Search results for: Oszkar Biro

Items from 1 to 20 out of 46 results

article

Comparison of 2 methods for the finite element steady‐state analysis of nonlinear 3D periodic eddy‐current problems using the A,V− formulation

Rene Plasser, Yasuhito Takahashi, Gergely Koczka, Oszkar Bíró

International Journal of Numerical Modelling: Electronic Networks, Devices... > 31 > 2 > n/a - n/a

Two different techniques for the analysis of nonlinear, periodic eddy‐current problems are compared using a three‐dimensional benchmark problem. The methods are the parallel time periodic finite element method and the time periodic fixed‐point technique.

article

PEEC-Based Multi-Objective Synthesis of Non-Uniformly Spaced Linear Antenna Arrays

Thomas Bauernfeind, Paul Baumgartner, Oszkar Biro, Christian A. Magele, more

IEEE Transactions on Magnetics > 2017 > 53 > 6 > 1 - 4

Linear antenna arrays consisting of dipole antennas find wide applications in wireless communication systems. Typically, arrangements with uniform spacing between the array elements are applied to gain highly directive radiation patterns while controlling the radiation intensity in the side lobes. To describe such arrangements, the so-called pattern multiplication (PM) technique is frequently applied,...

article

UHF RFID Antenna Impedance Characterization: Numerical Simulation of Interconnection Effects on the Antenna Impedance

Thomas Bauernfeind, Werner Renhart, Piergiorgio Alotto, Oszkar Biro

IEEE Transactions on Magnetics > 2017 > 53 > 6 > 1 - 4

A major design criterion of wireless communication devices is the matching between the impedance of the analog frontend and the input impedance of the antenna structure. Especially for passive communication systems, the matching is essential to ensure good performance. Numerical design tools are typically utilized in the antenna design process to determine the antenna impedance. Additionally, measurements...

article

Interactive Toolbox for the Visualization of Typical Antenna Attributes

Paul Baumgartner, Thomas Bauernfeind, Kurt Preis, Oszkar Biro

IEEE Transactions on Magnetics > 2017 > 53 > 6 > 1 - 4

To understand wave propagation phenomena, complex mathematical and physical theory is needed. Therefore, many undergraduate students find it very difficult to deal with this area of research. In this paper, an interactive toolbox is proposed which can help students to gain profounder knowledge and understanding of wave propagation effects. Great importance was attached to the design of a very simple...

article

FEM-Based Computation of Circuit Parameters for Testing Fast Transients for EMC Problems

Susanne Bauer, Werner Renhart, Oszkar Biro

IEEE Transactions on Magnetics > 2017 > 53 > 6 > 1 - 4

To test the immunity of an electronic devices against electrical fast transient pulses, the standardized electromagnetic compatibility measurement setup of the capacitive coupling clamp has been utilized. This paper outlines the extraction of circuit parameters with finite elements for this standardized setup. The obtained circuit parameters can be used for time saving simulations with quite common...

chapter

UHF RFID antenna impedance characterization: Numerical simulation of interconnection effects on the antenna impedance

Thomas Bauernfeind, Werner Renhart, Piergiorgio Alotto, Oszkar Biro

2016 IEEE Conference on Electromagnetic Field Computation (CEFC) > 1

2016 IEEE Conference on Electromagnetic Field Computation (CEFC)

To obtain the antenna impedance of antennas designed for UHF RFID applications by means of measurements, vector network analyzers are commonly applied. Such measurement devices are unbalanced by nature. In the present paper the influence of the needed test fixture and interconnection structures on the antenna impedance is investigated in terms of numerical field simulations.

chapter

PEEC-based multi-objective synthesis of non-uniformly spaced linear antenna arrays

Thomas Bauernfeind, Paul Baumgartner, Oszkar Biro, Christian Magele, more

2016 IEEE Conference on Electromagnetic Field Computation (CEFC) > 1

2016 IEEE Conference on Electromagnetic Field Computation (CEFC)

Linear antenna arrays consisting of dipole antennas find wide applications in wireless communication systems. Typically, arrangements with uniform spacing between the array elements are applied to gain highly directive radiation patterns. In the present paper an antenna array arrangement with non-uniformly spacing between the array elements is synthesized in the multi-objective sense. The optimization...

chapter

Convergence investigation of finite element fixed-point techniques applied to 3D nonlinear periodic eddy current problems involving voltage-driven coils

Rene Plasser, Gergely Koczka, Oszkar Biro

2016 IEEE Conference on Electromagnetic Field Computation (CEFC) > 1

2016 IEEE Conference on Electromagnetic Field Computation (CEFC)

Two algorithms for the implementation of fixed-point techniques applied to the solution of three-dimensional nonlinear periodic eddy current problems with voltage excited coils are compared with respect to their convergence properties. The difference is in the treatment of the equations of the voltage constraint during the fixed-point iterations. The investigations are carried out on a transformer...

