE-2007-873

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 267-271, 2007

Authors: Cavaliere, Vincenzo | Cioffi, Marco | Formisano, Alessandro | Martone, Raffaele

Article Type: Research Article

Abstract: High performance superconducting generators design requires the use of efficient optimisation methodologies. A global strategy for the multi-objectives optimisation of such machines is here proposed: the algorithm is based on the Pareto optima concept and adopts the Particle Swarm Optimisation (PSO) approach. The optimal design model is here applied to a high temperature superconducting synchronous generator. The implementation of PSO scheme is shown to be well suited for Pareto design problems.

Keywords: High temperature superconductor, optimisation, particle swarm, Pareto Set, generators

DOI: 10.3233/JAE-2007-874

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 273-279, 2007

Authors: Takami, Shohei | Hashizume, Hidetoshi | Ito, Satoshi | Yamamoto, Yuko

Article Type: Research Article

Abstract: As a basic research for development of the remountable HTS magnet, experimental evaluation of the butt-jointing method with BSCCO 2223 HTS cable under the large joint stress is performed. In this experiment an optimum joint stress value, which makes joint resistance minimum, is obviously confirmed at each applied current value. In addition, numerical structural analysis is performed to clarify the stress distribution at the joint surface of HTS cable under the experimental condition. From these experimental …and numerical results, the efficient jointing condition is considered to reduce the joint resistance. Show more

Keywords: Remountable HTS magnet, BSCCO 2223, butt-jointing method, stress distribution analysis

DOI: 10.3233/JAE-2007-888

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 281-286, 2007

Authors: Hristoforou, Evangelos | Kosmas, Konstantinos

Article Type: Research Article

Abstract: In this paper, we summarize the magnetic and electromagnetic non-destructive testing techniques and devices based on the magnetostrictive delay line principle. Three main techniques are presented. The first is based on surface crack and defect detection on ferromagnetic surfaces by measuring the corresponding magnetic anomaly distribution. The second is the measurement of eddy currents generated around the cracks and defects on a magnetic or non-magnetic metallic surface. The third technique is measuring the surface …magnetic permeability of ferromagnetic substances. Finally, the methods of measuring the properties of magnetostrictive ribbons and cylinders used as MDLs, such as magnetoelastic performance and longitudinal sound velocity as well as their uniformity measurements are also discussed. Show more

Keywords: Magnetic non-destructive testing, magnetostrictive delay lines

DOI: 10.3233/JAE-2007-794

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 287-296, 2007

Authors: Joubert, Pierre-Yves | Diraison, Yohan Le | Pinassaud, Jean

Article Type: Research Article

Abstract: An integrated prototype of a new linear magneto-optical imager dedicated to real time inspection of large planar metallic structures is presented. The system provides images of the resulting normal magnetic field at the surface of the inspected structure, in amplitude and phase, in order to enable full defect characterization such as 3D image inversion. First raw images were obtained with an integrated linear magneto-optical imager, during the inspection of a flawed riveted lap joint mock-up similar …to actual aeronautical structures. Show more

Keywords: Non-destructive evaluation, real time imaging, magneto-optical imaging, eddy currents, defect detection and characterization, magneto-optical garnet, Faraday effect, riveted lap joints inspection

DOI: 10.3233/JAE-2007-831

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 297-305, 2007

Authors: Tamburrino, Antonello | Tian, Yong | Nair, Naveen | Udpa, Satish

Article Type: Research Article

Abstract: The time-of-flight (TOF), typically associated with wave propagation processes, can be extracted from physical processes governed by parabolic PDE's, such as those occurring in eddy current testing of conductive materials. The main "tool" for extracting the TOF is the Q-Transform, which is an integral transform capable of relating solutions of hyperbolic PDE's to solutions of parabolic PDE's. The extraction of TOF is considerably more complex when the specimen to be tested has material interfaces, as in …any realistic situation. Here we develop a technique capable of "removing" the effects due to known material interfaces. Show more

Keywords: Time-of-flight, Q-transform, eddy current testing, interface removal

DOI: 10.3233/JAE-2007-854

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 307-312, 2007

Authors: Reboud, Christophe | Prémel, Denis | Pichenot, Grégoire | Lesselier, Dominique | Bisiaux, Bernard

Article Type: Research Article

Abstract: A numerical model dedicated to the simulation of external eddy current testing (ECT) of tubes from the outer diameter surface has been developed. This paper is focused on the calculation of the primary electric field emitted by a tilted and off-centered encircling probe. Numerical difficulties are overcome by using splines functions for multivariate integration. Final simulation results obtained with the complete numerical model are compared to experimental data in the case of an off-centre probe in …conditions close to industrial ones. Show more

Keywords: Non-destructive testing, encircling probe, tilt and eccentricity, splines functions

DOI: 10.3233/JAE-2007-869

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 313-317, 2007