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Wyświetlanie 1-15 z 765
Tytuł:
Anisotropy component of electromagnetic force and torque
Autorzy:
Spałek, D.
Powiązania:
https://bibliotekanauki.pl/articles/199912.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
anisotropy component
electromagnetic force
electromagnetic torque
Opis:
The paper deals with the problem of surface-integral representation of electromagnetic force/torque for magnetically anisotropic region. It is pointed out that in some anisotropic regions a component of electromagnetic force/torque appears - the so-called anisotropy component. The total electromagnetic field force/torque calculated with the help of Maxwell’s and Lorentz’s methods could lead to the different values for some anisotropic medium (homogeneous, without hysteresis). The coenergy method is used to evaluate total force/torque too. Analytical calculations of force/torque for isotropic and anisotropic media in electromagnetic field are presented. The condition for surface integral representation of Lorentz’s either force or torque is formulated.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 107-117
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of DC permanent magnet disc motor and improving its EMC
Autorzy:
Kovacova, I.
Kanuch, J.
Kovac, D.
Powiązania:
https://bibliotekanauki.pl/articles/262741.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electromagnetic compatibility
disc motor
electromagnetic field radiation
Opis:
The paper deals with construction design of DC permanent magnet disc motor by classical calculation method and its verifying by computer finite element simulation method. The paper deals also with the computer analysis of the electromagnetic compatibility (EMC) problems focused to the area of electrical machines, which can also disclose the startling facts concerning. A problem of interference between electric motor and surroundings space caused by electromagnetic field radiation is discussed too.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 23-39
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic friction clutch for fixing accurate position of sliding elements
Autorzy:
Doležel, I.
Kotlan, V.
Ulrych, B.
Powiązania:
https://bibliotekanauki.pl/articles/97636.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
friction clutch
electromagnetic clutch
electromagnetic friction clutch
Opis:
A complete mathematical model of an electromagnetic friction clutch is presented, whose numerical solution provides its basic operation characteristics. The clutch represents a part of various devices working with the movable plunger and its purpose is to fix it in a prescribed accurate position. Its application is illustrated by a typical example.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 1-11
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Profilaktyka zagrożeń elektromagnetycznych - symulacje komputerowe i badanie osłon ekranujących
Prevention of electromagnetic hazards - numerical simulations and an experimental study
Autorzy:
Zradziński, P.
Gryz, K.
Karpowicz, J.
Molenda, M.
Powiązania:
https://bibliotekanauki.pl/articles/179819.pdf
Data publikacji:
2003
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
promieniowanie elektromagnetyczne
osłony ekranujące
zagrożenia elektromagnetyczne
pole elektromagnetyczne
electromagnetic radiation
electromagnetic hazard
electromagnetic field
Opis:
Ekranowanie elektromagnetyczne jest jedną z bardziej skutecznych metod technicznych ograniczania zagrożeń elektromagnetycznych w środowisku pracy. W artykule omówiono metody ograniczania zagrożeń oraz zaprezentowano możliwości stosowania symulacji numerycznych, na przykładzie obliczeń i pomiarów parametrów prostych ekranów wykonanych z różnych materiałów. W podsumowaniu stwierdzono, że symulacje numeryczne mogą być wygodnym narzędziem doboru i projektowania właściwych rozwiązań osłon ekranujących.
Electromagnetic shielding is one of the more effective technical methods of reducing electromagnetic hazards in the working environment. Methods of hazards reduction are discussed and the possibility of using numerical simulations is presented, with sample calculations and measurements of characteristics of simple shields made from different materials. Numerical calculations can be a convenient tool for selecting and designing suitable shields.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2003, 10; 27-31
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self and mutual capacitance of conductors in air and lossy earth with application to electrified railways
Autorzy:
Mariscotti, Andrea
Powiązania:
https://bibliotekanauki.pl/articles/141754.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
capacitance
electromagnetic coupling
electrified rail systems
electromagnetic modeling
Opis:
The problem of a closed-form accurate determination of self and mutual capacitance of conductors in air and earth is considered: the application is the complete modeling of a railway line including buried conductors. The Generalized Potential Method (GPM) is presented and analyzed with regard to conditions of validity and solution methods. The accuracy of the GPM is evaluated solving some reference cases using the Complex Image Method and a commercial Finite Element Method simulator, comparing the model results with experimental data, and including the sensitivity on soil conductivity and permittivity, distance of conductors from the air–earth interface and frequency.
