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Wyświetlanie 1-15 z 82
Tytuł:
Comparative analysis of LLC resonant and quasi resonant converter for photo voltaic emulator
Autorzy:
Iqbal, M. T.
Tariq, M.
Powiązania:
https://bibliotekanauki.pl/articles/1396956.pdf
Data publikacji:
2016
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
buck converter
LLC Resonant Converter
quasi resonant converter
photovoltaic emulator
Simulink
Opis:
The paper presents a comparative analysis of the two resonant based converter topologies. The converter topologies selected are LLC resonant converter and the Quasi resonant converter. The modeling, analysis and control of both the converter is done and presented here for the case of the photovoltaic (PV) emulator. A PV emulator is basically a DC-DC converter having same electrical characteristics that of solar PV panel. The emulator helps to achieve real characteristics of PV system in a better way in an environment where using actual PV systems can produce inconsistent results due to variation in weather conditions. The complete system is modelled in MATLAB® Simulink SimPowerSystem software package. The Simulation results obtained from the MATLAB® Simulink SimPowerSystem software package for both topologies under steady and dynamic conditions are analyzed and presented. An evaluation table is also presented at the end of the paper, presenting the effectiveness of each topology.
Źródło:
Transactions on Environment and Electrical Engineering; 2016, 1, 2; 1-5
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Breathing Biofeedback Training for Stress Reduction Among Manufacturing Operators
Autorzy:
Sutarto, A. P.
Wahab, M. N. A.
Zin, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/89747.pdf
Data publikacji:
2012
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
stress
resonant breathing
biofeedback
operators
Opis:
The aim of this study was to examine the effect of resonant breathing biofeedback training for reducing stress among manufacturing operators. Resonant breathing biofeedback works by teaching people to recognize their involuntary heart rate variability and to control patterns of this physiological response. Thirty-six female operators from an electronic manufacturing factory were randomly assigned as the experimental group (n = 19) and the control group (n = 17). The participants of the intervention received 5 weekly sessions of biofeedback training. Physiological stress profiles and self-perceived depression, anxiety, and stress scale (DASS) were assessed at pre- and post-intervention. Results indicated that depression, anxiety, and stress significantly decreased after the training in the experimental group; they were supported by a significant increase in physiological measures. Overall, these results support the potential application of resonant biofeedback training to reduce negative emotional symptoms among industrial workers.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2012, 18, 4; 549-561
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-phase soft-switching inverter with coupled inductors, experimental results
Autorzy:
Karyś, S.
Powiązania:
https://bibliotekanauki.pl/articles/200045.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
soft-switching
resonant inverter
ZVS inverter
Opis:
This paper presents experimental results of the three-phase soft-switching inverter with coupled inductors that verify the control method influence on efficiency improvement. Different kinds of control methods were tested on the 6 kW experimental inverter. A short discussion on a few design methods of the resonant tank elements was made. Experimental results confirm that the advanced control algorithm and the proposed new design method of the resonant tank elements significantly increase the efficiency of this resonant inverter.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 535-540
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral Properties of Circular Piezoelectric Unimorphs
Autorzy:
Pustka, M.
Půst, L.
Powiązania:
https://bibliotekanauki.pl/articles/176831.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
piezoelectric unimorph
natural vibrations
resonant frequency
mode shape
Opis:
The piezoelectric unimorphs are essential resonant components of many oscillating systems including electroacoustic devices. The unimorph spectral properties are namely dependent on geometric dimensions, applied materials and mounting. Preliminary dimensioning and optimization of unimorph shape are usually carried out prior to comprehensive design work mostly based on finite element method. Simple analytical model is a suitable tool for initial design phase. This paper presents a derivation of calculation model describing natural vibrations of a circular unimorph with the piezoelectric layer diameter smaller than the elastic layer diameter. The system of equations with closed-form solution is instrumental to calculation of resonant frequencies and mode shapes for unimorphs with clamped, simply supported and free circumference. The theoretical results are compared with vibration velocity measurement of clamped unimorph sample in a wide frequency range. Analytical model derived in this paper is used to assess the effect of the thickness tolerance on unimorph resonant frequencies.
Źródło:
Archives of Acoustics; 2017, 42, 4; 743-751
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiresonant ZVS boost converter
Autorzy:
Szychta, E.
