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    Wyświetlanie 1-5 z 5
    Tytuł:
    Supercapacitor Degradation Assesment by Power Cycling and Calendar Life Tests
    Autorzy:
    Sedlakova, V.
    Sikula, J.
    Majzner, J.
    Sedlak, P.
    Kuparowitz, T.
    Buergler, B.
    Vasina, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221305.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    supercapacitor equivalent circuit
    supercapacitor parameter evaluation
    supercapacitor reliability
    power cycling life test
    calendar life test
    Opis:
    Degradation of Supercapacitors (SC) is quantified by accelerated ageing tests. Energy cycling tests and calendar life tests are used since they address the real operating modes. The periodic characterization is used to analyse evolution of the SC parameters as a whole, and its Helmholtz and diffusion capacitances. These parameters are determined before the ageing tests and during 3 × 105 cycles of both 75% and 100% energy cycling, respectively. Precise evaluation of the capacitance and Equivalent Series Resistance (ESR) is based on fitting the experimental data by an exponential function of voltage vs. time. The ESR increases linearly with the number (No) of cycles for both 75% and 100% energy cycling, whereas a super-linear increase of ESR vs. time of cycling is observed for the 100% energy cycling. A decrease of capacitance in time had been evaluated for 2000 hours of ageing of SC. A relative change of capacitance is ΔC/C0 = 16% for the 75% energy cycling test and ΔC/C0 = 20% for the 100% energy cycling test at temperature 25°C, while ΔC/C0 = 6% for the calendar test at temperature 22°C for a voltage bias V = 1.0 Vop. The energy cycling causes a greater decrease of capacitance in comparison with the calendar test; such results may be a consequence of increasing the temperature due to the Joule heat created in the SC structure. The charge/discharge current value is the same for both 75% and 100% energy cycling tests, so it is the Joule heat created on both the equivalent series resistance and time-dependent diffuse resistance that should be the source of degradation of the SC structure. The diffuse resistance reaches a value of up to 30Ω within each 75% energy cycle and up to about 43Ω within each 100% energy cycle.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 3; 345-358
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The control system based on FPGA technology for fatigue test stand MZGS-100 PL
    System sterowania maszyny do badań zmęczeniowych materiałów konstrukcyjnych typu MZGS 100-PL w technologii FPGA
    Autorzy:
    Macek, W.
    Macha, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/139983.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FPGA
    control system
    mechatronics
    fatigue test
    strain energy parameter
    system sterujący
    mechatronika
    test zmęczeniowy
    energetyczna charakterystyka zmęczeniowa
    Opis:
    The paper presents a solution of the control system for fatigue test stand MZGS-100 PL, comprising the integrated Real-Time controller based on FPGA (Field-Programmable Gate Array) technology with LabVIEW software. The described control system performs functions such as continuous regulation of speed induction motor, measuring strain of the lever machine and the test specimen, displacement of the polyharmonic vibrator, as well as the elimination of interferences, overload protection and emergency stop of the machine. The fatigue test stand also allows to set the pseudo-random history of energy parameter W(t).
    W pracy przedstawiono rozwiązanie układu sterowania maszyny zmęczeniowej MZGS-100PL, w oparciu o zintegrowany sterownik czasu rzeczywistego NI cRIO-9074 z oprogramowaniem Lab-VIEW w technologii FPGA. Przedstawiony układ sterowania umożliwia płynną regulację prędkości obrotowej silnika indukcyjnego, pomiar odkształceń dźwigni maszyny i badanej próbki, przemieszczenie wibratora poliharmonicznego, jak również eliminację zakłóceń oraz zabezpieczenie przed przeciążeniem i zatrzymanie awaryjne maszyny. Zaprezentowany system mechatroniczny do wyznaczania energetycznych charakterystyk zmęczeniowych materiałów przy zginaniu i skręcaniu pozwala na wyznaczanie energetycznych charakterystyk zmęczeniowych materiałów (Wa-N) przy obciążeniach cyklicznych oraz generowanie obciążeń pseudolosowych (poliharmonicznych).