chapter

FEM-based Computation of circuit parameters for testing fast transients for EMC problems

Susanne Bauer, Werner Renhart, Oszkar Biro

2016 IEEE Conference on Electromagnetic Field Computation (CEFC) > 1

2016 IEEE Conference on Electromagnetic Field Computation (CEFC)

This contribution outlines the extraction of circuit parameters with 3D finite elements from the standardized electromagnetic compatibility (EMC) measurement setup of the capacitive coupling clamp that is utilized for immunity tests against fast transients.

chapter

Interactive toolbox for the visualization of typical antenna attributes

Paul Baumgartner, Thomas Bauernfeind, Kurt Preis, Oszkar Biro

2016 IEEE Conference on Electromagnetic Field Computation (CEFC) > 1

2016 IEEE Conference on Electromagnetic Field Computation (CEFC)

To understand wave propagation phenomena complex mathematical and physical theory is needed. Therefore, many undergraduate students find it very difficult to deal with this area of research. In the present paper an interactive toolbox is proposed which can help students to gain profounder knowledge and understanding of wave propagation effects.

chapter

Comparison of two formulations taking account of 3D motion induced eddy currents

Gebhard J. Wallinger, Oszkar Biro

2016 IEEE Conference on Electromagnetic Field Computation (CEFC) > 1

2016 IEEE Conference on Electromagnetic Field Computation (CEFC)

Two formulations to take account of eddy currents involving the simulation of rotating conductors are examined. The method based on the Minkowski transformation is used as reference for a non-conforming mesh method based on interpolation techniques. As an example, the two formulations are applied to a problem involving a coil rotating inside a conducting cylinder.

chapter

Limitations of the pattern multiplication technique for uniformly spaced linear antenna arrays

Paul Baumgartner, Thomas Bauernfeind, Werner Renhart, Oszkar Biro, more

2016 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications (CoBCom) > 1 - 7

2016 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications (CoBCom)

Linear antenna arrays find wide applications in wireless communication systems. Typically, arrangements with uniform spacing between the array elements are applied to gain highly directive radiation patterns. Although the numerical capabilities of modern computing infrastructures allow the numerical analysis of complex modern antenna array configurations the so called pattern multiplication technique...

chapter

Torque Ripple Reduction Using Evolution Optimization Method and Varying Supply Voltage

Andrej Stermecki, Peter Kitak, Igor Tičar, Oszkar Biró, more

Studies in Computational Intelligence > Intelligent Computer Techniques in Applied Electromagnetics > Applications of Computer Methods > 249-257

The purpose of this research was to reach torque ripple minimization using a relatively inexpensive manufacturing method – shifting of the rotor’s permanent magnets and varying supply voltage. In the performed analyses, the differential evolution optimization method combined with FEM analysis was used to find the optimal shifting angles of the magnetic poles. Furthermore the procedure of varied supply...

article

3-D FE Method Analysis of Static Fields for Non-Conforming Meshes With Second-Order Node-Based Elements

Gebhard J. Wallinger, Oszkar Biro

IEEE Transactions on Magnetics > 2016 > 52 > 3 > 1 - 4

A novel approach of using node-based, second-order polynomial shape functions to substitute the degrees of freedom corresponding to slave nodes by a linear combination of those corresponding to master nodes is shown to be a powerful and accurate tool to couple non-conforming meshes. This method is investigated and proposed to be used to consider moving domains, especially rotating parts. The numerical...

article

Computation and Analysis of DC-Biased Eddy Current Problems by an Efficient Fixed-Point Technique in the Harmonic Domain

Xiaojun Zhao, Yuting Zhong, Oszkar Biro, Lin Li, more

IEEE Transactions on Magnetics > 2015 > 51 > 11 > 1 - 4

A new method to optimally determine the fixed-point reluctivity is presented to ensure the stable and fast convergence of harmonic solutions. The diagonal fixed-point reluctivity matrix decouples the harmonic solutions and significantly reduces the memory requirement in computation. The nonlinear eddy current problem under dc-biased magnetization is computed by the fixed-point harmonic-balanced finite-element...

chapter

Investigations on ground compensation coils and their influence on the field distribution of electrically short loop antennas

Thomas Bauernfeind, Werner Renhart, Oszkar Biro

2015 13th International Conference on Telecommunications (ConTEL) > 1 - 5

2015 13th International Conference on Telecommunications (ConTEL)