Powiązania:
https://bibliotekanauki.pl/articles/262727.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
multiresonant converter
zero voltage switching
ZVS
resonant circuits
Opis:
The article presents properties ofmultiresonant voltage-increasing converter to be ! applied in DC voltage supply systems. The configuration of the system elements enables application ! of the technique of zero voltage switching (ZVS) of semi-conductor elements, which yields high operating frequencies of the system while maintaining high energy efficiency and reliability of operation. Results of simulation tests of the converter, based on Simplorer, are discussed. Regulation characteristics are presented and the converter's efficiency is determined.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 65-71
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Push-pull resonant DC-DC isolated converter
Autorzy:
Jalbrzykowski, S.
Citko, T.
Powiązania:
https://bibliotekanauki.pl/articles/200421.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
push-pull
DC-DC resonant converter
soft switching
Opis:
A new concept of a DC-DC converter with galvanic isolation is proposed in this paper. The converter belongs to the class E resonant converters controlled by pulse width modulation via frequency regulation (PWM FM). Due to the possibility of operation in the boost and buck modes, the converter is characterized by a high range of voltage gain regulation. The principle of converter operation described by mathematical equations is presented. The theoretical investigations are confirmed by p-spice model simulations and the measurement of an experimental model of 1kW laboratory prototype.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 763-769
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A predictive estimation based control strategy for a quasi-resonant dc-link inverter
Autorzy:
Turzyński, M.
Banach, P.
Murawski, P.
Pepliński, R.
Chrzan, P. J.
Powiązania:
https://bibliotekanauki.pl/articles/200484.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resonant converters
ZVS three-phase inverter
current estimation
Opis:
Control of parallel quasi resonant dc link inverters (PQRDCLI) is usually based on dc link input inverter current. Instead of a direct measurement of this noise sensitive and fast changing current signal - its estimation with one step prediction may be considered. Estimation of an input inverter current is based on inverter output current measurements, applied in most of power electronics controlled ac drives. In this paper, the PQRDCLI fed induction motor (IM) with a predictive current estimation stabilizes resonant inverter output voltage slopes du/dt independently of load. By control of output voltage derivatives, reduction of overvoltage spikes and common mode motor currents is achieved. An analysis of the PQRDCLI control with a predictive current estimation strategy is verified by the Saber system simulation and experimental tests in a laboratory setup.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 757-762
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System do badań nieniszczących warystorów metodą rezonansowej spektroskopii ultradźwiękowej
System for non-destructive testing of varistors by means of resonant ultrasound spectroscopy
Autorzy:
Hasse, L.
Sikula, J.
Smulko, J.
Spiralski, L.
Szewczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/268036.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
warystory wysokonapięciowe
rezonansowa spektroskopia ultradźwiękowa
system do spektroskopii rezonansowej
high-voltage varistors
resonant ultrasound spectroscopy
system for resonant spectroscopy
Opis:
Rezonansowa spektroskopia ultradźwiękowa jest efektywną metoda testowania nieniszczącego ukierunkowaną na wykrywanie defektów w badanych obiektach. Procedura testująca bazuje na wzorcu rezonansów i danego obiektu, co umożliwia odrzucenie testowanych próbek nie odpowiadających wzorcowi. W zbudowanym systemie do testowania warystorów wysokonapięciowych zastosowano metodę "przemiatania" częstotliwości do pomiaru widma rezonansów, których częstotliwości zależą od niejednorodności struktury warystora. Jako kryterium testowania zaproponowano parametr jakości struktury Q, na podstawie którego proponuje się eliminację wadliwych elementów we wczesnej fazie procesu produkcyjnego.
