International Journal of Applied Electromagnetics and Mechanics - Volume 21, issue 1

Authors: Bahadir, A.R. | Abbasov, T.

Article Type: Research Article

Abstract: In this paper the change of the magnetohydrodynamic flow velocity of the infinite plate in the non stationary motion of the incompressible viscous liquid has been studied numerically. Outer magnetic field has been directed perpendicular to the plate and assumed moving with the plate. For the different dynamical motion of the plate, the evolution of the velocity has been investigated numerically. The magnetic field induction and the changing of the parameters of the dynamical system on …a large range effect to the velocity has been investigated. At a specific point increasing of the magnetic field induction causes decreasing in the velocity. By the increasing the parameters of the manyetohydrodinamic system, the problem becomes more difficult to solve analytically. Therefore, a numerical solution technique is resorted to solve the problem approximately. Show more

Keywords: magnetic liquid, flow velocity, magnetohydrodynamic, finite difference

DOI: 10.3233/JAE-2005-653

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 21, no. 1, pp. 1-10, 2005

Authors: Bosko, S.I. | Buchelnikov, V.D. | Taskaev, S.V. | Takagi, T. | Vasiliev, A.N.

Article Type: Research Article

Abstract: The kinetics of magnetic and structural domains and relaxation of magnetization and strain under an external stress and a magnetic field in ferromagnetic Ni-Mn-Ga alloys close to a structural phase transition on the basis of time-depending Ginzburg-Landau equation with a thermal noise were theoretically investigated. The influence of an external magnetic field on the kinetics of structural domains was established to have the same influence as the stress has but not so great. The evolution of …structural domain pictures was obtained. One type of structural domains was established to prevail in an alloy under an external stress or a magnetic field with time. The time dependencies of magnetization and strain were calculated. Show more

DOI: 10.3233/JAE-2005-300

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 21, no. 1, pp. 11-19, 2005

Authors: Costamagna, Eugenio | Di Barba, Paolo | Savini, Antonio

Article Type: Research Article

Abstract: Performance analysis and optimal design procedures are presented and discussed for a class of small permanent-magnet motors, with reference to a six-pole device with various tooth geometries. Numerical procedures based on robust algorithms for Schwarz-Christoffel transformations are used to obtain suitable 2D models of the device and to perform its shape optimization. The latter is cast as an inverse-transformation problem considering suitable geometrical features. The paper improves the analysis methodology already developed …by the authors and presents a new approach to optimal design leading to a fast computation. Show more

Keywords: Schwarz-Christoffel transformations, finite elements, optimal shape design, permanent-magnet motor

DOI: 10.3233/JAE-2005-667

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 21, no. 1, pp. 21-37, 2005

Authors: Zhou, Zhen-Gong | Sun, Jian-Liang | Wang, Biao

Article Type: Research Article

Abstract: In this paper, the behavior of two parallel symmetry permeable cracks in magneto-electro-elastic composites under anti-plane shear stress loading is studied by Schmidt method. By using the Fourier transform, the problem can be solved with a pair of dual integral equations in which the unknown variable is the jumps of the displacements across the crack surfaces. In solving the dual integral equations, the jumps of the displacements across the crack surface are expanded in a series …of Jacobi polynomials. Numerical examples are provided to show the effect of the length of the crack and the distance between two parallel cracks upon the stress, the electric displacement and the magnetic flux intensity factors of the cracks. The shielding effect of two parallel cracks is also obtained. From the results, it can be also obtained that the singular stress in piezoelectric/piezomagnetic materials carry the same forms as those in a general elastic material for anti-plane shear problem. Show more

Keywords: magneto-electro-elastic composites, parallel cracks, dual integral equations

DOI: 10.3233/JAE-2005-668

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 21, no. 1, pp. 39-48, 2005

Article Type: Correction

Abstract: Erratum to International Journal of Applied Electromagnetics and Mechanics 20(1)2004, 1–9

DOI: 10.3233/JAE-2005-669

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 21, no. 1, pp. 49-50, 2005