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Wyszukujesz frazę "Lagrange equations" wg kryterium: Wszystkie pola


Wyświetlanie 1-14 z 14
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:
Application of the Lagrange-Sylvester formula to computation of the solution to state equations of fractional linear systems
Autorzy:
Kaczorek, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2086827.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computation
solution
formula Lagrange-Sylvester
fractional
continuous-time
discrete-time
linear
system
obliczenia
rozwiązanie
formuła Lagrange-Sylvester
czas ciągły
czas dyskretny
liniowy
Opis:
The Lagrange-Sylvester formula is applied to the computation of the solutions of state equations of fractional continuous-time and discrete-time linear systems. The solutions are given as finite sums with their numbers of components equal to the degrees of the minimal characteristics polynomials of state matrices of the systems. Procedures for computations of the solutions are given and illustrated by numerical examples of continuous-time and discrete-time fractional linear systems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136729, 1--5
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Lagrange-Sylvester formula to computation of the solution to state equations of fractional linear systems
Autorzy:
Kaczorek, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2128136.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computation
solution
formula Lagrange-Sylvester
fractional
continuous-time
discrete-time
linear
system
obliczenie
rozwiązanie
formuła Lagrange-Sylvester
czas ciągły
czas dyskretny
liniowy
Opis:
The Lagrange-Sylvester formula is applied to the computation of the solutions of state equations of fractional continuous-time and discrete-time linear systems. The solutions are given as finite sums with their numbers of components equal to the degrees of the minimal characteristics polynomials of state matrices of the systems. Procedures for computations of the solutions are given and illustrated by numerical examples of continuous-time and discrete-time fractional linear systems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136729, 1--5
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
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:
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:
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:
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:
Linear differential equations of second, third, and fourth order
Autorzy:
Hernández-Galeana, A.
López-Bonilla, J.
López-Vázquez, R.
Vidal-Beltrán, S.
Powiązania:
https://bibliotekanauki.pl/articles/1167198.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Abel-Liouville-Ostrogradski identity
Euler-Lagrange method
Linear differential equation
Opis:
We study the linear differential equations of second, third, and fourth order, accepting to know solutions of the corresponding homogeneous equation, then we show how to obtain one more solution for the homogeneous case and a particular solution for the original equation.
Źródło:
World Scientific News; 2018, 105; 225-232
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of dynamics of a wheeled mobile robot with mecanum wheels with the use of Lagrange equations of the second kind
Autorzy:
Hendzel, Z.
Rykała, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/266008.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wheeled mobile robots
mecanum wheels
mathematical model
robot mobilny
model matematyczny
dynamika obiektu
Opis:
The work presents the dynamic equations of motion of a wheeled mobile robot with mecanum wheels derived with the use of Lagrange equations of the second kind. Mecanum wheels are a new type of wheels used in wheeled mobile robots and they consist of freely rotating rollers attached to the circumference of the wheels. In order to derive dynamic equations of motion of a wheeled mobile robot, the kinetic energy of the system is determined, as well as the generalised forces affecting the system. The resulting mathematical model of a wheeled mobile robot was generated with the use of Maple V software. The results of a solution of inverse and forward problems of dynamics of the discussed object are also published.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 81-99
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
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
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:
Numerical study for fractional Euler-Lagrange equations of a harmonic oscillator on a moving platform
Autorzy:
Baleanu, D.
Blaszczyk, T.
Asad, J.
Alipour, M.
Powiązania:
https://bibliotekanauki.pl/articles/1158911.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.Jh
02.60.Nm
02.10.Ud
02.30.Vv
Opis:
We investigate the fractional harmonic oscillator on a moving platform. We obtained the fractional Euler-Lagrange equation from the derived fractional Lagrangian of the system which contains left Caputo fractional derivative. We transform the obtained differential equation of motion into a corresponding integral one and then we solve it numerically. Finally, we present many numerical simulations.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 688-691
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periodic solutions of Euler-Lagrange equations with sublinear potentials in an Orlicz-Sobolev space setting
Autorzy:
Acinas, Sonia
Mazzone, Fernando
Powiązania:
https://bibliotekanauki.pl/articles/747300.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Periodic solution
Orlicz-Sobolev spaces
Euler-Lagrange
\(N\)-function
critical points
Opis:
In this paper, we obtain existence results of periodic solutions of hamiltonian systems in the Orlicz-Sobolev space \(W^1L^\Phi([0,T])\). We employ the direct method of calculus of variations and we consider  a potential  function \(F\) satisfying the inequality \(|\nabla F(t,x)|\leq b_1(t) \Phi_0'(|x|)+b_2(t)\), with \(b_1, b_2\in L^1\) and  certain \(N\)-functions \(\Phi_0\).
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2017, 71, 2
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variational equations on the Möbius strip
Variační rovnice na Möbiově pásce
Autorzy:
Urban, Z.
Volná, J.
Powiązania:
https://bibliotekanauki.pl/articles/113594.pdf
Data publikacji:
2017
Wydawca:
STE GROUP
Tematy:
Lagrangian
Euler-Lagrange equation
Helmholtz conditions
fibered manifold
Möbius strip
równanie Eulera-Lagrange'a
warunki Helmholtza
wstęga Möbiusa
Opis:
In this paper, systems of second-order ordinary differential equations (or dynamical forms in Lagrangian mechanics), induced by the canonical embedding of the two-dimensional Möbius strip into the Euclidean space, are considered in the class of variational equations. For a given non-variational system, the conditions assuring variationality (Helmholtz conditions) for the induced system on the Möbius strip are formulated. The theory contributes to variational foundations of geometric mechanics.
V tomto clánku je studována variacnost systému obycejných diferenciálních rovnic (dynamických forem v geometrické mechanice) druhého rádu, kterou indukuje kanonické vložení dvojrozmerné Möbiovy pásky do Euklidova prostoru. Pro daný nevariacní systém rovnic jsou formulovány nutné a postacující podmínky variacnosti (Helmholtzovy podmínky). Práce je príspevkem k variacním základum geometrické mechaniky na Möbiove pásce.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2017, 6, 4; 325-333
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-14 z 14

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