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    Wyświetlanie 1-3 z 3
    Tytuł:
    Research on a novel hybrid shielding structure of magnetic coupler for inductive power transfer system
    Autorzy:
    Liu, Yun Rui
    Wang, Chunfang
    Xia, Dongwei
    Yue, Rui
    Powiązania:
    https://bibliotekanauki.pl/articles/1841326.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coupling coefficient
    electromagnetic shielding
    finite element simulation
    optimization design
    wireless power transfer
    współczynnik sprzężenia
    ekranowanie elektromagnetyczne
    symulacja elementów skończonych
    optymalizacja projektu
    bezprzewodowy transfer mocy
    Opis:
    With the development of wireless power transfer technology, more and more attention has been paid to its electromagnetic safety. In this paper, a novel hybrid shielding structure composed of the innermost fan-shaped ferrite, the interlayer nanocrystalline stripand the outermost aluminum foil is proposed to shield the electromagnetic field of the inductive power transfer system. Eight structure parameters of the proposed shielding areoptimized by finite element simulation, in order to reduce the magnetic leakage of the system and improve the utilization rate of shielding materials. In addition, the proposed structure is compared with two types of typical double-layer hybrid shielding from the perspectives of the weight, the coupling coefficient and the magnetic flux leakage. Both simulation and experiment results show that the cost and weight of the proposed shield are about 60% lower than the traditional disk shield. More over, the shielding layer proposed in this paper can not only effectively reduce the magnetic flux leakage of the system, but also maintain a high coupling coefficient.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 129-143
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic performance and stability analysis of an active inerter-based suspension with time-delayed acceleration feedback control
    Autorzy:
    Wang, Yong
    Jin, Xian-Yu
    Zhang, Yun-Shun
    Ding, Hu
    Chen, Li-Qun
    Powiązania:
    https://bibliotekanauki.pl/articles/2173651.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active inerter-based suspension
    acceleration feedback control
    dynamic performance
    stability analysis
    time delay
    kontrola sprzężenia zwrotnego przyspieszenia
    wydajność dynamiczna
    aktywne zawieszenie na bazie inertera
    analiza stabilności
    opóźnienie
    Opis:
    An active inerter-based suspension with acceleration feedback control is proposed in this paper, the time delay generated in the controllers and actuators is considered, which constitutes the time-delayed active inerter-based (TDA-IB) suspension. The dynamic equation of the TDA-IB suspension is established and is a neutral type of delay differential equation (NDDE) in which the time delay exists in the highestorder derivative. The stability analysis is conducted by calculating the number of unstable characteristic roots based on the definite integral stability method, the stable and unstable regions are determined. The effect of time delay and feedback gain on the dynamic performance of the TDA-IB suspension under harmonic, random, and shock excitations is studied in detail and compared with the parallel-connected inerterbased (PC-IB) and traditional suspensions. The results show that the TDA-IB suspension is asymptotically stable for smaller feedback gain and time delay, through increasing the feedback gain, the stable regions shrink, and a smaller time delay could cause the system to become unstable. Furthermore, the time delay could regulate the resonance peak around the unsprung mass natural frequency and generate multiple high-frequency resonance peaks. If the time delay is chosen appropriately and falls into the stable range, the TDA-IB suspension could improve the dynamic performance for the suspension stroke and dynamic tire load while having a deterioration for the vehicle body acceleration compared with the PC-IB and traditional suspensions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140687
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study On The Fabrication Of Iron Powder From Forging Scale Using Hydrogen
    Próby wytwarzanie proszku żelaza metodą redukcji zgorzeliny pochodzącej z procesów kucia za pomocą wodoru
    Autorzy:
    Shin, S. M.
    Lee, D.-W.
    Yun, J.-Y.
    Kang, Ch.-Y.
    Wang, J.-P.
    Powiązania:
    https://bibliotekanauki.pl/articles/350946.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    forging scale
    hydrogen partial pressure
    hematite
    iron powder
    kucie za pomocą wodoru
    hematyt
    redukcja zgorzeliny
    proszek żelaza
    Opis:
    This study was conducted to investigate the effect of hydrogen content, temperature, reaction time for the reduction of forging scale which is mainly composed of hematite (Fe2O3). All reductive reactions were performed over the temperature range of 700 to 1200°C as well as 0.1 to 1 atm of hydrogen partial pressures. The results showed that the mechanism for the reduction of iron oxides using hydrogen gas was not a simple process, but proceeded in multiple reduction stages thermodynamically. The iron oxide was almost completely reduced to metallic iron powder with 91 wt.% of iron content in the forging scale at 0.1 atm of hydrogen partial pressure. The content of iron was however found to be increased with increasing hydrogen partial pressure from 0.1 to 1 atm with regardless of temperatures. The metallic iron powder was obtained with the mean size of 100 μm and more porous structure was observed.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1547-1549
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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