International Journal of Applied Electromagnetics and Mechanics - Volume 19, issue 1-4

Authors: Oshinoya, Yasuo | Arai, Hajime | Ishibashi, Kazuhisa

Article Type: Research Article

Abstract: To improve riding comfort of driver's seat, we have proposed active suspension system for heavy duty truck. In this study, the control mechanism of the active seat suspension was designed for a small vehicle such as community car with using the optimal control method. The operability improvement for senior citizens, the vibration isolation for babies and the riding comfort improvement on the unpaved road can be expected. In order to examine the effectiveness of the system, …experiments were performed. Show more

Keywords: active seat suspension, riding comfort, community car, electric vehicle, feedback control, feedforward link

DOI: 10.3233/JAE-2004-605

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 437-443, 2004

Authors: Heutling, B. | Reimche, W. | Krys, A. | Grube, L. | Stock, M. | Bach, Fr.-W. | Kroos, J. | Stolzenberg, M. | Westkämper, G.

Article Type: Research Article

Abstract: The online-measurement of mechanical-technological characteristic values is made necessary by the need of the steel plants to control the quality of steel sheets continuously during its production under rough industrial environmental conditions. In this paper it is shown that continuous online measurements based solely on the data of the harmonic analysis of eddy current signals are well established by now. The presented online measuring system provides reliable mechanical-technological characteristic values showing clearly …changes of the material which are caused e.g. by variations of the furnace temperature or degree of skin-passing or levelling. Show more

DOI: 10.3233/JAE-2004-606

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 445-451, 2004

Authors: Oliveri, Maria E. | Coco, Salvatore | Gazzo, Daniela S.M. | Giuffrida, Cinzia | Laudani, Antonino

Article Type: Research Article

Abstract: An iterative procedure is presented for the accurate design of the Helmholtz coils generating ELF magnetic fields used for the exposure of biological samples of different sizes. In this procedure, starting from an assigned magnetic field profile, local and global inverse problems are iteratively solved in sequence until a target precision in the obtained magnetic field profile is achieved. At this point the coil geometrical parameters and the associated current source intensities are available for the …design. Show more

Keywords: inverse problems, optimization, Helmholtz coils

DOI: 10.3233/JAE-2004-607

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 453-456, 2004

Authors: Čápová, Klára | Čáp, Ivo | Blazek, Vladimir

Article Type: Research Article

Abstract: The paper deals with modelling and simulation of a human brain arterial system using analogous electromagnetic systems, especially propagation characteristics of electric transmission lines. Cascade connection of analogous equivalent transmission line elements represents a vessel tree concerning both the electromagnetic parameters and the topology. Electromechanical analogy between physiological and electromagnetic values enables a description and following simulation of a cerebral haemodynamics by means of electric circuits analogous relations. The vascular dynamics modelling …and simulation represents an important tool for the non-invasive computer-aided investigation of the brain arteries pathological deformations. The presented simulation results give the information about the blood dynamic characteristics also in the case of cerebral arterial stenoses or aneurysms under various stenosis degrees. The obtained results can provide helpful knowledge for the practical treatment of the basic brain arteries. Show more

Keywords: electromechanical analogy, modelling and simulation, dynamic fluid systems, haemodynamics, equivalent electromagnetic system, transmission line propagation characteristics

DOI: 10.3233/JAE-2004-608

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 457-462, 2004

Authors: Xuan, L. | Shanker, B. | Zeng, Z. | Udpa, L.

Article Type: Research Article

Abstract: Compared with the conventional finite element method that relies on an underlying mesh and element-node connectivity to describe the geometry, meshless method shows its advantage in mesh simplification, tight crack representation and re-meshing process. An effective numerical implementation of the meshless method uses the Galerkin technique and is referred to as the element-free Galerkin (EFG) method. In this paper, the EFG method is applied to a field of electromagnetic computation, namely, simulation of pulsed eddy …current testing. The model is validated against analytical solutions. Show more

Keywords: Element-free Galerkin method, pulsed eddy current, finite element method, nondestructive testing

