M. Repetto - Academia.edu (original) (raw)

Papers by M. Repetto

Research paper thumbnail of An accurate investigation on numerical methods for nonlinear magnetic field problems

Journal of Magnetism and Magnetic Materials, 1994

This paper investigates different iterative techniques (direct iteration, Newton-Raphson and fixe... more This paper investigates different iterative techniques (direct iteration, Newton-Raphson and fixed point methods) for the solution of nonlinear magnetic problems neglecting hysteresis. The investigations are carried out on a one-dimensional model problem whose exact nonlinear solution is computed when the magnetic flux is assigned. In spite of its simplicity, this model can present the same computational difficulties as most actual

Research paper thumbnail of 3-D magnetostatic with the finite formulation

IEEE Transactions on Magnetics, 2003

The paper presents the solution of a three-dimensional (3-D) magnetostatic problem using the fini... more The paper presents the solution of a three-dimensional (3-D) magnetostatic problem using the finite formulation of an electromagnetic field. Two different approaches, based on a primal-dual barycentric discretization of the 3-D space, are presented, considering as unknowns either the magnetic fluxes or the circulations of the vector potential. Results on simple reference configurations are reported and discussed.

Research paper thumbnail of Dual-PEEC Modeling of a Two-Port TEM Cell for VHF Applications

Two-port TEM cells with rectangular cross-section are commonly used to produce plane electromagne... more Two-port TEM cells with rectangular cross-section are commonly used to produce plane electromagnetic waves with high electric field. The non-uniform structure makes the use of numerical methods extremely useful in the design phase in order to achieve a very good behavior of the TEM cell over a wide frequency range of operation. In this paper an extended version of PEEC is used to study a real device and results are compared with experimental ones.

Research paper thumbnail of A multiquadrics-based algorithm for the acceleration of simulated annealing optimization procedures

... 3, MAY 1996 A Multiquadrics-based Algorithm for the Acceleration of Simulated Annealing Optim... more ... 3, MAY 1996 A Multiquadrics-based Algorithm for the Acceleration of Simulated Annealing Optimization Procedures P. Alotto*, A. Caili+, G ... Elettrica Industriale, Politecnico di Torino, 1-10129 Torino, Italy Abstract—A procedure to significantly reduce the computational cost of the ...

Research paper thumbnail of Computation and measurement of iron losses under PWM supply conditions

The paper presents a method for the estimation of the iron losses under PWM (Pulse Width Modulati... more The paper presents a method for the estimation of the iron losses under PWM (Pulse Width Modulation) flux supply conditions. The computational results are validated versus measurements on Epstein's yoke. The proposed model is based on Finite Element method formulated in the harmonic domain and takes into account ferromagnetic hysteresis and eddy currents. A classical Preisach model is used for

Research paper thumbnail of Thermo-Mechanical Analysis Using a Multiphysics Approach

In the paper the Cell Method, a discrete method for solving partial differential equations, is ap... more In the paper the Cell Method, a discrete method for solving partial differential equations, is applied to a time dependent thermo-mechanical problem. The basic equations are developed with a multiphysics approach and results, both in two-dimensional and tree- dimensional models, are presented. By means of the comparison with finite element approach, some advantages of the proposed methodology are highlighted, in particular quick model construction, capability to separate thermal strain from the mechanical one and, as a consequence, the capability to model the strain and stress evolution in a time dependent problem, considering possible mutual effects between thermal and mechanical fields.

Research paper thumbnail of Online optimizer for distribution networks on Neplan

2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC), 2015

The paper presents a software module, developed within the Neplan network analysis tool environme... more The paper presents a software module, developed within the Neplan network analysis tool environment, allowing a dialogue between the network simulator and external data. The tool is focused on the analysis of distribution networks and it has been used for two main aims: to keep the network model updated with data measured on the field (load values, status of switches etc.) and to couple the network simulator with an external topology optimizer. The procedure has been applied to the analysis of a distribution network owned by ATENA SpA in the Northern Italy town Vercelli. Plug-in working is explained and some preliminary results obtained are discussed.

