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    Wyświetlanie 1-7 z 7
    Tytuł:
    Dynamic characteristics of the proton exchange membrane fuel cell module
    Autorzy:
    Cieśliński, J. T.
    Kaczmarczyk, T. Z.
    Dawidowicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/240068.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PEM fuel cell
    hydrogen
    dynamic characteristics
    ogniwo paliwowe PEM
    wodór
    charakterystyka dynamiczna
    Opis:
    The paper describes a fuel cell based system and its performance. The system is based on two fuel cell units, DC/DC converter, DC/AC inverter, microprocessor control unit, load unit, bottled hydrogen supply system and a set of measurement instruments. In the study presented in the paper a dynamic response of the proton exchange membrane (PEM) fuel cell system to unit step change load as well as to periodical load changing cycles in the form of semi-sinusoidal and trapezoidal signals was investigated. The load was provided with the aid of an in-house-developed electronic load unit, which was fully PC controlled. The apparatus was commissioned by testing the steady-state operation of the module. The obtained efficiency of the fuel cell shows that the test apparatus used in the study provides data in substantial agreement with the manufacturer’s data.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 4; 125--140
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design sensitivity analysis of frequency response functions and steady-state response for structures with viscoelastic dampers
    Autorzy:
    Łasecka-Plura, M.
    Lewandowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/127950.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    fractional models of VE dampers
    dynamic characteristics
    design sensitivity
    amortyzatory
    charakterystyka dynamiczna
    wrażliwość projektowa
    Opis:
    In this paper, the design sensitivity of the frequency response function and amplitudes of the steady-state vibration of planar frames with viscoelastic (VE) dampers mounted on them is considered. The dampers are modeled using a five-parameter rheological model with fractional derivatives. The design sentisivity with respect to change of damper parameter is analyzed in detail. The direct method is used to determine the first and the second order sensitivities. Moreover, the results of typical calculations are presented and discussed.
    Źródło:
    Vibrations in Physical Systems; 2014, 26; 129-136
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximate method for determination of dynamic characteristics of structures with viscoelastic dampers
    Autorzy:
    Lewandowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/127718.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    structures
    viscoelastic damper
    generalized fractional model
    dynamic characteristics
    struktury
    tłumik lepkosprężysty
    uogólniony model ułamkowy
    charakterystyka dynamiczna
    Opis:
    An approximate method for determination of dynamic characteristics of structures with viscoelastic dampers is proposed in this paper. A fractional derivative is used to describe the dynamic behaviour of viscoelastic dampers. The method is based on a continuous dependency of the sensitivity of eigenvalue on a certain artificially introduced parameter which scaled up the influence of the damping term in the eigenvalue problem. Some results of a representative calculation are also presented and briefly discussed.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 219-226
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the maximum magnetic energy on dynamic parameters of the electric drive
    Wpływ maksymalnej energii magnetycznej na dynamiczne parametry napędu elektrycznego
    Autorzy:
    Volokitina, Y.
    Goloviznin, S.
    Shalaginov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/159932.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    silnik elektryczny bezszczotkowy
    charakterystyka dynamiczna
    energia magnetyczna
    brushless electric motors
    improving dynamic characteristics
    maximum magnetic energy
    Opis:
    In the paper there are questions of increase of the angular velocity of the airship rudder surfaces for the sinusoidal control input signal under conservation of the electric drive dynamic parameters by using the permanent magnets with higher maximum magnetic energy.
    Artykuł omawia problemy wzrostu prędkości kątowej powierzchni sterów statków powietrznych dla sinusoidalnego wejściowego sygnału sterowania przy zachowaniu dynamicznych parametrów elektrycznego napędu przy użyciu magnesów trwałych o wyższej energii maksymalnej.
    Źródło:
    Prace Instytutu Elektrotechniki; 2006, 229; 97-105
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study of the sensitivity analysis for systems with viscoelastic elements
    Autorzy:
    Łasecka-Plura, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/27309874.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    sensitivity analysis
    viscoelastic damping elements
    dynamic characteristics
    fractional
    derivatives
    analiza wrażliwości
    lepkosprężyste elementy tłumiące
    charakterystyka dynamiczna
    Opis:
    This paper discusses the different methods used for calculating first- and second-order sensitivity: the direct differentiation method, the adjoint variables method, and the hybrid method. The solutions obtained allow determining the sensitivity of dynamic characteristics such as eigenvalues and eigenvectors, natural frequencies, and nondimensional damping ratios. The methods were applied for analyzing systems with viscoelastic damping elements, whose behavior can be described by classical and fractional rheological models. However, the derived formulas are general and can also be applied to systems with damping elements described by other models. Their advantage is a compact and easy to code form. The paper also presents a comparison of the computational costs of the discussed methods. The correctness of all the proposed methods has been illustrated with numerical examples.
