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

Authors: Iwatani, Yuu | Torii, Susumu

Article Type: Research Article

Abstract: In Japan, the electro dynamic suspension (EDS) has been studied. EDS using shorted coils, however, has the disadvantages that the pulsation of lift force occurs and the construction cost becomes high. In order to solve these defects, EDS having a conductive plate has been studied. These studies, however, assume that a plate is infinite. This paper presents the analysis of electromagnetic force of EDS having a finite conductor with quasi-three dimensional analysis.

Keywords: Magnetic levitation, electro-dynamic suspension, finite element method, eddy current, lift to drag ratio

DOI: 10.3233/JAE-2007-769

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 61-67, 2007

Authors: Cutrupi, Vincenzo | Formisano, Alessandro | Martone, Raffaele

Article Type: Research Article

Abstract: A numerical approach to the resolution of coupled electromagnetic-mechanical problems by means of a mesh-free formulation is here proposed. Possible discontinuities are treated by means of a jump function, and full advantages are taken of the capabilities of mesh-free methods in the treatment of deforming domains. In order to highlight the effectiveness of the proposed approach, two quasi-static electromagnetic-mechanical problems in a 1-D and a 2-D configuration are presented.

Keywords: Mesh-free methods (MM), coupled electromagnetic-mechanical problems

DOI: 10.3233/JAE-2007-866

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 69-76, 2007

Authors: Cieśla, Antoni

Article Type: Research Article

Abstract: Superconducting separators are a new generation of magnetic separators; a DC superconducting electromagnet may be used as a source of magnetic field. It creates, among other things, a chance to reject weak-magnetic particles – first of all extra small ones (the basic problem for beneficiation of useful minerals). The subject of the following considerations refers to the one from several possible constructions: a matrix high gradient separator equipped with the DC superconducting electromagnet. …Some practical aspects of the construction of the device in laboratory scale as well as the problems of exploitation conditions of the separator are presented. Show more

Keywords: DC superconducting magnet, magnetic separation, matrix high gradient separator

DOI: 10.3233/JAE-2007-824

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 77-81, 2007

Authors: Cieśla, Antoni

Article Type: Research Article

Abstract: Most likely, magnetic separation will be one of the first industrial areas impacted by high temperature superconductors (HTS) technology and may represent the future migration of magnetic separators to this technology. Design for a more detailed evaluation was chosen based on an iron magnetic circuit in which ampere-turns were supplied by a superconducting BSCC-Ag tape wound coil operating at 77 K. Two configurations for the separator were considered, a ball matrix separator and a wire matrix …high-gradient separator. Practical separations will be possible with such system. Show more

Keywords: High temperature superconductors, superconducting magnet, magnetic separation, matrix high gradient separator, magnetic circuit

DOI: 10.3233/JAE-2007-838

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 83-87, 2007

Authors: Wu, Yongbo | Tetsuka, Kenji | Kato, Masana | Shimada, Kunio | Wong, Yat Choy

Article Type: Research Article

Abstract: Magnetic polishing liquid (MPL), a mixture of MF (magnetic fluid), MRF (magnetorheological fluid), abrasive particles and cellulose, is a type of smart material proposed for surface finishing by the authors. Its fundamental performance in non-contact surface finishing was experimentally investigated with respect to the influences of the magnetic field strength and the gap between the working surface and the polishing pad surface on work surface quality indicators such as surface roughness and topography. The results showed …that a stronger magnetic field gives a better surface quality, and that an appropriate gap is important in increasing the polishing efficiency. Show more

Keywords: Magnetic fluid (MF), magnetorheological fluid (MRF), magnetic polishing liquid (MPL), surface finishing

DOI: 10.3233/JAE-2007-880

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 89-94, 2007

Authors: Sudo, Seiichi | Yano, Tetsuya | Okabe, Masayoshi | Komatsu, Takane

Article Type: Research Article

Abstract: Nobel type of micro magnetic fluid actuator is proposed. The micro actuator is composed of a small NdFeB magnet and kerosene-based magnetic fluid HC-50. Driving principle of the actuator is characterized by wireless operation with the alternating magnetic field. The actuator shows the metronomic motion. Frequency characteristics of the metronomic motion of the actuator are examined using a high speed video camera system.

Keywords: Micro actuator, magnetic fluid actuator, wireless energy supply system

DOI: 10.3233/JAE-2007-875

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 95-101, 2007

Authors: Dudek, Christophe | Duverger, Francois | Acher, Olivier

Article Type: Research Article

Abstract: Collections of magneto-mechanical oscillators are proposed as high permeability media. The permeability of these systems is investigated theoretically. It is shown that these systems are described by equations similar to that of gyromagnetism. The figures of merit of conventional soft permeable materials and of these magneto-mechanical systems are discussed.

Keywords: Magnetic permeability, magneto-mechanical systems, ferromagnetic resonance, soft magnetic materials

DOI: 10.3233/JAE-2007-861

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 103-108, 2007

Authors: Kanno, Hideto | Shimada, Kunio | Ogawa, Junji | Inoue, Norio

Article Type: Research Article

Abstract: Magnetorheological fluid dampers have been utilized in vibration control for buildings and mechanical structures. We have proposed a magnetic functional fluid that composed of micrometers size iron particles and 10 nanometers size magnetite particles in a solvent as an advanced MR fluid. In this paper, three kind of MR fluids consisting of different proportions of particles are investigated.

Keywords: Magnetic compounded fluid, Magnetorheological (MR) fluid, magnetic particles, hysteresis loop

DOI: 10.3233/JAE-2007-819

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 109-112, 2007

Authors: Shimada, Kunio

Article Type: Research Article

Abstract: We investigated the efficiency of a parallel duct-type energy conversion device utilizing a magnetic fluid under a nonuniform magnetic field using the results of heat conduction theory, the theoretical results taking the internal angular momentum into account, and a particle aggregation model. The experimental results can be investigated qualitatively and quantitatively. The efficiency varies according to the performance of the magnetic field distribution.

Keywords: Magnetic fluid, energy conversion device, aggregation, magnetic field

DOI: 10.3233/JAE-2007-833

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 113-117, 2007

Authors: Shimada, Kunio | Kanno, Hideto

Article Type: Research Article

Abstract: We experimentally investigated the dynamic characteristics of a viscous damper of passive damper type utilizing a newly proposed magnetically responsive fluid, MCF (magnetic compound fluid). We compared the characteristics regarding the damping and the response time of the damper's amplitude of MCF among those of MF and MR. The damping effect was also investigated as a viscous damping coefficient by employing a theoretical equation. MCF has the largest damping effect and the shortest response time. …This cause can be considered the particles aggregating in chain- or necklace-shaped clusters in the fluid, as observed via light microscope. Show more

Keywords: Magnetic compound fluid (MCF), magnetic fluid, magneto-rheological fluid, damper

DOI: 10.3233/JAE-2007-847

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 119-125, 2007