Gergely Friedl

55791536200

Publications - 5

A novel focus logic infused metaheuristic optimization approach based on swarm movement and human eye behavior

Miklós Kuczmann Gergely Friedl

Publication Name: 2022 IEEE 1st International Conference on Internet of Digital Reality Iod 2022

Publication Date: 2022-01-01

Volume: Unknown

Issue: Unknown

Page Range: 93-98

Description:

A novel global optimization method is described in this paper. The proposed metaheuristic approach is loosely based on the previously published technique, the Weighted Attraction Method. The main idea behind the proposed algorithm is the combination the local searching capabilities of the swarm movement-based metaheuristics and quasi-random global search. The quasi-random search technique applied is a novel concept, described as focus logic. The explosion step of the Weighted Attraction Method is modified in a way, that allows a wider area search preventing the algorithm to stuck at a local minimum point for multiple optimization cycles. The behavior of the proposed approach is similar, as the human eye observes its environment. It focuses on a specific area, while the peripheral vision is still giving information about the surrounding area. The proposed method can be applied to solve problems described by a continuous, moderately smooth objective functions rapidly. An objective function with such parameters can be found in any research field, from antenna design through model parameter identifications to Internet of Digital Reality (IoD) applications. In the first chapter the paper introduces the reader to the field of metaheuristic optimizations. The second chapter presents the detailed algorithmic structure of the proposed approach and describes the parameters that could be used to fine tune the behavior of the optimization process. The last technical chapter shows the performance of the proposed technique through comparing the convergence progress of multiple optimization methods on various test functions.

Open Access: Yes

DOI: 10.1109/IoD55468.2022.9986739

Recommendations on electromagnetic compatibility testing of unmanned aerial vehicles

Miklós Kuczmann Gergely Friedl Zsombor Petho Mate Liszi György Wersényi

Publication Name: 2022 IEEE 1st International Conference on Internet of Digital Reality Iod 2022

Publication Date: 2022-01-01

Volume: Unknown

Issue: Unknown

Page Range: 39-44

Description:

In this paper several recommendations and considerations on electromagnetic compatibility (EMC) testing of unmanned aerial vehicles (UAV, or drone) are presented. Currently, the standardization of drone EMC measurements is not yet fully established. These products are usually tested according to EN 55032, EN 55024, EN 64000-4-3 and EN 61000-4-8, while the scope of these standards is not UAV specific. The focus of this paper is on the testability of UAV emission and immunity from various aspects. The main goal of this paper is to initiate discussions regarding UAV specific conditions to describe measurement setups, conditions, and limitations suitable to drones. First, the UAV and the test environment shall be prepared from safety ant testability point of view. These aspects and recommended conditions - e.g., drone fastening, applying artificial load, and emulating the Earth's magnetic field - are explained in this paper. While the drones are assembled from CE certified components, the whole product requires a system level validation. The test conditions, limits, and stress levels shall be aligned to the specific environment an UAV might be exposed to. An initiative study aiming to describe the UAV exclusive electromagnetic conditions are also presented here. Additionally, several key aspects for EMC engineering of UAV's are also discussed in this paper, mainly focusing on functionality relevant EMC issues and solutions.

Open Access: Yes

DOI: 10.1109/IoD55468.2022.9987138

Edge finite element method in case of high frequency simulations

Miklós Kuczmann Gergely Friedl

Publication Name: Pollack Periodica

Publication Date: 2015-10-01

Volume: 10

Issue: 3

Page Range: 59-70

Description:

The paper deals with high frequency simulations with edge finite element method realized with PETSc functions. The weak formulations of the high frequency simulations are derived from Maxwell's equations in frequency domain. To reduce the calculation time, the finite element method was implemented in PETSc environment. The realized simulation environments were validated with simple examples, which analytically can be calculated.

Open Access: Yes

DOI: 10.1556/606.2015.10.3.7

Measurement and simulation of magnetic flux density, a comparative study

Miklós Kuczmann Gergely Friedl

Publication Name: Pollack Periodica

Publication Date: 2014-04-01

Volume: 9

Issue: 1

Page Range: 133-144

Description:

The paper presents a modified version of the T.E.A.M. Problem No. 32 of the Compumag Society. The original problem is a measurement arrangement to study the magnetic flux density distribution inside an EI ferrite core. A finite element simulation of the device in the frame of COMSOL Multiphysics using the A-formulation has been worked out. First, the device has been realized, and a LabVIEW program has been implemented to measure the waveform of the voltage of B-coils. The geometry and the solution of the problem have been implemented in the frame of COMSOL Multiphysics, to calculate magnetic flux density at the points, where B-coils are on the core.

Open Access: Yes

DOI: 10.1556/Pollack.9.2014.1.14

Application of PETSC and other useful packages in finite element simulation

Miklós Kuczmann Dániel Marcsa Gergely Kovács György Tomozi Péter Prukner Gergely Friedl Tamás Budai Tamás Unger

Publication Name: Pollack Periodica

Publication Date: 2013-08-01

Volume: 8

Issue: 2

Page Range: 141-148

Description:

In the frame of the project TÁMOP 4.2.2.A, at the Széchenyi István University, the goal is to work out a new finite element package for the simulation and optimization of permanent magnet synchronous motors. These motors are then used to drive new electric cars. The aim of the two dimensional package is the fast numerical modeling of these electric devices by the use of free tools presented in the paper. Of course, the software is aimed to use it in the simulation of other devices, and three dimensional problems, as well.

Open Access: Yes

DOI: 10.1556/Pollack.8.2013.2.15