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Start Over Author "Specogna, Ruben" Journal ieee transactions on magnetics
162 results on '"Specogna, Ruben"'

3. Error Fields’ Computation in the RFX-mod2 Reversed Field Pinch

Author

Bettini, Paolo, primary, Marrelli, Lionello, additional, Voltolina, Dimitri, additional, Cavazzana, Roberto, additional, Marchiori, Giuseppe, additional, Marconato, Nicolo, additional, Specogna, Ruben, additional, Spizzo, Gianluca, additional, Torchio, Riccardo, additional, and Zanca, Paolo, additional

Published
2021
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6. Constitutive matrices using hexahedra in a discrete approach for eddy currents

Author

Dular, Patrick, Specogna, Ruben, and Trevisan, Francesco

Subjects
Eddy currents (Electric) -- Analysis, Geometry -- Usage, Matrices -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

We examine the construction of reluctivity and Ohm's constitutive matrices for discrete geometric approaches using nonregular hexahedra as primal volumes. The effect of element deformation on the representation of uniform fields have been investigated for static fields. Then convergence and accuracy of the proposed matrices has been carried out using an eddy-current problem as working example. Index Terms--Constitutive matrices, discrete geometric approaches, eddy-currents.

Published
2008

7. Eddy-currents computation with T-[OMEGA] discrete geometric formulation for an NDE problem

Author

Specogna, Ruben and Trevisan, Francesco

Subjects
Eddy currents (Electric) -- Analysis, Geometry -- Usage, Reinforcing bars -- Electric properties, Reinforcing bars -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Abstract

We propose a discrete geometric formulation based on a magnetic scalar potential and on the circulation of an electric vector potential to solve eddy-current problems for nondestructive evaluation of steel bars with longitudinal defects. Index Terms--Discrete formulations, eddy-currents, nondestructive evaluations.

Published
2008

8. Reinterpretation of the Nodal Force Method within discrete geometric approaches

Author

Henrotte, Francois, Specogna, Ruben, and Trevisan, Francesco

Subjects
Geometry -- Usage, Magnetostatics -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

We propose a geometric reinterpretation of the Nodal Force Method in the framework of a pair of discrete formulations for magnetostatics on complementary meshes. Index Terms--Discrete approaches, forces, magnetostatics.

Published
2008

9. Symmetric positive-definite constitutive matrices for discrete eddy-current problems

Author

Codecasa, Lorenzo, Specogna, Ruben, and Trevisan, Francesco

Subjects
Eddy currents (Electric) -- Research, Matrices -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

We examine the construction of a symmetric positive definite conductance matrix for eddy-current problems, using a discrete approach. We construct a new set of piecewise uniform basis vector functions on both the primal and the dual complex. We define these vector functions for both tetrahedra and prisms. Index Terms--Cell method, constitutive matrices, discrete approaches, eddy currents.

Published
2007

10. Discrete constitutive equations in A-X geometric eddy-current formulation

Author

Specogna, Ruben and Trevisan, Francesco

Subjects
Ohm's law -- Research, Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Using a geometric formulation for eddy currents, we present a geometric approach to constructing approximations of the discrete magnetic and Ohm's constitutive matrices. In the case of Ohm's matrix, we also show how to make it symmetric. We compared the impact on the solution of the proposed Ohm's matrices, and an iterative technique to obtain a consistent right-hand-side term in the final system is described. Index Terms--Cell complexes, cell method, constitutive matrices, eddy currents.

Published
2005

50. Complementary Discrete Geometric $h$ -Field Formulation for Wave Propagation Problems.

Author

Cicuttin, Matteo, Codecasa, Lorenzo, Specogna, Ruben, and Trevisan, Francesco

Subjects
ELECTROMAGNETIC wave propagation, DISCRETE systems, GEOMETRIC analysis, FIELD theory (Physics), MAXWELL equations, MATHEMATICAL bounds, SAMPLING errors, EDDY currents (Electric)
Abstract

An electromagnetic wave propagation problem can be formulated according to a pair of complementary formulations, called the e -formulation and the h -formulation. The two formulations are linked to each other by Maxwell’s curl equations, and, in the continuous setting, they are perfectly equivalent in describing the wave propagation phenomenon. However, this is not true in the discrete setting, where the two formulations, in general, give different solutions. In the past decades, complementary formulations were widely studied for static problems and eddy-current problems, where they were exploited as error estimators for adaptive refinement schemes. Moreover, the so-called bilateral energy bounds arise for some problems whether theoretically or at least numerically. However, to the best of our knowledge, little attention has been given to complementarity in the wave propagation problems. In this paper, we propose an adaptive refinement scheme using the constitutive error as an estimator, and then, we investigate the behavior in terms of bilateral energy bounds. [ABSTRACT FROM AUTHOR]

Published
2016
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