1,721,039 research outputs found
Theoretical and experimental investigation of impurity particle motion in solid-fluid insulating systems
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A user oriented modular package for the solution of general field problems under time varying conditions
No full textIn this paper a modular package, named COMPELL, for the solution of two-variable time-varying problems of the elliptic type is presented. The package allows the solution of standard magnetic problems, also under quasi-stationary or rapidly time-varying conditions, in the cases with nonlinear, anisotropic and nonhomogeneous materials with eddy currents, but can also face different problems, taking into account for instance the presence of moving bodies or the reciprocal interaction between magnetic fields, thermal fields and so on. The procedures used for field solution are generalized finite differences, least square finite differences, first presented in this paper, or finite elements. In the paper examples of magnetic field solutions are given, in particular by showing the field in a Tokamak structure accounting for the Hall effect. The data deck and the obtained results are displayed and the'main features of the package are discussed. © 1982 IEE
Application to eddy current problems of generalized versions of finite difference method
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Finite difference and finite element discretization procedures with improved continuity of interpolation functions
No full textA computer approach to the non linear hysteretic problem of electromagnetic field computation in hard superconductors for loss evaluation
No full textThe computation of the losses in superconducting wires requires the solution of electromagnetic problems with a complicated constitutive equation of the superconducting material, which is nonlinear with hysteresis, under time-varying conditions, Analytical and numerical procedures which can be found in the literature about this problem present a very limited application range and cannot be applied to cases of practical interest. In the paper a procedure is presented, by which most of the drawbacks are eliminated. The critical state model developed by Bean, Kim et a1 is used, in both the forms with constant critical current density and with critical current density function of the magnetic field. In this model the magnetic field penetrates the superconductor entering from the boundary by fronts. These fronts cannot reverse their velocity and represent interfaces with unknown geometric shapes. A package has been implemented to solve this problem, some example of field solution are given and the results are discussed. © 1982 IEE
The two-harmonic reluctance motor: an introduction to a new kind of variable-speed device
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