Resonant ultrasound spectroscopy is an effective nondestructiye testing method focused on defects in tested objects. The testing procedure based on the resonant pattern allows to reject tested samples with defects do not fitting the pattern. A swept frequency method has been used to measure the spectrum of resonances in high-voltage varistors. The resonant frequencies depend on the varistor heterogeneity. The quality of the structure parameter Q has been proposed as a criterion for the "go- no go" testing for elimination of the defected elements in the preliminary stage of the varistor manufacturing process.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2008, 25; 61-66
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of quasi-resonant flyback secondary intrinsically safe power supply
Autorzy:
Lu, Shengnan
Wang, Bin
Powiązania:
https://bibliotekanauki.pl/articles/140800.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
intrinsic safety
secondary power supply
quasi-resonant technology
Opis:
In order to improve the efficiency and ensure the security of power supply used in a mine, this paper mainly studies the quasi-resonant flyback secondary power supply and analyzes its operational principles based on the requirements of soft-switching technology. In accordance with the maximum energy of a short-circuit and the request of maximum output voltage ripple, this paper calculates the spectrum value of the output filter capacitor and provides its design and procedures to determine the parameters of the main circuit of power supply. The correctness and availability of this theory are eventually validated by experiments.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 5-13
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the initial shear modulus of selected cohesive soils
Autorzy:
Gabryś, K.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/178404.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
initial soil stiffness
cohesive soils
resonant column tests
Opis:
The paper concerns the evaluation of the initial stiffness of selected cohesive soils based on laboratory tests. The research materials used in this study were clayey soils taken from the area of the road embankment No. WD-18, on the 464th km of the S2 express-way, Konotopa-Airport route, Warsaw. The initial stiffness is represented here by the shear modulus (Gmax) determined during resonant column tests. In the article, a number of literature empirical formulas for defining initial value of the shear modulus of soils being examined were adopted from the literature in order to analyze the data set. However, a large discrepancy between laboratory test results and the values of Gmax calculated from empirical relationships resulted in the rejection of these proposals. They are inaccurate and do not allow for an exact evaluation of soil stiffness for selected cohesive soils. Hence, the authors proposed their own empirical formula that enables the evaluation of the test soils’ Gmax in an easy and uncomplicated way. This unique formula describes mathematically the effect of certain soil parameters, namely mean effective stress ( p′) and void ratio (e), on the initial soil stiffness.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 2; 3-9
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wiener Filtering Applied to Conducted EMI Estimation in Soft Switching Inverter
Autorzy:
Musznicki, P.
Chrzan, P. J.
Mandrek, S.
Powiązania:
https://bibliotekanauki.pl/articles/1203943.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
wiener filtering
estimation
electromagnetic
interference
resonant power
conversion
Opis:
This paper presents an estimation method of the conducted electromagnetic interference EMI emissions in soft switching inverters. Estimation process is carried out by a number of Wiener filters, which represent different operation conditions as reflected through subsequent power converter states determined by initial commutation event conditions and propagation paths layout. Filters are fed by a semiconductor power switch voltage or current waveforms regarded as sources of perturbation. The EMI emissions are measured on the line impedance stabilization network LISN terminals. Optimal filter adaptation is effected in the frequency domain by measuring input and cross power signal spectra. Analysis of parallel quasi resonant dc link voltage inverter PQRDCLI is outlined to distinguish filters assigned for inverter operation and those for an external DC/DC converter interaction. Experimental results are given to illustrate the Wiener filtering estimation quality. Possibility of detailed decomposition of the LISN-EMI waveforms is depicted in both time and frequency domain. Comparative analysis of frequency responses for PQRDCLI link voltage changes is given.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 2; 25-28
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Converter Based Contactless Power Supply for Robots and Manipulators
Autorzy:
Moradewicz, A.
Kaźmierkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/384265.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
contactless energy transmission
series resonant converters
FPGA control
Opis:
This paper presents an inductive Contactless Power Supply (CPS) system for robots and manipulators. The energy is transmitted using rotatable transformer with adjustable air gap and power converter. To minimize total losses of the system a series resonant circuit is used. It ensures zero current switching (ZVS) condition for MOSFET power transistors. The controller and protection are implemented in FPGA system. The resonant frequency is adjusted by extreme regulator, which follows instantaneous value of primary peak current. Some simulated and experimental results, which illustrate operation of developed 3 kW laboratory model, are presented.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 3; 20-25
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrostatic Discharge Sensitivity and Resistivity Measurements of Al Nanothermites and Their Fuel and Oxidant Precursors
Autorzy:
Kelly, D.
Beland, P.
Brousseau, P.
Petre, C. F.
