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    Wyświetlanie 1-4 z 4
    Tytuł:
    Modelling of influence of mechanical stresses arising in magnetic circuit on magnetizing characteristic
    Autorzy:
    Idziak, Paweł
    Kowalski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/140929.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modelling
    coupled phenomena
    magnetized characteristics
    mechanical stress (MS)
    Opis:
    An algorithm of determination of mechanical stresses and deformations of the magnetic circuit shape, caused by forces of magnetic origin, is presented in this paper. The mechanical stresses cause changes of magnetizing characteristics of the magnetic circuit. The mutual coupling of magnetic and mechanical fields was taken into account in the algorithm worked out. A computational experiment showed that it was possible to include the interaction of both fields into one numerical model. The elaborated algorithm, taking into account the impact of mechanical stresses on magnetic parameters of construction materials, can be used in both the 2D and the 3D type field-model.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 1; 209-220
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elements of the model positioning of aircraft on the apron
    Autorzy:
    Gołda, Paweł
    Kowalski, Miroslaw
    Wasser, Cezary
    Dygnatowski, Paweł
    Szporka, Aleksander
    Powiązania:
    https://bibliotekanauki.pl/articles/224227.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    airport
    aircraft traffic management
    traffic organization
    aircraft operation
    airport processes
    simulation tools
    lotnisko
    zarządzanie ruchem lotniczym
    organizacja ruchu
    operacje lotnicze
    symulacja
    Opis:
    The design of airports and the organization of their work requires the recognition of the basic components of the air transport process, consisting of an "aerial" part, including the landing phase and the landing operation itself, as well as take-off, the "ground" part, including the task of taxiing aircraft on apron, ground handling tasks, "terminal" part, including passenger handling tasks. These elements form a cause-and-effect sequence, or a series-parallel structure that determines the quality of services provided by the airport, their efficiency, reliability and price. The article presents the issues of decision support for the operation and maintenance of airport infrastructure and traffic management on the ramp and within the airport, i.e. the operation of allocating aircraft to the gates of "gates" using simulation tools. Aircraft taxiing operations on the tarmac integrate the flight phase (along with its components and its problems, such as arriving and departing sequencing) with the ground handling phase of aircraft and passengers at terminals. The model presented in the article is a single element of a holistic approach to the operation of an airport. The overall model consists of the development of decision models for the organization of aircraft traffic on the apron, algorithms for their solution and the possibility of practical application as a simulation tool for analyzing and assessing aircraft traffic processes in the take-off, taxiing and landing phase. To describe the model, a formal mapping of the structure of the necessary airport elements was proposed. A formal record of boundary conditions and criteria relevant to aircraft allocation processes is presented due to the minimization of travel time of passengers transferring between two aircraft assigned to two different gates. Test results can be used in practice, among others by airspace controllers and airport designers for: analyzing and assessing the possibilities of increasing airport capacity, analyzing and assessing the determination of taxiway lengths, maintaining high safety reserves, etc.
    Źródło:
    Archives of Transport; 2019, 51, 3; 101-108
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Characterization and Properties of Al/Fe Multi-Layer Composites Produced by Hot Pressing
    Autorzy:
    Kowalski, Wojciech
    Paul, Henryk
    Mania, Izabela
    Petrzak, Paweł
    Czaja, Paweł
    Chulist, Robert
    Góral, Anna
    Szlezynger, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2203732.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe/Al multilayered composite
    intermetallic phase
    electron microscopy
    microhardness test
    Opis:
    This study aimed to develop Fe/Al multilayered metallic/intermetallic composites produced by hot pressing under an air atmosphere. Analyses were carried out on the composite plates made up of alternatively situated sheets of AA1050 aluminum alloy and DN04 low carbon steel, which were annealed at 903 K for 2, 5, and 10 h. Annealing was performed to obtain reaction layers of distinct thickness. The samples were examined using X-Ray diffraction and scanning and transmission electron microscope equipped with an energy-dispersive X-Ray spectrometer. To correlate the structural changes with mechanical properties, microhardness measurements in near-the-interface layers were performed. All the reaction layers grew with parabolic kinetics with η-Al5Fe2 intermetallic phase as the dominant component. After annealing for 5 and 10 hours, a thin sublayer of θ-Al13Fe4 phase was also detected.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 137--144
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Hot Pressing on the Microstructure of Multi-Layered Ti/Al Composites
    Autorzy:
    Kowalski, Wojciech
    Paul, Henryk
    Petrzak, Paweł
    Maj, Łukasz
    Mania, Izabela
    Faryna, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2049145.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti/al multilayers
    electron microscopy
    impact test
    Opis:
    Metal-intermetallic layered (MIL) composites attract considerable attention due to their remarkable structural and ballistic performance. This study aimed to develop a Ti/Al-based multilayered MIL material by adding ceramic powders, since they can improve the composite’s impact resistance. To this end, an experiment was conducted which a stack of alternating Ti and al sheets bonded by hot pressing; Ti/Al multilayers containing additional layers of Al2O3 and SiC powders were also produced. The samples obtained were examined using electron microscopy techniques. The clads’ mechanical properties were investigated using a Charpy hammer. In the reaction zone, only one intermetallic phase occurred: the Al3Ti phase. The model with an additional Al2O3 layer showed the highest impact energy. none of the Ti/Al clads broke during the Charpy impact test, a result proving their high ductility.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1149-1156
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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