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    Wyświetlanie 1-4 z 4
    Tytuł:
    Predictive current control for permanent magnet synchronous motor based on internal model control observer
    Autorzy:
    Tang, Min'at
    Wang, Chenyu
    Luo, Yinhang
    Powiązania:
    https://bibliotekanauki.pl/articles/2086720.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    internal model control observer
    MPC
    PMSM
    predictive current control
    Opis:
    The model predictive current control (MPCC) of the permanent magnet synchronous motor (PMSM) is highly dependent on motor parameters, and a parameter mismatch will cause the system performance degradation. Therefore, a strategy based on an internal model control (IMC) observer is proposed to correct the mismatch parameters. Firstly, based on the MPCC strategy of the PMSM, according to the dynamic model of the PMSM in a rotating orthogonal coordinate system, -axis and -axis current IMC observers are designed, and the stability derivation is carried out. It is proved that the observer can estimate -axis and -axis disturbance components caused by a parameter mismatch without static error. Then, the estimated disturbance component is compensated for by the reference voltage prediction expression. Finally, the effectiveness of the proposed strategy is verified in two different conditions. The experimental results show that the proposed control strategy can effectively compensate for the parameter mismatch disturbance in MPCC for PMSM, improve the dynamic and static performance of the system, and improve the robustness of the system. voltage prediction expression. Finally, the effectiveness of the proposed strategy is verified in two different conditions. The experimental results show that the proposed control strategy can effectively compensate for the parameter mismatch disturbance in MPCC for PMSM, improve the dynamic and static performance of the system, and improve the robustness of the system.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 2; 343--362
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of quaternary ammonium salt hydrophobic modifiers on the α-quartz (001) surface: a density functional theory study
    Autorzy:
    Liu, Chunfu
    Wang, Weitao
    Wang, Han
    Zhu, Chenyu
    Ren, Bao
    Powiązania:
    https://bibliotekanauki.pl/articles/24085768.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    α-quartz (001) surface
    quaternary ammonium salt
    density functional theory
    adsorption mechanism
    Opis:
    To investigate the adsorption mechanism of quaternary ammonium salt on the α-quartz (001) surface, the adsorption models of hydrophobic modifiers 1231, 1431, 1631 and 1831 were constructed and simulated using the density functional theory (DFT). Results indicate that the adsorption energy of quaternary ammonium salt increases with the increase of carbon chain length, and the adsorption en-ergy reaches the maximum at 18 carbon atoms; however, the adsorption capacity of 1631 is weak owing to the carbon chain deflection. Based on the Mulliken bond population analysis, reagent 1831 has the strongest interaction with α-quartz (001) surface compared with 1231, 1431 and 1631; and during the adsorption process, charge transfer and electrostatic attraction occur between the reagent and α-quartz (001) surface with similar degrees of charge transfer observed. This study emphasizes that electrostatic attraction plays a key role in the adsorption process, while the week hydrogen bonding plays a second-ary role.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 170260
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparisons Between 2D and 3D MPFEM Simulations in Modeling Uniaxial High Velocity Compaction Behaviors of Ti-6Al-4V Powder
    Autorzy:
    Zhou, Jian
    Xu, Hongkun
    Zhu, Chenyu
    Wang, Bin
    Liu, Kun
    Powiązania:
    https://bibliotekanauki.pl/articles/2048874.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-particle finite element method
    Ti-6Al-4V
    powder compaction
    relative green density
    impact energy per unit mass
    Opis:
    Multi-particle finite element method (MPFEM) simulation has been proven an efficient approach to study the densification behaviors during powder compaction. However, comprehensive comparisons between 2D and 3D MPFEM models should be made, in order to clarify which dimensional model produces more accurate prediction on the densification behaviors. In this paper, uniaxial high velocity compaction experiments using Ti-6Al-4V powder were performed under different impact energy per unit mass notated as Em. Both 2D and 3D MPFEM simulations on the powder compaction process were implemented under displacement control mode, in order to distinguish the differences. First, the experimental final green density of the compacts increased from 0.839 to 0.951 when Em was increased from 73.5 J/g to 171.5 J/g. Then detailed comparisons between two models were made with respect to the typical densification behaviors, such as the density-strain and density-pressure relations. It was revealed that densification of 2D MPFEM model could be relatively easier than 3D model for our case. Finally, validated by the experimental results, 3D MPFEM model generated more realistic predictions than 2D model, in terms of the final green density’s dependence on both the true strain and Em. The reasons were briefly explained by the discrepancies in both the particles’ degrees of freedom and the initial packing density.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 57-65
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of High-Temperature Annealing on the Cross-Tension Property of Resistance Spot Welded Medium-Mn Steel
    Autorzy:
    Zhao, Bingge
    Wang, Yuanfang
    Sun, Chenyu
    Ding, Kai
    Wu, Guanzhi
    Wei, Tao
    Pan, Hua
    Gao, Yulai
    Powiązania:
    https://bibliotekanauki.pl/articles/2174565.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    medium Mn steel
    resistance spot welding
    cross-tension strength
    martensite
    fracture
    Opis:
    As one of the most promising 3rd generation advanced high strength steels (AHSS), medium Mn steels attract much attention because of their exceptional mechanical property and reasonable cost. However, their application in the modern automotive industry is limited by poor weldability. In this study, 7Mn steel was welded by resistance spot welding (RSW), which was followed by high-temperature annealing to increase the cross-tension property. With this effort, enhanced cross-tension strength (CTS) with a partial interfacial fracture (PIF) mode was realized. During the annealing after RSW that produced martensite, austenitization was realized and then evolved into martensite by the following air cooling. This process produced structure homogeneity across the joint. With respect to the RSW joint, martensite remained the dominant structure after annealing while the diffusion of C and Mn solutes was triggered. With the increase of annealing temperature, the diffusion was enhanced, and the grain boundary embrittlement was reduced, leading to higher CTS.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1293--1298
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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