DOI: 10.3233/JAE-2004-609

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 463-466, 2004

Authors: Ito, Satoshi | Hashizume, Hidetoshi | Yamauchi, Takeshi

Article Type: Research Article

Abstract: For a future design of fusion power plant, concept of remountable SC magnet is proposed to improve cost performance. In this concept butt jointing of HT_C SC is used as jointing method and contact force can be obtained from electromagnetic force induced by self magnetic field of the magnet. Evaluation of performance of butt jointing with laminated SC tapes is performed to demonstrate feasibility of the remountable SC magnet experimentally. The result shows that …the jointing resistance is almost in inversely proportional to the contact area and dependent on transport current. Numerical analysis is carried out to explicate the resistance dependence. The numerical results, however, shows difference from the experimental one. Further, evaluation of electromagnetic force is carried out to prove that the contact stress can be obtained only by electromagnetic force. Show more

Keywords: remountable SC magnet, HT_C SC tape, butt jointing

DOI: 10.3233/JAE-2004-610

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 467-472, 2004

Authors: Hirsinger, Laurent

Article Type: Research Article

Abstract: A predictive model of field-induced strain in Ni-Mn-Ga ferromagnetic shape memory alloys is proposed. In this study, magnetocrystalline anisotropy K_1 is introduced to permit magnetisation rotation in each martensitic platelets. The demagnetisation field induced by the shape of platelet microstructure is investigated. As expected, the strain -induced by magnetic field- in a single crystal is mainly given by the mobility of twin boundaries, by the crystal anisotropy of martensite and by the shape anisotropy …of platelet microstructure. Show more

Keywords: magneto-mechanical coupling, shape memory alloy, model

DOI: 10.3233/JAE-2004-611

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 473-477, 2004

Authors: Guenneau, S. | Geuzaine, C. | Nicolet, A. | Movchan, A.B. | Zolla, F.

Article Type: Research Article

Abstract: The propagation of electromagnetic waves in three-dimensional periodic structures is studied here using the finite (edge) element method. The use of the Floquet-Bloch theory leads to special boundary conditions. In the quasi-static limit, we obtain the effective properties for a periodic array of dielectric spheres and compare these numerical results with two other homogenization approaches, namely Clausius-Mossotti theory and two-scale method.

Keywords: bloch conditions, homogenization, photonic crystals

DOI: 10.3233/JAE-2004-612

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 479-483, 2004

Authors: Suzuki, Takaaki | Matsumoto, Eiji

Article Type: Research Article

Abstract: The magnetic and the mechanical constitutive equations are proposed on the basis of the continuum theory of magnetoelastic materials. The rate type expression is derived from the moving Preisach model by taking into account the stress dependence as the magnetic constitutive equation. From the symmetry of the constitutive equations, it is shown that the stress magnetization effect can be derived from the stress-dependent magnetization and magnetostriction curves. It is experimentally confirmed that the constitutive equations can …describe typical magnetoelastic behaviors of a ferromagnetic material such as the magnetization and the magnetostriction curves under the stress and the stress magnetization curve. Show more

Keywords: ferromagnetic material, magnetoelastic coupling, constitutive equation

DOI: 10.3233/JAE-2004-613

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 485-489, 2004

Authors: Yokoo, Koichiro | Oshinoya, Yasuo | Ishibashi, Kazuhisa | Marunaga, Kazuo

Article Type: Research Article

Abstract: This paper describes how to simulate magnetic levitation of a thin steel plate by using electromagnets. Since the levitation system is essentially unstable, the plate is levitated by controlling the attractive magnetic force produced by the electromagnets with feedback signals: the displacement and velocity of the plate and the current of the electromagnet. As the magnetic force is the same regardless of the current direction, a bias voltage is necessary for supplying an initial current to …the electromagnet. The motion equation of the plate is solved by the finite difference method. The magnetic force is obtained by using the finite element method. In this paper, we study how to improve the control performance, which becomes better by adding a current feedback and adjusting the bias voltage. Show more

Keywords: magnetic levitation control, computer simulation, finite difference method, nonlinear control

DOI: 10.3233/JAE-2004-614

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 491-496, 2004