Źródło:
Archives of Electrical Engineering; 2019, 68, 4; 859-873
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic compatibility of smart installations
Autorzy:
Typańska, D.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/376224.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electromagnetic compatibility
intelligent building
electromagnetic disturbances
KNX
smart installations
Opis:
The paper presents the problem of protection of smart houses against electromagnetic disturbances. The technology associated with intelligent buildings was explained in detail. Attention was drawn to possibility of using specific technologies installed in different places. Electromagnetic disturbances that may affect the operation of sensitive electronic of intelligent building were characterized. The spread way of these disturbances and their methods of reduction were described.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 81; 95-100
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic coupling of the electrical drive – EMC. Part II
Autorzy:
Kováč, D.
Kováčová, I.
Powiązania:
https://bibliotekanauki.pl/articles/262681.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electrical electromagnetic compatibility
electromagnetic coupling
electrical systems
electrical drives
Opis:
The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC ) problem — the electromagnetic coupling applied in the field of power electrical systems as. The simulation analyses and practical measurements of the electromagnetic coupling are presented in part II . Obtained results confirm the correctness of the theoretical analyses and so they can be used for predictive stating of EMC quality of individual new electrotechnical products.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 89-94
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lorentz transformation of radiation 4-potential
Autorzy:
Comay, E.
Powiązania:
https://bibliotekanauki.pl/articles/1050861.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
covariance
4-potential
electromagnetic radiation
electromagnetic fields
Lorentz invariants
Opis:
The laws of Maxwellian electrodynamics are used in an analysis of the structure of the 4-potential of radiation fields. The paper examines multi-particle and single-particle effects of a radiating source. Causality of electromagnetic processes is an important element of the analysis. Covariance properties of the relevant variables are examined and the apparent non-covariance of the radiation 4-potential where A_{0}≡0 in all frames is explained. It turns out that the origin of this feature stems from the multi-charge properties of radiation. It is also shown how in every Lorentz frame one can use covariant properties of radiation fields and reconstruct an appropriate 4-potential.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1294-1298
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of electromagnetic waves on human reproduction
Autorzy:
Wdowiak, Artur
Mazurek, Paweł A.
Wdowiak, Anita
Bojar, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/989982.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
human reproduction
electromagnetic waves
infertility
exposure to electromagnetic fields
Opis:
Electromagnetic radiation (EMR) emitting from the natural environment, as well as from the use of industrial and everyday appliances, constantly influence the human body. The effect of this type of energy on living tissues may exert various effects on their functioning, although the mechanisms conditioning this phenomenon have not been fully explained. It may be expected that the interactions between electromagnetic radiation and the living organism would depend on the amount and parameters of the transmitted energy and type of tissue exposed. Electromagnetic waves exert an influence on human reproduction by affecting the male and female reproductive systems, the developing embryo, and subsequently, the foetus. Knowledge concerning this problem is still being expanded; however, all the conditionings of human reproduction still remain unknown. The study presents the current state of knowledge concerning the problem, based on the latest scientific reports.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dyrektywa dotycząca ekspozycji zawodowej na pola elektromagnetyczne - 2004/40/WE
Electromagnetic hazards in the European Union New directive concerning occupational exposure to electromagnetic fields – 2004/40/EC
Autorzy:
Karpowicz, J.
Gryz, K.
Powiązania:
https://bibliotekanauki.pl/articles/179821.pdf
Data publikacji:
2004
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
pole elektromagnetyczne
narażenie na pole elektromagnetyczne
zagrożenia elektromagnetyczne
electromagnetic field
exposure to electromagnetic field
electromagnetic hazards
Opis:
W maju 2004 r. opublikowano nową dyrektywę europejską dotyczącą minimalnych wymagań bezpieczeństwa w przypadku ekspozycji zawodowej na pola elektromagnetyczne - Directive 2004/40/EC of the European Parliament and of the Council on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (electromagnetic fields) (18th individual Directive within the meaning of Article 16(1) of Directive 89/391/EEC). W artykule omówiono zasady oceny ekspozycji pracowników wynikające z wymagań dyrektywy i porównano z zasadami określonymi w polskich przepisach bezpieczeństwa i higieny pracy odnoszących się do ekspozycji zawodowej na pola.