Research paper thumbnail of An accurate investigation on numerical methods for nonlinear magnetic field problems

Journal of Magnetism and Magnetic Materials, 1994

This paper investigates different iterative techniques (direct iteration, Newton-Raphson and fixe... more This paper investigates different iterative techniques (direct iteration, Newton-Raphson and fixed point methods) for the solution of nonlinear magnetic problems neglecting hysteresis. The investigations are carried out on a one-dimensional model problem whose exact nonlinear solution is computed when the magnetic flux is assigned. In spite of its simplicity, this model can present the same computational difficulties as most actual

Research paper thumbnail of 3-D magnetostatic with the finite formulation

IEEE Transactions on Magnetics, 2003

The paper presents the solution of a three-dimensional (3-D) magnetostatic problem using the fini... more The paper presents the solution of a three-dimensional (3-D) magnetostatic problem using the finite formulation of an electromagnetic field. Two different approaches, based on a primal-dual barycentric discretization of the 3-D space, are presented, considering as unknowns either the magnetic fluxes or the circulations of the vector potential. Results on simple reference configurations are reported and discussed.

Research paper thumbnail of Dual-PEEC Modeling of a Two-Port TEM Cell for VHF Applications

Two-port TEM cells with rectangular cross-section are commonly used to produce plane electromagne... more Two-port TEM cells with rectangular cross-section are commonly used to produce plane electromagnetic waves with high electric field. The non-uniform structure makes the use of numerical methods extremely useful in the design phase in order to achieve a very good behavior of the TEM cell over a wide frequency range of operation. In this paper an extended version of PEEC is used to study a real device and results are compared with experimental ones.

Research paper thumbnail of A multiquadrics-based algorithm for the acceleration of simulated annealing optimization procedures

... 3, MAY 1996 A Multiquadrics-based Algorithm for the Acceleration of Simulated Annealing Optim... more ... 3, MAY 1996 A Multiquadrics-based Algorithm for the Acceleration of Simulated Annealing Optimization Procedures P. Alotto*, A. Caili+, G ... Elettrica Industriale, Politecnico di Torino, 1-10129 Torino, Italy Abstract—A procedure to significantly reduce the computational cost of the ...

Research paper thumbnail of Computation and measurement of iron losses under PWM supply conditions

The paper presents a method for the estimation of the iron losses under PWM (Pulse Width Modulati... more The paper presents a method for the estimation of the iron losses under PWM (Pulse Width Modulation) flux supply conditions. The computational results are validated versus measurements on Epstein's yoke. The proposed model is based on Finite Element method formulated in the harmonic domain and takes into account ferromagnetic hysteresis and eddy currents. A classical Preisach model is used for

Research paper thumbnail of Thermo-Mechanical Analysis Using a Multiphysics Approach

In the paper the Cell Method, a discrete method for solving partial differential equations, is ap... more In the paper the Cell Method, a discrete method for solving partial differential equations, is applied to a time dependent thermo-mechanical problem. The basic equations are developed with a multiphysics approach and results, both in two-dimensional and tree- dimensional models, are presented. By means of the comparison with finite element approach, some advantages of the proposed methodology are highlighted, in particular quick model construction, capability to separate thermal strain from the mechanical one and, as a consequence, the capability to model the strain and stress evolution in a time dependent problem, considering possible mutual effects between thermal and mechanical fields.

Research paper thumbnail of Online optimizer for distribution networks on Neplan

2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC), 2015

The paper presents a software module, developed within the Neplan network analysis tool environme... more The paper presents a software module, developed within the Neplan network analysis tool environment, allowing a dialogue between the network simulator and external data. The tool is focused on the analysis of distribution networks and it has been used for two main aims: to keep the network model updated with data measured on the field (load values, status of switches etc.) and to couple the network simulator with an external topology optimizer. The procedure has been applied to the analysis of a distribution network owned by ATENA SpA in the Northern Italy town Vercelli. Plug-in working is explained and some preliminary results obtained are discussed.