MODELLING AND CALCULATING THE SHIELDING EFFECTIVENESS OF BUILDING MATERIALS

Author:

Ján Zbojovský, Technical University of Košice (Letna 9,042 00 Košice, Slovak Republic)

Pavol Liptai, Technical University of Košice (Letna 9,042 00 Košice, Slovak Republic)

Marek Moravec, Technical University of Košice (Letna 9,042 00 Košice, Slovak Republic)

Language: english

Annotation:

Urgency of the research. Everyone is affected by electromagnetic radiation and radio frequency radiation from all appliances. Electromagnetic field causes invisible threats to our health. Prolonged exposure to electromagnetic radiation causes physiological change in human. It is therefore important to focus on the protection of human against exposure of electromagnetic radiation. One of the ways to protect or minimize electromagnetic radiation is shielding and the ways how to improve the shielding.

Target setting. The main target is to investigate the shielding properties of the building materials and the ways how to improve shielding effectiveness of these materials.

Actual scientific researches and issues analysis. In recent studies of the shielding of electromagnetic fields, some references and their modifications are proposed.

Uninvestigatigated parts of general matters defining. In this topic is presented just partial research. In spite of that a lot of results where published, still it isn’t the end of research. In the future the target of research is to investigate the shielding of electromagnetic field, with wider frequency range, and with various building and other materials which can be used as an appropriate shielding material for various equipments.

The research objective. Aim of the paper is the distribution of the electromagnetic field in frequency range from 1.5 to 5.0 GHz, penetrating through the building materials and combination of materials.

The statement of basic materials. The electromagnetic field is characterized as a physical field in which the electric and magnetic forces operate in the space. Modeling of electromagnetic fields around electrical equipment and in each part of these devices are now an important part of the development and analysis which are important to the quality of equipment with regard to electromagnetic compatibility. These analyzes are performed by computational programs. Simulations, in the high frequency structural simulator program Ansys are performed.

Conclusions. The aim of this paper was to determine the shielding effectiveness of glass, brick and combinations of some materials. This was achieved by simulation of electromagnetic field. Generally, shielding effectiveness of building materials is very low. If we want to increase the shielding effectiveness it is appropriate to combine the materials with some conductive material.

Key words:

electromagnetic field, propagation, shielding, Ansys

References:

1. IEEE Guide--Adoption of IEC/TR 61000-3-7:2008, „Electromagnetic compatibility (EMC)--Limits--Assessment of emission limits for the connection of fluctuating installations to MV, HV and EHV power systems“ IEEE Std 1453.1-2012 (Adoption of IEC/TR 61000-3-7:2008), 78 p., 2012, E-ISBN: 978-0-7381-7285-9J.

2. P. Vecchia, et al. “Exposure to high frequency electromagnetic fields, biological effects and health consequences (100kHz to 300GHz)”, INCIRP 16/2009.

3. R YOSHINO, Y., SHOTA, I., MICHIHIKO, K., MASAO, T., Assessment of human exposure to electromagnetic field from an intra-body communication device using intermediate-frequency electric field, International Symposium on Electromagnetic Compatibility (EMC EUROPE), 2012, 17-21.9.2012, Rome, s. 1-4.

4. B. Dolník, Electromagnetic compatibility. (Elektromagnetická kompatibilita). TU of Košice, dec. 2013, monography.

5. Vaimann, T.; Belahcen, A.; Kallaste, A. (2014). Changing of magnetic flux density distribution in a squirrel-cage induction motor with broken rotor bars. Electronics and Electrical Engineering, 20 (7), pp. 11–14.

6. M.S. Zhdanova, I.M.Varentsov, et al.: “Methods for modelling electromagnetic fields – Results from COMMEMI—the international project on the comparison of modelling methods for electromagnetic induction” Journal of Applied Geophysics, 1997, 133–271 s.

7. M. Pavlik, M. Lison, P. Kurimsky, Measuring of electromagnetic field shielding in the frequency range from 1 GHz to 9 GHz for windows in: Elektroenergetika 2015. - Košice : TU, 2015, s. 560-563.

Download