New European Directive was published in May 2004 – Directive 2004/40/EC of the European Parliament and of the Council on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (electromagnetic fields) (18th individual Directive within the meaning of Article 16(1) of Directive 89/391/EEC). The main rules for workers exposure assessment established by the Directive and comparison with Polish OSH regulations relevant to EMF are presented in paper.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2004, 11; 20-23
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of reducing common mode noise of conducted emission in a switching power converter considering parasitic effects
Autorzy:
Aswini, G. V.
Chenthurpandian, S.
Powiązania:
https://bibliotekanauki.pl/articles/27315702.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
conducted emission
radiated emission
electromagnetic interference
electromagnetic compatibility
EMI filter
Opis:
Most automotive electronic components can cause electromagnetic interference, that can cause power electronic circuits to become unstable. As per electromagnetic compatibility (EMC) standards, these electronic circuits should meet the specifications which are not achieved under some conditions. In this paper, the conducted emissions (CEs) are generated due to the switching of a buck converter, which often occurs in automotive electronics. The noise source was found to be due to the presence of common mode currents which largely affects the performance of EMC. Two types of filtering techniques were analysed and designed, and the results were compared to find an effective filtering solution to mitigate the effects of CE due to a common mode noise for the frequency range from 150 kHz to 108 MHz according to the International Special Committee on Radio Interference (CISPR25) standard. The capacitive and parasitic impedance were calculated and then used in the simulation. Finally, the simulated and measured results are presented. The noise level can be minimized by as much as 50 dB, which is an efficient noise reduction value.
Źródło:
Opto-Electronics Review; 2023, 31, 3; art. no. e147039
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic coupling of the electrical drive - EMC. Part I
Autorzy:
Kováčová, I.
Kováč, D.
Powiązania:
https://bibliotekanauki.pl/articles/262596.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electrical electromagnetic compatibility
EMC
electromagnetic coupling
electrical systems
electrical drives
Opis:
The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC) problem - the electromagnetic coupling applied in the field of power electrical systems. Theoretical analysis of above mentioned problem, based on the impact investigation of the electromagnetic wave propagation, is described in part I. Obtained results can be used for predictive stating of EMC quality of individual new electrotechnical products.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 9-15
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania kompatybilności elektromagnetycznej w świetle obowiązujących dokumentów normalizacyjnych
Electromagnetic compatibility testing in relation to existing standardization documents
Autorzy:
Musiał, S.
Kubiak, I.
Powiązania:
https://bibliotekanauki.pl/articles/209328.pdf
Data publikacji:
2009
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
kompatybilność elektromagnetyczna
normalizacja
zaburzenia elektromagnetyczne
electromagnetic compatibility
standardization
electromagnetic disturbances
Opis:
Obowiązujące obecnie dokumenty normalizacyjne odnoszące się do badań kompatybilności elektromagnetycznej, mimo ich znacznej liczby, można ze względu na pewne podobieństwa podzielić na dwie grupy: obowiązujące w przemyśle zbrojeniowym i cywilnym. Większość z nich zawiera jedynie odwołania do norm zasadniczych, w których to przedstawione są zarówno metody badań, jak i wymagania co do poziomów dopuszczalnych. W artykule zostały przedstawione podstawowe różnice pomiędzy tymi grupami dokumentów dotyczące zarówno metod pomiarowych, jak i dopuszczalnych poziomów. Do porównania i analizy przyjęto normy obronne NO-06-A200, NO-06-A500 oraz normę cywilną PN-EN 55022.
