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    Wyświetlanie 1-7 z 7
    Tytuł:
    Dynamics of Short Recoil-Operated Weapon
    Autorzy:
    Macko, Martin
    Vo, Bien Van
    Mai, Quang Anh
    Powiązania:
    https://bibliotekanauki.pl/articles/2036927.pdf
    Data publikacji:
    2021
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    dynamics
    short-recoil-operated weapons
    Lagrange's equations
    Opis:
    In this article, the authors mentioned the function of short-recoil-operated weapons with a vertical sliding-wedge breechblock. The dynamic simulation was conducted and then the results were compared with the corresponding experimental data to verify reliability of the model. The model is calculated and tested out on the 37 mm twin anti-aircraft gun. Besides, the article presents the effect of some structural parameters on functionality of the automatic weapon. The reported results are an important theoretical basis to determine the rate of fire and the forces acting on the guns. The movement of the breechblock also affects stability of the weapon and can therefore be used to a math model or to simulate the movement of the weapon. Calculated and verified data could be used for the design of an automatic firing system as well as for solving vibration on automatic guns when burst firing.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2021, 12, 3 (45); 9-26
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics and stability of a flexible, slender cylinder flexibly restrained at one end a free at the other and subjected to axial flow
    Dynamika i stabilność giętkiego, smukłego cylindra, z jednym końcem umocowanym sprężyście a drugim swobodnym, w warunkach przepływu osiowego
    Autorzy:
    Kheiri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140336.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamics
    axial flow
    cylinder
    pinned free
    Lagrange's equations
    dynamika
    przepływ osiowy
    mocowanie swobodne
    równania Lagrange'a
    Opis:
    In this paper, Lagrange’s equations along with the Ritz method are used to obtain equation of motion for a flexible, slender cylinder subjected to axial flow. The cylinder is supported only by a translational and a rotational spring at the upstream end, and at the free end, it is terminated by a tapering end-piece. The equation of motion is solved numerically for a system in which the translational spring is infinitely stiff, thus acting as a pin, while the stiffness of the rotational spring is generally non-zero. The dynamics of such a system with the rotational spring of an average stiffness is described briefly. Moreover, the effects of the length of the cylinder and the shape of the end-piece on the critical flow velocities and the modal shapes of the unstable modes are investigated.
    W pracy zastosowano równania Lagrange’a i metodę Ritza by uzyskać równania ruchu giętkiego, smukłego cylindra poddanego działaniu przepływu osiowego. Cylinder umocowany od strony dopływu za pomocą sprężyn translacyjnej i rotacyjnej ma drugi koniec swobodny ze zbieżną końcówką. Równanie ruchu jest rozwiązane numerycznie dla systemu, w którym sprężyna translacyjna ma nieskończoną sztywność i zachowuje się jak kołek, podczas gdy sztywność sprężyny rotacyjnej jest generalnie różna od zera. Opisano krótko dynamikę takiego systemu ze sprężyną rotacyjną o średniej sztywności. Ponadto, badano zależności między długością cylindra i kształtem końcówki a krytycznymi prędkościami przepływu i rozkładami modów niestabilnych.
    Źródło:
    Archive of Mechanical Engineering; 2016, LXIII, 3; 379-396
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A generalized fractional calculus of variations
    Autorzy:
    Odzijewicz, T.
    Malinowska, A. B.
    Torres, D. F. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/205955.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    generalized fractional operators fractional variational analysis
    Euler-Lagrange equations
    natural boundary conditions
    Noether's theorem
    damped harmonic oscillator
    Opis:
    We study incommensurate fractional variational problems in terms of a generalized fractional integral with Lagrangians depending on classical derivatives and generalized fractional integrals and derivatives. We obtain necessary optimality conditions for the basic and isoperimetric problems, transversality conditions for free boundary value problems, and a generalized Noether type theorem.
    Źródło:
    Control and Cybernetics; 2013, 42, 2; 443-458
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of geometrically nonlinear clamped uniform rods and rods with sections varying exponentially free vibration
    Autorzy:
    Abdeddine, E.
    Majid, A.
    Bouzida, N.
    Bouzida, Z.