    Źródło:
    Archive of Mechanical Engineering; 2023, LXX, 1; 5--25
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental dynamic damage assessment of PUFJ protected brick infilled RC building during successive shake table tests
    Autorzy:
    Kwiecień, Arkadiusz
    Rakicevic, Zoran
    Chełmecki, Jarosław
    Bogdanovic, Aleksandra
    Tekieli, Marcin
    Hojdys, Łukasz
    Gams, Matija
    Krajewski, Piotr
    Manojlovski, Filip
    Soklarovski, Antonio
    Halici, Omer Faruk
    Rousakis, Theodoros
    Vanian, Vachan
    Powiązania:
    https://bibliotekanauki.pl/articles/27311429.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    shake table
    earthquake
    dynamic characteristics
    modal hammer
    DIC
    digital image correlation
    stół wstrząsowy
    trzęsienie ziemi
    charakterystyka dynamiczna
    młotek modalny
    cyfrowa korelacja obrazów
    Opis:
    It is highly important to determine eigenvalues before and after certain extreme events that may cause damage accumulation, such as earthquake, blasts and mining or seismic tests on research models. Unique experiment design and shake table testing was performed to investigate seismic performance of a 3D RC building model with infill walls and advanced protection with polyurethane-based joints and fiber polymer reinforced light and emergency jackets. For the purpose of wider experimental activities, three methods for determination of the dynamic characteristics were used during multiple successive shake table tests following a dynamic pushover approach, and they are presented in detail. They are: inertance function through impact hammer tests, standard Fourier transformation of measured acceleration time history and digital image correlation. The expected differences in the results are related to the type and intensity of excitation used, the involvement of materials with different mechanical and physical properties, and with the different rate and extent of damage accumulation, as well as to local or global measurements. Y et, all methods lead to reliable results when a consistent methodology is being used, that takes into account locality or globality of measurements, leaving a choice for the most suitable one, depending on the site conditions. The inertance function method presented manifested its high efficiency in analysis of dynamic properties of large-scale structures and in monitoring of their changes caused by the damage and repair process. It offers quite a wide range of useful information, does not require very expensive equipment and its transportation cost is negligible. This method seems to be a proper diagnostic tool for simple experimental modal analysis of real structures and their structural elements, where detection of changes in the structural condition and in dynamic properties is required, also as a non-destructive testing and monitoring method. Digital image correlation proved to be a promising non-contact tool, strongly supporting the conventional instrumentation of shake table testing, while the Fourier transformation was used as a benchmark method yielding the most reliable results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e144940
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic characteristics of underframe semi-active inerter-based suspended device for high-speed train based on LQR control
    Autorzy:
    Wang, Yong
    Li, Hao-Xuan
    Meng, Hao-Dong
    Wang, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/2173695.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic characteristics
    high-speed train
    inerter-based suspended device
    LQR control
    Sperling index
    charakterystyka dynamiczna
    pociąg dużych prędkości
    aktywne zawieszenie na bazie inertera
    kontrola LQR
    indeks Sperlinga
    Opis:
    The underframe passive inerter-based suspended device, based on the inerter-spring-damper vibration attenuation structure, could improve the dynamic performance of the train body, but its parameters are fixed and cannot meet the dynamic performance requirements under different operating conditions. Therefore, a semi-active inerter-based suspended device based on the linear quadratic regulator (LQR) control strategy is proposed to further enhance the dynamic performance. The rigid-flexible coupling vertical dynamic model of the train body and an underframe semi-active inerter-based suspended device are established. The structural parameters of the semi-active inerter-based suspended device are adjusted using LQR control strategy. Dynamic response of the system is obtained using the virtual excitation method. The dynamic characteristic of the system is evaluated using the Sperling index and compared with those of the passive and semi-active traditional suspended devices as well as the passive inerter-based suspended devices. The vertical vibration acceleration of the train body and Sperling index using the semi-active inerter-based suspended device is the smallest among the four suspended devices, which denotes the advantages of using the inerter and LQR control strategy. The semi-active inerter-based suspended device could decrease the vertical vibration acceleration of the train body and further suppress its elastic vibration in the lower frequency band, more effectively than the other three suspended devices. Overall, the semi-active inerter-based suspended device could significantly reduce elastic vibration of the train body and improve its dynamical performance.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141722
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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