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    Wyświetlanie 1-11 z 11
    Tytuł:
    A mode-III crack with variable surface effects
    Autorzy:
    Wang, X.
    Schiavone, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/282009.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    surface elasticity
    variable surface moduli
    mode-III crack
    Cauchy singular integro-differential equation
    Opis:
    We study the contribution of variable surface effects to the antiplane deformation of a linearly elastic material with a mode-III crack. The surface elasticity is incorporated using a modified version of the continuum based surface/interface model of Gurtin and Murdoch. In our discussion, the surface moduli are not constant but vary along the crack surfaces. Using Green’s function method, the problem is reduced to a single first-order Cauchy singular integro-differential equation, which is solved numerically using Chebyshev polynomials and a collocation method. Our results indicate that the gradient of the surface shear modulus exerts a significant influence on the crack opening displacement and on the singular stress field at the crack tips.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1319-1327
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ground leakage current caused by Common-Mode Voltage of PWM inverter
    Prądy upływu doziemnego generowane napięciem wspólnym falownika MSI
    Autorzy:
    Szymański, Jerzy Ryszard
    Żurek-Mortka, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/106701.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Technologiczno-Humanistyczny im. Kazimierza Pułaskiego w Radomiu
    Tematy:
    common-mode voltage
    differential-mode voltage
    PWM modulation
    three-phase traction voltage inverter
    two-level PWM inverter
    dwupoziomowy falownik MSI
    napięcie różnicowe
    napięcie wspólne
    modulacja MSI
    trójfazowy trakcyjny falownik napięciowy
    Opis:
    In railway tractive vehicles, three-phase PWM (Pulse Width Modulation) inverters generate parasitic Differential-Mode Voltages (DMV) and Common-Mode Voltages (CMV). Parasitic voltages are a side effect of using the width modulation to shape the phase-to-phase inverter’s voltage. In this article, the authors present a mathematical description of the DM and CM voltages and carry out their spectral analysis. Based on the spectral harmonics analysis, the authors present a method for filtration of harmonics of DM and CM voltages aimed at limiting the capacitance parasitic currents: due to DM voltage – phase-to-phase parasitic current and CM voltage – ground parasitic currents. As the final result of the tests, almost complete elimination of leakage parasitic current form PE shock protection system was achieved.
    W kolejowych pojazdach trakcyjnych trójfazowe falowniki MSI (Modulacja Szerokości Impulsów) wytwarzają pasożytnicze napięcia różnicowe (Differential Mode Voltage) i wspólne (Common Mode Voltage). Pasożytnicze napięcia są skutkiem ubocznym stosowania modulacji szerokościowej do kształtowania napięć międzyfazowych falownika. W artykule autorzy przedstawiają opis matematyczny napięć DM oraz CM i przeprowadzają ich analizę widmową. Na podstawie przeprowadzanej analizy autorzy przedstawiają metodę filtracji wybranych harmonicznych napięcia DM i CM dla ograniczania wytwarzanych przez nie prądów pasożytniczych: (DM) - międzyfazowych i (CM) – doziemnych. W wyniku badań osiągnięto prawie całkowitą eliminację pasożytniczego prądu upływu doziemnego z systemu ochrony przeciwporażeniowej PE.
    Źródło:
    Journal of Civil Engineering and Transport; 2019, 1, 1; 15-25
    2658-1698
    2658-2120
    Pojawia się w:
    Journal of Civil Engineering and Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distributive differential modals
    Autorzy:
    Ślusarska, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/728834.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    differential groupoid
    mode
    modal
    Opis:
    A differential modal is an algebra with two binary operations such that one of the reducts is a differential groupoid and the other is a semilattice, and with the groupoid operation distributing over the semilattice operation. The aim of this paper is to show that the varieties of entropic and distributive differential modals coincide, and to describe the lattice of varieties of entropic differential modals.
