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    Wyświetlanie 1-3 z 3
    Tytuł:
    Theoretical and experimental research of supersonic missile ballistics
    Autorzy:
    Zygmunt, B.
    Motyl, K.
    Machowski, B.
    Makowski, M.
    Olejniczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/201046.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    missile exterior ballistics
    mathematical model
    computer simulation
    test range experiment
    pociski balistyczne
    model matematyczny
    symulacja komputerowa
    Opis:
    A mathematical-physical model of a supersonic missile was built, taking into account the mass and inertia properties. The model was implemented in the MathCAD14 simulation program. A numerical analysis of the missile ballistics was conducted and basic parameters were determined: range, altitude, velocity and acceleration, which enabled a test range program for manufactured missile models to be drawn up. Initial flight tests of missiles were carried out at the test range. Satisfactory accordance of experimental and theoretical dynamic parameters of the missile under study was obtained.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 229-233
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Premises of Parametrical Assessment of Turbojet Engine in Flight Regulation Condition During Ground Test
    Autorzy:
    Lindstedt, P.
    Golak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/387321.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    regulacja
    symulacja komputerowa
    silnik odrzutowy
    diagnostyka
    test
    regulation
    computer simulation
    turbine jet engine
    parametric diagnostics
    ground tests
    Opis:
    The article presents the theoretical bases of method, engine technical condition is described by one (in other methods four are used) comprehensive model (binding engine input signals p2 and mp and engine output - n and p4 signals) with unique feature, that engine operation quality during ground tests will provide neccessary data on its performance in flight. The changes occurring in turbojet engine during its exploitation will be measure by comparision of standard model with parameters obtained from experiment (ground test).
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 1; 44-48
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody obliczania napięcia międzyfazowego z symulacji komputerowych
    Methods for calculation interfacial tension from computer simulations
    Autorzy:
    Chrzanowski, J.
    Lamperski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/172418.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    napięcie międzyfazowe
    symulacja komputerowa
    metoda Kirkwooda-Buffa
    metoda Bennetta
    metoda test-area
    układ rozszerzony
    funkcja fali kapilarnej
    metoda kwadratu gradientu
    interfacial tension
    computer simulation
    Kirkwood-Buff method
    Bennetts method
    test-area method
    expanded ensemble simulation
    capillary wave theory
    square gradient theory
    Opis:
    Interfaces have been recently a subject of profound interest for physicists, chemists and biologists because of the processes taking place in the interfacial region like adsorption, catalysis of chemical reactions etc. Computer simulations treat an interface in a full atomic level and by that they are a valuable complementary technique for experiment and theory. In this paper, different methods for the calculation of an interfacial tension by computer simulations are described and compared. The most commonly used method for the interfacial tension calculation was developed by Kirkwood-Buff. It is based on the mechanical route definition. This approach uses normal and tangential pressure components of the pressure tensor. The interfacial tension can be also evaluated through its thermodynamic definition. The method of Bennett defines the interfacial tension as the free energy difference of two (or more) systems relative to the difference in interfacial areas. The “test- -area” method is based upon the perturbation formalism. The test state is obtained from an infinitesimal change of the surface area of the reference system. The third method based on the thermodynamic route used to evaluate the interfacial tension is thought as an expanded ensemble simulation where two systems with different free energy and the interfacial area are connected by a discrete chain of intermediate subsystems. The next approach is based on the capillary wave theory formalism which provides a relationship between the surface tension and the wave width due the capillarity broadening. Interfacial tension may be also computed from the square gradient theory which is based on the expansion of the Hemholtz free energy in the Taylor series around the homogeneous state with the assumption that the molecular gradients in the interface are small compared to intermolecular distance. The theoretical basis, application and results of computer simulations of each method are presented. Aa accuracy of the methods in different simulation methodologies and systems is compared.
    Źródło:
    Wiadomości Chemiczne; 2014, 68, 3-4; 257-278
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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