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Wyszukujesz frazę "flux density" wg kryterium: Temat


Tytuł:
Magnetic field of complex helical conductors
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/141527.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Biot-Savart law
magnetic flux density
helical line
Opis:
Transmission of the electric power is accompanied with generation of low –frequency electromagnetic fields. Electromagnetic compatibility studies require that the fields from sources of electric power be well known. Unfortunately, many of these sources are not defined to the desired degree of accuracy. This applies e.g. to the case of the twisted-wire pair used in telephone communication; already practiced is twisting of insulated high-voltage three phase power cables and single-phase distribution cables as well. The paper presents a theoretical study of the calculation of magnetic fields in vicinity of conductors having helical structure. For the helical conductor with finite length the method is based on the Biot-Savart law. Since the lay-out of the cables is much more similar to a broken line than to strait line, in the paper the magnetic flux densities produced by helical conductor of complex geometry are also derived. The analytical formulas for calculating the 3D magnetic field can be used by a software tool to model the magnetic fields generated by e.g. twisted wires, helical coils, etc.
Źródło:
Archives of Electrical Engineering; 2013, 62, 4; 533-540
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chronovoltammetric determination of oxygen flux density in the soil
Autorzy:
Malicki, M.A.
Bieganowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/26357.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
oxygen diffusion
soil
amperometry
oxygen flux density
voltammetry
chronovoltammetry
Źródło:
International Agrophysics; 1999, 13, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault detection and diagnosis of squirrel cage asynchronous motor using a new COMSOL multiphysics software 6.0.
Autorzy:
Djaidir, Benrabeh
Nail, Bachir
Rouibah, Abdelkader
Powiązania:
https://bibliotekanauki.pl/articles/27313810.pdf
Data publikacji:
2024
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
asynchronous motor
comsol multiphysics
diagnosis
fault detection
flux density
Opis:
In this paper, the diagnosis of faults in squirrel cage asynchronous motor and experimental analysis process are presented. Currently there are several simulation tools, that lets users analyze and interpret the behavior of their devices. Based on this, there is a lot of researches that is working on developing models, to detect and classify 3-phase asynchronous motor faults, significantly in the early stages. This work proposed design and experimental analysis established in Comsol Multiphysics 6.0 , which implements finite element analysis software (FEM) for detecting and diagnosing broken bar rotors of this types motors and its practical application. In this case, the post processor of the COMSOL-Multiphysics makes it possible to visualize in 2D the various magnetic and mechanical quantities. Through the curves of the magnetic flux density and analysis distribution of the field with magnetic induction lines, we can draw some conclusions, where we proposed an strategy, for detecting and diagnosing faults consistent with the structure of the software.
Źródło:
Diagnostyka; 2024, 25, 1; art. no. 2024102
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method elaboration for determining heat losses within heat leakage bridges occurring in isothermal and cooling bodies
Autorzy:
Rochatka, T.
Powiązania:
https://bibliotekanauki.pl/articles/114272.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
heat leakage bridge
heat flux density
thermovision
isothermal body
Opis:
This paper presents the author’s method for the heat flux evaluation on the basis of a thermal photograph. This method is based on the comparison of surface temperatures of two areas where one of them is a thermally loaded with a known heat flux and the other control area which is not thermally loaded. With the method presented in the article analysing heat fluxes in places of high heat flux gradients occurring within heat leakage bridges, especially the service ones connected with the material humidity where heat flux density sensors can give substantial errors when the flux on the sensor surface is averaged.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 242-244
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda wyznaczania i analiza rozkładu indukcji magnetycznej w szczelinie powietrznej silnika indukcyjnego liniowego
Method for Determining and Analysis of the Experimental Air Gap Flux Density in Linear Induction Motor
Autorzy:
Kupiec, E.
Przyborowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1368645.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
indukcja magnetyczna
silnik indukcyjny liniowy
flux density
linear induction motor
Opis:
In this work a measurement system and method for calculating the spatial air gap field distribution in linear induction motor is presented. Way of recording the instantaneous air gap flux density distribution is described. Method of converting the measured signals to obtain the spatial air gap flux density distribution and spatial harmonics is presented. Based on the introduction of parametric variation of time in the form of chase angle, the animation of instantaneous air gap field distribution was generated.
W pracy przedstawiono system pomiarowy oraz metodę wyznaczania przestrzennego rozkładu indukcji w szczelinie silnika indukcyjnego liniowego. Opisano sposób rejestracji czasowo-przestrzennego rozkładu indukcji. Zaprezentowano metodę przekształcenia sygnałów pomiarowych i ich analizę w celu wyznaczenia przestrzennego rozkładu indukcji oraz wyznaczenia harmonicznych przestrzennych. Na podstawie wprowadzenia parametrycznej zmienności czasu w formie kąta fazowego dokonano wizualizacji pomierzonych sygnałów w formie animacji przebiegu czasowo-przestrzennego.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2013, 4, 100/2; 121-126
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research and Assessment of Safety Distance of TV Electromagnetic Fields
Autorzy:
Baltrenas, P.
Buckus, R.