The paper presents basic differences between military, civilian and TEMPEST standardization documents, concerned with both the measurement methods and limits. Analysis and comparison were carried out on the basis of military standards (NO-06-A200 and NO-06-A500) and the civil standard PN EN 55022. The standard PN-EN 55022 "Information technology equipment. Radio disturbance characteristics. Limits and methods of measurement" includes both the test methods and acceptable levels. In spite of the fact that this standard applies to computer facilities, other standards refer to methods and limit showed in mentioned standard (for example PN-EN 55012 which concerns motor vehicles). The limits specified in the standard PN-EN 55022 are different and they depend on the device class (A and B), measuring distance, and detector type. Recommended distance equals 10 m or 30 m, whereas detector can be quasi - peek or average one. Standards NO-06-A200:2008 "Electromagnetic Compatibility. Limit levels of electromagnetic interferences and susceptibility" and NO-06-A500:2008 "Electromagnetic Compatibility. Test methods of electromagnetic interferences and susceptibility" contain test procedures and levels. These standards are based on the MIL-STD-461E. According to the standard NO-06-A500 there is required a distance of 1 m between EUT and received antenna (and only for that distance emission limits are contained in the standard NO-06-A200) using a peak detector. This standard recommends carrying out tests inside a shielded chamber. Shielded chamber must be equipped with absorption materials which parameters are not worse than specified in the standard. Moreover, this standard allows for measurements in echoic chamber and polygon tests (open area test site). In case of tests provided inside echoic chamber, the results could be distorted by reflections. Polygon tests are acceptable on the condition that the level of environmental disturbance is at least 6 dB below the limit. Limits presented in the standard vary considerably and depend on target place of installation of equipment (e.g. ships, aircraft ) and in case of conducted disturbances also on the levels of voltage and power. Such conditions have impact on the test frequency range. Dissimilar groups of documents are standards specified levels and test methods for equipment classified information processing. In accordance with these documents it is not important that emissions from devices exceed limits. Fundamental question is if emissions which exceed the limits are related to the information. To sum up: there are large variety of limits and tests which are connected with electromagnetic compatibility. Such a situation causes that choice of suitable standards for particular equipment is very difficult.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2009, 58, 4; 101-114
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analytical and Artificial Intelligence Methods to Investigate the Effects of Aperture Dimension Ratio on Electrical Shielding Effectiveness
Autorzy:
Basyigit, Ibrahim Bahadir
Dogan, Habib
Powiązania:
https://bibliotekanauki.pl/articles/226583.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromagnetic shielding
electromagnetic
compatibility
apertures
multilayer perceptron
radial basis
function networks
Opis:
This paper presents that the effect of single aperture size of metallic enclosure on electrical shielding effectiveness (ESE) at 0 – 1 GHz frequency range has been investigated by using both Robinson’s analytical formulation and artificial neural networks (ANN) methods that are multilayer perceptron (MLP) networks and a radial basis function neural network (RBFNN). All results including measurement have been compared each other in terms of aperture geometry of metallic enclosure. The geometry of single aperture varies from square to rectangular shape while the open area of aperture is fixed. It has been observed that network structure of MLP 3-40-1 in modeling with ANN modeled with fewer neurons in the sense of overlapping of faults and data and modeled accordingly. In contrast, the RBFNN 3-150-1 is the other detection that the network structure is modeled with more neurons and more. It can be seen from the same network-structured MLP and RBFNN that the MLP modeled better. In this paper, the impact of dimension of rectangular aperture on shielding performance by using RBFNN and MLP network model with ANN has been studied, as a novelty.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 359-365
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic launcher aviation gun of the future
Autorzy:
Adamski, M.
Skura, K.
Powiązania:
https://bibliotekanauki.pl/articles/246708.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
electromagnetic rail launcher
electromagnetic railgun
electromagnetic field
magnetic field
pulse source
missiles
rails system
compulsator
magnetic materials
Opis:
The electromagnetic rail launcher is a type of high-energy weapon that uses a strong magnetic field to project missiles. To create this field, a current pulse source is needed to provide sufficiently high voltages and currents. The study thoroughly examines the principle of electromagnetic operation of the rail launcher, with particular emphasis on how to achieve the highest electromagnetic field strength. The analysis has been subjected to the source of the impulse current and the tendency of their development in the near future. The subject of the appropriate rails selection and their mutual arrangement has been touched up to attain adequate strength against the harmful effects associated with the flow of high currents. Considerations have been taken to protect the rails from the harmful effects of large-scale current flows, and the topic of the projectile itself to the electromagnetic field was raised. The rapid development of technology over the last few years indicates that high-energy weapons will be the basic weapon of all types of forces in the near future. The development of electromagnetic railroads requires the solution of many mechanical problems and harmful phenomena.
Źródło:
Journal of KONES; 2017, 24, 4; 7-16
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 765

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