Electrically small loop antennas are balanced devices by nature. Quite often such antennas are directly connected to a coaxial feed line e.g. the ISO/IEC 10373 test PCD antenna. The direct connection of such an antenna to the coaxial feed line leads to a mode conversion at the antenna terminals. In the present paper the influence of this mode conversion on the field distribution of an electrically...

article

Anisotropic Generalization of Vector Preisach Hysteresis Models for Nonoriented Steels

Paul Handgruber, Andrej Stermecki, Oszkar Biro, Viktor Gorican, more

IEEE Transactions on Magnetics > 2015 > 51 > 3 > 1 - 4

A Preisach-type vector hysteresis model is developed to represent anisotropic material characteristics under static and dynamic conditions. Bi- and uniaxial anisotropy are incorporated by generalizing the input projection of the vector model. Frequency-dependent eddy current and excess effects are considered by an additional field strength component. The model is applied to simulate the magnetic properties...

article

Analysis of Temperature Distribution in the Stator of Large Synchronous Machines Considering Heat Conduction and Heat Convection

Maximilian Schrittwieser, Oszkar Biro, Ernst Farnleitner, Gebhard Kastner

IEEE Transactions on Magnetics > 2015 > 51 > 3 > 1 - 4

The aim of this paper is the characterization of the convective heat transfer and its treatment in a 3-D model to calculate the heat transfer and related temperature distribution in large synchronous machines. The wall heat transfer coefficients in the ventilation ducts have been correlated to various design parameters by several computational fluid dynamics simulations and have been defined at the...

article

Finite Element Simulation of Impedance Measurement Effects of NFC Antennas

Thomas Bauernfeind, Kurt Preis, Werner Renhart, Oszkar Biro, more

IEEE Transactions on Magnetics > 2015 > 51 > 3 > 1 - 4

In this paper, the problem of connecting the unbalanced measurement setup on the balanced antenna of the near-field communication (NFC) system is addressed. The parameters of the antenna’s equivalent circuit were determined using quasi-static and full-wave vector field finite element simulations. Measurements and simulations are carried out on three different prototypes of 13.56 MHz NFC rectangular...

article

A Transient Current Vector Potential to Consider the Rotor Excitation of Synchronous Machines Under Short Circuit Condition

Stefan Riegler, Oszkar Biro, Gebhard Wallinger

IEEE Transactions on Magnetics > 2015 > 51 > 3 > 1 - 4

This paper presents a method to approximately take account of the rotor excitation field of a synchronous machine under maximum aperiodic short-circuit condition using an impressed current vector potential in a 3-D transient finite-element analysis. The method is applied to compute end-region phenomena like end-winding forces or eddy current losses in conducting machine parts where the effects of...

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Search results for: Oszkar Biro

Comparison of 2 methods for the finite element steady‐state analysis of nonlinear 3D periodic eddy‐current problems using the A,V− formulation

PEEC-Based Multi-Objective Synthesis of Non-Uniformly Spaced Linear Antenna Arrays

UHF RFID Antenna Impedance Characterization: Numerical Simulation of Interconnection Effects on the Antenna Impedance

Interactive Toolbox for the Visualization of Typical Antenna Attributes

FEM-Based Computation of Circuit Parameters for Testing Fast Transients for EMC Problems

UHF RFID antenna impedance characterization: Numerical simulation of interconnection effects on the antenna impedance

PEEC-based multi-objective synthesis of non-uniformly spaced linear antenna arrays

Convergence investigation of finite element fixed-point techniques applied to 3D nonlinear periodic eddy current problems involving voltage-driven coils

FEM-based Computation of circuit parameters for testing fast transients for EMC problems

Interactive toolbox for the visualization of typical antenna attributes

Comparison of two formulations taking account of 3D motion induced eddy currents

Limitations of the pattern multiplication technique for uniformly spaced linear antenna arrays

Torque Ripple Reduction Using Evolution Optimization Method and Varying Supply Voltage

3-D FE Method Analysis of Static Fields for Non-Conforming Meshes With Second-Order Node-Based Elements

Computation and Analysis of DC-Biased Eddy Current Problems by an Efficient Fixed-Point Technique in the Harmonic Domain

Investigations on ground compensation coils and their influence on the field distribution of electrically short loop antennas

Anisotropic Generalization of Vector Preisach Hysteresis Models for Nonoriented Steels

Analysis of Temperature Distribution in the Stator of Large Synchronous Machines Considering Heat Conduction and Heat Convection

Finite Element Simulation of Impedance Measurement Effects of NFC Antennas

A Transient Current Vector Potential to Consider the Rotor Excitation of Synchronous Machines Under Short Circuit Condition

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