Powiązania:
https://bibliotekanauki.pl/articles/89688.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
electric field strength
magnetic flux density
electromagnetic field
safety distance
Opis:
The evaluation covers the strengths of electric field and magnetic flux denstiy measured in frequency ranges of 5 Hz–2 kHz and 2–400 kHz of selected TV sets. The dependence of the electromagnetic field on the distance is addressed with reference to ergonomics and safety. Ten TV sets (5 tube and 5 LCD) were measured. There were 16 measurements for each one. The aim was to evaluate electric field and magnetic flux denstiy versus the distance from the tested device with regard to exposure levels. In addition, the distance and the strengths of electric field and magnetic flux denstiy emitted by tube and LCD TVs were compared. The results are presented in charts.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 1; 33-39
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental EMC aspects of resistance welding equipment
Autorzy:
Doebbelin, R.
Winkler, T.
Lindemann, A.
Powiązania:
https://bibliotekanauki.pl/articles/262729.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
resistance welding equipment
high output current
magnetic flux density
minimum distance
Opis:
Resulting from the connection between the change rate of a magnetic field and the induced currents in an exposed human body, pulsating magnetic fields have to be evaluated analysing the waveforms of the field or the field-generating current A corresponding assessment guideline is given in the German safety regulation on "Electromagnetic Fields" BGV Bll. Considering the specific output current waveforms of resistance welding installations, in the paper appropriate procedures to determine the waveform-dependent exposure limits are explained by the examples of an a.c. resistance welding machine and a resistance welding inverter. Based on investigations of the field distribution the occurring actual flux density values are compared to the ascertained exposure limits and a practical method to determine minimum distances ensuring compliance with the given regulations is shown.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 41-48
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effektivnost' infrakrasnykh vodjanykh otopitel'nykh panelejj
Water efficiency infrared heating panels
Autorzy:
Cherednik, A.
Redko, A.
Powiązania:
https://bibliotekanauki.pl/articles/76786.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
water management
radiant heating
flux density
air temperature
heat flow
experimental study
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 6
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation of the thermal characteristics of the refrigerants zeotropic mixtures condensation in minichannels
Autorzy:
Bohdal, T.
Sikora, M.
Widomska, K.
Powiązania:
https://bibliotekanauki.pl/articles/175244.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
condensation
heat transfer coefficient
mass flux density
minichannels
vapor quality
zeotropic mixture
Opis:
This paper describes the results of experimental investigations of heat transfer during the condensation of the homogenous R134a refrigerant and zeotropic mixtures R404A, R407C and R410A in pipe minichannels with internal diameters 0.31–3.30 mm. The values of the local and average heat transfer coefficient throughout the range of changes in the vapor quality 1–0 were determined. Based on the obtained results, the effect of vapor quality, mass flux density and channel diameter changes on heat transfer coefficient was illustrated. a pronounced effect of the refrigerant properties at the heat exchange efficiency during the condensation process in pipe minichannels was indicated. The results were compared with calculations according to the correlations proposed by other authors. On the basis of the experimental investigations, the authors proposed their own correlation for the calculation of local heat transfer coefficient, obtaining the results of compatibility tests in the range of ±20%.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 128; 43-57
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Repeatability of measurements of the potential oxygen flux density in the soil by the voltamperometric method
Autorzy:
Bieganowski, A
Powiązania:
https://bibliotekanauki.pl/articles/1401907.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil aeration
measurement
oxygen diffusion rate
soil
oxygen flux density
voltammetry
agrophysics
Opis:
Influence of the measuring procedure on the repeatability of measurement of the potential oxygen flux density in the soil has been presented. Five measuring procedures were applied: measurements taken one directly after another, reinstallation of the electrode after each measurement , reinstallation of the electrode after each measurement with a simultaneous mechanical cleaning of surfaces, measurements with 15-min breaks between consecutive measurements, measurements with electrochemical "cleaning" of the electrode surface.The OFD value was determined by a voltamperometric method using a tri-electrode measuring system. It was found out that the best repeatability can be obtained by repeating the measurement with 15-min (or longer) time intervals.
Źródło:
Acta Agrophysica; 2000, 35
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proba eliminacji elektrody porownawczej w woltamperometrycznej metodzie pomiaru gestosci strumienia tlenu [OFD]
Reference electrode elimination in the woltammetric measurement of the oxygen flux density
Autorzy:
Bieganowski, A
Malicki, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/1630395.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
gleby
gestosc strumienia tlenu
natlenienie
woltamperometria
soil
oxygen flux density
oxygenation
voltammetry
Opis:
Przedstawiono wyniki badań dotyczące pomiarów gęstości strumienia tlenu (OFD) w dwuelektrodowym symetrycznym układzie elektrod platynowych i stalowych. Krzywe woltamperometryczne uzyskane w różnie natlenionych roztworach wskazują na możliwość eliminacji elektrody porównawczej.
Results of measurements of the oxygen flux density (OFD) using symmetric two electrode (platinum or steel) system are presented.Current - voltage curves obtained in differently oxygenated solutions indicate possibility of elimination of reference electrode.