    Źródło:
    Archive of Mechanical Engineering; 2015, LXII, 1; 85-100
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applicability of Park transformation for the analysis of transient performance during subsynchronous resonances
    Autorzy:
    Kreischer, Ch.
    Kulig, S.
    Göbel, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/140498.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    subsynchronous resonances
    parameter identification
    equivalent circuit
    standstill frequency response test
    three phase short circuit test
    evolutionary strategy
    Opis:
    Long transmission lines have to be compensated to enhance the transport of active power. But a wrong design of the compensation may lead to subsynchronous resonances (SSR). For studies often park equivalent circuits are used. The parameters of the models are often determined analytically or by a three-phase short-circuit test. Models with this parameters give good results for frequencies of 50 Hz and 100 Hz resp. 60 Hz and 120 Hz. But SSR occurs at lower frequencies what arises the question of the reliability of the used models. Therefore in this publication a novel method for the determination of Park equivalent circuit parameters is presented. Herein the parameters are determined form time functions of the currents and the electromagnetic moment of the machine calculated by transient finite-element simulations. This parameters are used for network simulations and compared with the finite-element calculations. Compared to the parameters derived by a three-phase short-circuit a significant better accuracy of simulation results can be achieved by the presented method.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 3; 401-415
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of synchronous generator nonlinear model parameters based on power rejection tests using a gradient optimization algorithm
    Autorzy:
    Boboń, A.
    Nocoń, A.
    Paszek, S.
    Pruski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200774.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gradient optimization algorithms
    synchronous generator model
    parameter estimation
    load rejection test
    algorytm optymalizacji gradientu
    modele generatorów synchronicznych
    estymacja parametrów
    test odrzucenia ładunku
    Opis:
    The paper presents a method for determining electromagnetic parameters of different synchronous generator models based on dynamic waveforms measured at power rejection. Such a test can be performed safely under normal operating conditions of a generator working in a power plant. A generator model was investigated, expressed by reactances and time constants of steady, transient, and subtransient state in the d and q axes, as well as the circuit models (type (3,3) and (2,2)) expressed by resistances and inductances of stator, excitation, and equivalent rotor damping circuits windings. All these models approximately take into account the influence of magnetic core saturation. The least squares method was used for parameter estimation. There was minimized the objective function defined as the mean square error between the measured waveforms and the waveforms calculated based on the mathematical models. A method of determining the initial values of those state variables which also depend on the searched parameters is presented. To minimize the objective function, a gradient optimization algorithm finding local minima for a selected starting point was used. To get closer to the global minimum, calculations were repeated many times, taking into account the inequality constraints for the searched parameters. The paper presents the parameter estimation results and a comparison of the waveforms measured and calculated based on the final parameters for 200 MW and 50 MW turbogenerators.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 479-488
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The presence of anti-Hypoderma antibodies in udder milk samples, and correlation with selected parameters of dairy performance
    Autorzy:
    Bednarko-Mlynarczyk, E.
    Szteyn, J.
    Bialobrzewski, I.
    Wiszniewska-Laszczych, A.
    Liedtke, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/30409.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Hypoderma
    antibody
    udder
    milk sample
    correlation
    milk parameter
    dairy performance
    ELISA test
    hypodermosis
    dairy cow
    cow
    milk yield
    milk protein
    animal disease
    parasitic disease
    Opis:
    Hypodermosis is responsible for significant economic losses and remains a current problem in animal husbandry. This study determined the extent of Hypoderma spp. invasion in north-eastern Poland in dairy herds. The extent of the invasion, determined on the basis of positive results of an ELISA assay (Bovine Hypodermosis Milk Screening of Institut Pourquier), varied in herds. Statistical analysis performed on the results of milk productivity and content of basic components revealed a decrease in the milk yield and changes in milk protein in animals revealing positive, doubtful and negative results. Statistically significant differences were absent as regards the content of milk fat or milk total solids. The milk yield and the content of particular milk components were determined using the AT4 method, as part of a control program carried out by the Polish Federation of Cattle Breeders and Dairy Farmers (PFHBiPM).
    Źródło:
    Polish Journal of Veterinary Sciences; 2012, 15, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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