    Źródło:
    Discussiones Mathematicae - General Algebra and Applications; 2008, 28, 1; 29-47
    1509-9415
    Pojawia się w:
    Discussiones Mathematicae - General Algebra and Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General remarks on dynamic projection method
    Autorzy:
    Leble, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938597.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    partial differential equations
    dynamical system
    Cauchy problem
    diffusion equation
    projection operator
    idempotent operators
    eigen mode
    mode interaction
    boundary regime propagation
    Opis:
    A brief history and a mathematical description of the dynamic projection operators technique is presented. An example of the general Cauchy problem for evolution equations in 1+ 1 dimensions is studied in detail. A boundary regime propagation is formulated in terms of operators and illustrated by the simplest one-dimensional diffusion equation. The problem of temperature waves is discussed.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 113-130
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review and comparison of methods for limiting leakage currents in single-phase transformerless PV inverter topologies
    Autorzy:
    Kołodziejski, Wojciech
    Jasielski, Jacek
    Kuta, Stanisław W.
    Szerszeń, Grzegorz
    Machowski, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/29521110.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Tarnowska
    Tematy:
    Differential Mode (DM) voltage
    Common Mode (CM) voltage
    grid-tied inverter
    leakage current
    parasitic capacity
    photovoltaic (PV) systems
    transformerless inverter
    napięcie trybu różnicowego (DM).
    napięcie trybu wspólnego (CM).
    falownik podłączony do sieci
    prąd upływowy
    pojemność pasożytnicza
    systemy fotowoltaiczne (PV).
    falownik beztransformatorowy
    Opis:
    Transformerless inverters are widely used in different photovoltaic nonisolated ac module applications, mainly in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency over a wide load range, and low cost. Various transformerless inverter topologies have been proposed to meet the safety requirement of low ground leakage currents, such as specified in the VDE-4105 standard and low-output ac-current distortion. Topology modifications of transformerless full bridge inverters are designed to balance and maintain a constant common mode output voltage, thereby eliminating or reducing leakage currents. This article reviews and compares the different methods for limiting leakage currents in known topologies of the full-bridge transformerless inverters, such as: H4, H5, H6, HERIC, and their improvements. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. To compare the properties of different medium to high power inverters, PV inverter topologies were implemented using IGBTs and tested with the same components, same simulation parameters in PSPICE to evaluate their performance in terms of energy efficiency and leakage current characteristics. The detailed power stage operating principles, extended PWM modulator, and integrated universal gate driver with galvanic isolation in the transmission path of control signal for all IGBTs of the inverter, as well isolated and floating bias power supply for gate drivers are described.
    Źródło:
    Science, Technology and Innovation; 2022, 16, 3-4; 1-19
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A 1.67 pJ/Conversion-step 8-bit SAR-Flash ADC Architecture in 90-nm CMOS Technology
    Autorzy:
    Khatak, Anil
    Kumar, Manoj
    Dhull, Sanjeev
    Powiązania:
    https://bibliotekanauki.pl/articles/1844527.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analog to digital converter
    ADC
    successive approximation register (SAR)
    common mode current feedback gain boosting
    CMFD-GB
    residue amplifier
    RA
    spurious free dynamic range
    SFDR
    integral nonlinearity
    INL
    differential nonlinearity
    DNL
    Opis:
    A novice advanced architecture of 8-bit analog to digital converter is introduced and analyzed in this paper. The structure of proposed ADC is based on the sub-ranging ADC architecture in which a 4-bit resolution flash-ADC is utilized. The proposed ADC architecture is designed by employing a comparator which is equipped with common mode current feedback and gain boosting technique (CMFD-GB) and a residue amplifier. The proposed 8 bits ADC structure can achieve the speed of 140 mega-samples per second. The proposed ADC architecture is designed at a resolution of 8 bits at 10 MHz sampling frequency. DNL and INL values of the proposed design are -0.94/1.22 and -1.19/1.19 respectively. The ADC design dissipates a power of 1.24 mW with the conversion speed of 0.98 ns. The magnitude of SFDR and SNR from the simulations at Nyquist input is 39.77 and 35.62 decibel respectively. Simulations are performed on a SPICE based tool in 90 nm CMOS technology. The comparison shows better performance for this proposed ADC design in comparison to other ADC architectures regarding speed, resolution and power consumption.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 347-354
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decomposition of EMI Noise into Common and Differential Modes in PWM Inverter Drive System
    Autorzy:
    Kempski, A.