Źródło:
Acta Agrophysica; 1999, 22; 25-30
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The calculations of the efficency of the lightweight floor heating according to nordtest method NT VVS 127
Autorzy:
Werner-Juszczuk, Anna Justyna
Powiązania:
https://bibliotekanauki.pl/chapters/31233737.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
lightweight floor heating
standard
dry floor heating
heat flux density
surface temperature
Opis:
The suitability of Nordest Method NT VVS 127 for determining the operational parameters of the lightweight floor heating with a dry screed was tested. The methodology of surface temperature and heat flux density determination according to Nordest Method NT VVS 127 was presented. The calculations were made for lightweight floor heating with a dry screed of various thickness and variable water temperature. The results were compared with the numerical calculations made with ANSYS Steady-State Thermal Solver. The operational parameters of the floor heating were also determined using the method presented in PN-EN 1264 standard. The difference between the surface temperature determined according to Nordest Method NT VVS 127 and the numerical values does not exceed 5,68 K, for the heat flux density the error is up to 55,5%. The difference between the surface temperature determined according to PN-EN 1264 and the numerical value does not exceed 0,2 K, for the heat flux density the error is up to 8,5%. It was found, that the PN-EN 1264 standard is more applicable to determining the operational parameters of lightweight floor heating with a dry screed than Nordest Method NT VVS 127.
Źródło:
Innovations – Sustainability – Modernity – Openness. Modernity in engineering; 159-172
9788366391901
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis of linear induction motor under variable voltage variable frequency (VVVF) power supply
Autorzy:
Wakode, P. D.
Tariq, M.
Bhattacharya, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/136237.pdf
Data publikacji:
2016
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
Linear Induction Motor
Variable Voltage Variable Frequency
experimental
air gap flux density
Opis:
This paper presents the complete analysis of Linear Induction Motor (LIM) under VVVF. The complete variation of LIM air gap flux under ‘blocked Linor’ condition and starting force is analyzed and presented when LIM is given VVVF supply. The analysis of this data is important in further understanding of the equivalent circuit parameters of LIM and to study the magnetic circuit of LIM. The variation of these parameters is important to know the LIM response at different frequencies. The simulation and application of different control strategies such as vector control thus becomes quite easy to apply and understand motor’s response under such strategy of control.
Źródło:
Transactions on Environment and Electrical Engineering; 2016, 1, 2; 18-24
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a rotor with a starter-generator integrated into an aero car
Autorzy:
Wu, Zaixin
Yu, Ruiguang
Powiązania:
https://bibliotekanauki.pl/articles/141579.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aero motor
air-gap flux density
axial segmentation
electromagnetic and heat flux coupling
Halbach array structure
Opis:
The Halbach array structure rotor of the aero motor can satisfy the requirements of high power density and high air-gap flux for aeronautical motors. The size parameters of the rotor are determined by the power rating of the motor based on an analytic method. Producing a Halbach array structure is difficult. Comparison and analysis of the structure of the aero motor showthat the overall structure of the rotor adopts a three-axial-section classic Halbach-array hollow structure, and the rotor magnetic steel adopts a discrete structure of 4 blocks per pole and a single 45◦ magnetisation mode, which reduces the processing difficulty of the rotor magnetic steel. The finite element method was used to analyse the magnetic flux density distribution of the aeronautical motor under various working conditions. The results show that the motor can produce uniform air-gap flux density at various working conditions and present good sinusoidal periodicity. Furthermore, the axial segment did not produce obvious magnetic flux leakage. Finally, considering the eddy current loss of the stator under the rated power-generation condition with high-frequency magnetic field, we conducted coupling analysis of electromagnetic and heat flows to verify that the thermal characteristics of the rotor magnetic steel material could meet the requirements for the aero motor.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 357-371
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Flux Density of the Solar Radio Burst Event by Using Log Periodic Dipole Antenna (LPDA)
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412450.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
CALLISTO
Log Periodic Dipole Antenna (LPDA)
power flux density
solar radio burst
Opis:
In this article, an evaluation of the flux density of the solar radio burst is presented. A rod aluminium’s type as a conductor with nineteenth (19) elements of different sizes is being prepared to construct a log periodic dipole antenna (LPDA) from 45-870 MHz. The performance was carried out at the National Space Agency (PAN), Sg. Lang, Banting Selangor by connecting to the Compound Low Cost Low Frequency Spectroscopy Transportable Observatory (CALLISTO) spectrometer. The input impedance, R0 = 50 ohm is chosen for this LPDA antenna. From the analysis, the gain of the antenna is 9.3 dB. This antenna potentially captures a signal that covers about 0.08 m2 area of the Sun.The temperature of the burst that detected at the feedpoint of the antenna is 32 K. However, the signal becomes decrease to 28.75 K while by CALLISTO spectrometer as a receiver. It was also found that the isotropic source spectral power is 1576 W/Hz. Since the burst level above the background sky is 0.41 dB , the flux density of the burst is 5.5 x 10-21 W/m2/Hz. Based on the results, we conclude that this antenna is suitable for to observe the Sun activities at low frequency region.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 7; 21-29
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł

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