Powiązania:
https://bibliotekanauki.pl/articles/358130.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nanothermite
electrostatic discharge sensitivity
resonant acoustic mixing
nano aluminium
Opis:
The sensitivity of nanothermites to electrostatic discharge (ESD) has been noted by many authors. In the present work, nanothermites have been prepared using aluminium fuels with oxide (O-Al), palmitic acid (L-Al) and Viton (V-Al) passivation and CuO, Fe2O3 and MoO3 oxidants, as well as binary oxidant mixtures. Fuel- and oxidant-based ESD sensitivity trends of O-Al ≈ L-Al >> V-Al and MoO3 >> CuO ≈ Fe2O3 were observed with binary oxidants affording intermediate sensitivities. In the majority of cases, with the exception of high proportions of MoO3 oxidant, nanothermites containing V-Al fuel were the least sensitive to ESD at > 0.156 J. Resistivity measurements have been made for the fuels and oxidants and follow the trends V-Al >> O-Al ≈ L-Al and MoO3 >> Fe2O3 > CuO. V-Al resistivity of ca. 1011 Ω·cm exceeds that of the oxidants studied. An ESD sensitivity trend, based on a reduced proportion of spark current carried by the aluminium fuel, is proposed and was consistent with the observed ESD and resistivity data.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 1; 105-119
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza pracy rezonansowego układu LCL w warunkach nieciągłości prądu
The Analysis of the Resonant LCL Circuit Operation Under a Discontinuous Input Current Condition
Autorzy:
Dzieniakowski, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/159692.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
przekształtnik rezonansowy LCL
zmienność topologii
grzejnictwo indukcyjne
falownik napięcia
sterowanie przekształtnika
resonant circuit LCL
resonant converter
topology variability
induction heating
voltage inverter control
Opis:
Artykuł przedstawia analizę pracy rezonansowego układu LCL przy nieciągłym prądzie wejściowym, prowadzącym do zmienności topologii obwodu. Wyprowadzono analityczne zależności obrazujące działanie przekształtnika z obciążeniem LCL w takich warunkach. Pokazano wyniki badań teoretycznych i porównano je z rezultatami testów laboratoryjnych. Wskazano obszar występowania zjawiska zmienności topologii układu LCL i jego konsekwencje. Przedstawiono koncepcję rezonansowego przekształtnika FN-LCL o regulowanej częstotliwości wykorzystującą zjawisko zmienności topologii. Określono potencjalne aplikacje przekształtnika FN-LCL z nieciągłym prądem w grzejnictwie indukcyjnym i zilustrowano je badaniami symulacyjnymi.
The article is focused on the analysis of the LCL resonant circuit, which operates under a discontinuous input current condition. This condition leads to the LCL topology variability phenomenon that drastically changes Inverter-LCL system properties. The LCL topology variability phenomenon is precisely described. The analytical analysis presents formulae that express converter features. The theoretical results are compared with laboratory tests. The concept of Controlled Variable Frequency Resonant Converter is presented. The principle of CVFRC operation is based on the LCL topology variability phenomenon. The CVFRC description is illustrated by simulation tests and the converter potential application area in the induction heating is indicated.
Źródło:
Prace Instytutu Elektrotechniki; 2016, 272; 21-30
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiarities in optical response of hybrid-barrier GaSb/InAs/AlSb resonant tunneling diode structure
Autorzy:
Dyksik, M.
Motyka, M.
Rygała, M.
Pfenning, A.
Hartmann, F.
Weih, R.
Worschech, L.
Höfling, S.
Sęk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1835778.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
resonant tunneling diode
quantum well
optical spectroscopy
photoluminescence
photoreflectance
Opis:
We present comprehensive investigation of the optical properties of hybrid-barrier GaSb-based resonant tunneling structures, containing a bulk-like GaInAsSb absorption layer and two asymmetric type II GaSb/InAs/AlSb quantum wells. Methods of optical spectroscopy by means of Fourier-transformed photoluminescence and photoreflectance are employed to probe optical transitions in this complex multilayer system. Based on the comparison between the absorption-like and emission-like spectra (also in function of temperature) confronted with band structure calculations four main transitions could be resolved and identified. For one of them, there has been observed unusually strong linear polarization dependence never reported in structures of that kind. It has been interpreted as related to a transition at the GaSb/GaInAsSb interface, for which various scenarios causing the polarization selectivity are discussed.
Źródło:
Optica Applicata; 2021, 51, 2; 171-180
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 82

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