    Zarbane, Kh.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201031.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    non-linear longitudinal vibration
    Lagrange equations
    harmonic balance method
    linearized approach
    drgania nieliniowe
    drgania podłużne
    równania Lagrange'a
    metoda bilansu harmonicznych
    podejście linearne
    Opis:
    Purpose: The present paper is intended to investigate the problem of linear and non-linear longitudinal free vibration of uniform rods and rods whose cross-sections vary exponentially at large vibration amplitudes. Design/methodology/approach: The method adopted consists in discretizing the energy term on linear kij and non-linear rigidity tensor bijkl, as well as the mass tensor mij. Therefore, the formulation of this structure is based on Lagrange equations and the harmonic balance method so as to obtain the nonlinear algebraic equations. These latter are solved numerically and analytically through the explicit and linearized method. Findings: The response of Clamped-Clamped uniform and non-uniform rods on our structure are highlighted in the amplitude frequency and associated first three mode shapes. Moreover, this research leads to study the influence of the exponential slope on the maximum displacement, thus emphasizing the non-uniform bars usefulness. The obtained results are then compared with the available literature with a view to validating this theory. Research limitations/implications: As a perspective, the method used in this paper would be pushed to study the FDM material, taking into account other parameters related to additive manufacturing, and later to be validated experimentally. Practical implications: Longitudinal vibrations are important in mechanical structures; therefore, the determination of their dynamic behaviour needs to be understood. In the present study, the effect of the displacement amplitude on the exponential slope of the structure was analysed, which led to the determination of the reduction range of the vibration amplitude under resonance. However, this should be taken into account in the design process. Besides, the usefulness of the non-linearity geometric effects was demonstrated to examine these structures by considering all the parameters involved. Originality/value: A linearized procedure is used to solve a nonlinear algebra equation. The use of this method leads to reduce calculation time contrary to iterative methods.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 2; 49--63
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Holonomicity analysis of electromechanical system on the example of simple switched reluctance motor
    Autorzy:
    Wciślik, M.
    Suchenia, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/97399.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    motion equations
    Lagrange function
    nonholonomicity
    power balance
    reluctance motor
    Opis:
    The paper deals with a single-phase reluctance motor used to test the motion equations of an electromechanical system. The identification of the motor electric parameters as a function of the rotation angle of the rotor was carried out using AC 50 Hz voltage source. A mechanical part of the system was designed as a physical pendulum containing the motor rotor and a metal bar mounted on the rotor axis. The parameters of the mechanical part were measured during the pendulum oscillations. The work presents the characteristics and motion equation parameters of the motor dynamics. The reluctance motor motion equation does not fullfil the power balance. The parameters of the motion equations obtained from the experiment and from the second order Lagrange’a equations are compared. The derivation of motion equation, together with a discussion of holonomicity of electromechanical systems is also presented.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 330-339
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of long time simulation of Hamilton and Lagrange geometry dynamical models of a multibody system
    Autorzy:
    Bai, Long
    Ge, Xinsheng
    Xia, Lili
    Powiązania:
    https://bibliotekanauki.pl/articles/2200827.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    double pendulum
    Lie group
    double spherical space
    Lagrange
    Hamilton equations
    Opis:
    The geometry dynamical modeling method for a double pendulum is explored with the Lie group and a double spherical space method. Four types of Lagrange equations are built for relative and absolute motion with the above two geometry methods, which are then used to explore the influence of different expressions for motion on the dynamic modeling and computations. With Legendre transformation, the Lagrange equations are transformed to Hamilton ones which are dynamical models greatly reduced. The models are solved by the same numerical method. The simulation results show that they are better for the relative group than for the absolute one in long time simulation with the same numerical computations. The Lie group based result is better than the double spherical space one.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 687--704
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MODERNIZATION OF MEANS FOR ANALYSES AND SOLUTION OF NONLINEAR PROGRAMMING PROBLEMS
    Autorzy:
    Trunov, Alexandr
    Powiązania:
    https://bibliotekanauki.pl/articles/452913.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
    Tematy:
    optimization strategies
    NLP
    quantitative criterion-indicator
    new Lagrange function
    source of additional equations.
    Opis:
    The problems of optimization for nonlinear programming (NLP) with constraints inequalities are considered. Definition of condition-indicator as quantitative criterion of the properties of Lagrange function is justified. Application of indicator to increasing degree of completeness for system in NLP for finance and business problems with constraints inequalities are obtained. The new Lagrange function with square of each component of vector Lagrange multipliers for nonlinear objective function simultaneously with criterion-indicator as a source of additional equations is investigated. The conditions, in which the dimensionality of the vector of strategies and the number of constraints doesn’t effects on the uniqueness of the optimization problem solution is received and discussed.
    Źródło:
    Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 2; 133-141
    2082-792X
    Pojawia się w:
    Metody Ilościowe w Badaniach Ekonomicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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