    Smoleński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/262576.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    electromagnetic compatibility
    common mode
    differential mode
    PWM inverter drive system
    Opis:
    In this paper [20] an analytical approach to decomposition of total phase EMI noises through algebraic calculations and the Fourier transform has been presented. Separating conducted EMI noise into different, common and differential mode (CM and DM) HF current components is important for a proper spectral analysis and application of EMI mitigation techniques. The results of calculations have been compared to EMI currents measured on the motor side of the PWM drive system. The proposed approach can be useful in comparative analysis of the influence of inverter control algorithms on spectra of CM currents in a given drive system.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 53-58
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differential and Common Mode Noise Waves and Correlation Matrices
    Autorzy:
    Dobrowolski, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226394.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    differential and common mode noise waves
    mixed-mode noise wave correlation matrices
    generalized multiport mixed-mode noise wave correlation matrice
    Opis:
    This paper presents an innovative extention of the noise wave definition to mixed mode, differential – and common-mode noise waves which can be used for noise analysis of differential microwave networks. Mixed mode noise waves are used next to define generalized mixed mode noise wave correlation matrices of microwave multiport networks. Presented approach may be used for noise analysis of microwave differential networks with differential ports as well as with conventional single ended ports.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 2; 133-141
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shape Optimization of Mufflers Composed of Multiple Rectangular Fin-Shaped Chambers Using Differential Evolution Method
    Autorzy:
    Chiu, M.-C.
    Chang, Y.-C.
    Cheng, H.-C.
    Tai, W.-T.
    Powiązania:
    https://bibliotekanauki.pl/articles/177237.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fin
    multi-chamber
    high-order-mode
    differential evolution
    Opis:
    There has been considerable research done on multi-chamber mufflers used in the elimination of industrial venting noise. However, most research has been restricted to lower frequencies using the plane wave theory. This has led to underestimating acoustical performances at higher frequencies. Additionally, because of the space-constrained problem in most plants, the need for optimization of a compact muffler seems obvious. Therefore, a muffler composed of multiple rectangular fin-shaped chambers is proposed. Based on the eigenfunction theory, a four-pole matrix used to evaluate the acoustic performance of mufflers will be deduced. A numerical case for eliminating pure tones using a three-fin-chamber muffler will also be examined. To delineate the best acoustical performance of a space-constrained muffler, a numerical assessment using the Differential Evolution (DE) method is adopted. Before the DE operation for pure tone elimination can be carried out, the accuracy of the mathematical model must be checked using experimental data. The results reveal that the broadband noise has been efficiently reduced using the three-fin-chamber muffler. Consequently, a successful approach in eliminating a pure tone using optimally shaped three-fin-chamber mufflers and a differential evolution method within a constrained space has been demonstrated.
    Źródło:
    Archives of Acoustics; 2015, 40, 3; 311-319
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technique to improve CMRR at high frequencies in CMOS OTA-C filters
    Autorzy:
    Blakiewicz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/200504.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    common-mode rejection ratio
    CMRR
    CMOS
    OTA
    differential pair
    OTA-C filters
    component mismatch
    Opis:
    In this paper a technique to improve the common-mode rejection ratio (CMRR) at high frequencies in the OTA-C filters is proposed. The technique is applicable to most OTA-C filters using CMOS operational transconductance amplifiers (OTA) based on differential pairs. The presented analysis shows that a significant broadening of CMRR bandwidth can be achieved by using a differential pair with the bodies of transistors connected to AC ground, instead of using a pair with the bodies connected to the sources. The key advantages of the technique are: no increase in power consumption (except for an optional tuning circuit), a small increase of a chip area, a slight modification of the original filter. The simulation results for exemplary OTAs and a low-pass filter, designed in a 0.35 μm CMOS process, show the possibility of broadening the CMRR bandwidth several times.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 697-703
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical models synthesis of power electronic converters
    Autorzy:
    Ales, A.
    Cheurfi-Belhadj, M. A.
    Schanen, J. L.
    Moussaoui, D.
    Roudet, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/136182.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    EMC modelling
    differential mode
    common mode
    EMC filter
    LISN
    EMI
    conducted noise
    noise source
    Opis:
    In this paper we proposes a synthesis of different mathematical models of power electronic converters based on Thevenin/Norton equivalent circuits. Those models, composed by impedances and harmonic noise sources, are helpful to predict the conducted ElectroMagnetic Interferences (EMI) generated by converters connected to the electrical network. Moreover, the extracted impedances are determining for sizing EMC filters. The proposed analytical model is tested with PSpice simulations and validated by experimental measurements, from DC frequency until 30MHz.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 1; 52-59
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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