Temat: Sommerfeld - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Electromagnetic Signal Propagation in a Lorentz Dispersive Medium
Autorzy:: Ciarkowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/226239.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: dispersion
Sommerfeld precursor
Brillouin precursor
Opis:: This work is concerned with the propagation of rapidly oscillating electromagnetic (EM) signal in a Lorentz dispersive medium. The problem considered here is 1-dimensional and its exact solution is described by a contour integral defined in a complex frequency plane. With the use of uniform asymptotic techniques, approximate representation for the total field consisting of the Sommerfeld and Brillouin precursors and the main signal is obtained. The effect of the rate of envelope changes, as well as of carrier frequency on the shape of the total signal is examined.
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 3; 251-255
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Dynamical jump attenuation in a non-ideal system through a magnetorheological damper
Autorzy:: Piccirillo, V.
Tusset, A. M.
Balthazar, J. M.
Powiązania:: https://bibliotekanauki.pl/articles/280364.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: magnetorheological damper
Sommerfeld effect
nonlinear dynamics
Opis:: This paper is concerned with the Sommerfeld effect (Jump phenomena) attenuation in an non-ideal mechanical oscillator connected with an unbalanced motor excitation with a limited power supply (non-ideal system) using a magnetorheological damper (MRD). The dynamical response of systems with MRD presents different behavior due to their nonlinear characteristic. MRD nonlinear response is associated with adaptive dissipation related to their hysteretic behavior. The Bouc-Wen mathematical model is used to represent the MRD behavior. Numerical simulations show different aspects about the Sommerfeld effect, illustrating the influence of the different electric current applied in the MRD to control the force developed by this damper.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 595-604
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Multi-core and many-core SPMD parallel algorithms for construction of basins of attraction
Autorzy:: Silveira, Marcos
Gonçalves, Paulo J.P.
Balthazar, José M.
Powiązania:: https://bibliotekanauki.pl/articles/281668.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: basins of attraction
MPI
CUDA
Duffing equation
Sommerfeld effect
mmunodynamics
Opis:: Construction of basins of attraction, used for the analysis of nonlinear dynamical systems which present multistability, are computationaly very expensive. Because of the long runtime needed, in many cases, the construction of basins does not have any practical use. Numerical time integration is currently the bottleneck of algorithms used for the construction of such basins. The integrations related to each set of initial conditions are independent of each other. The assignment of each integration to a separate thread seems very attractive, and parallel algorithms which use this approach to construct the basins are presented here. Two versions are considered, one for multi-core and another for many-core architectures, both based on a SPMD approach. The algorithm is tested on three systems, the classic nonlinear Duffing system, a non-ideal system exhibiting the Sommerfeld effect and an immunodynamic system. The results for all examples demonstrate the versatility of the proposed parallel algorithm, showing that the multi-core parallel algorithm using MPI has nearly an ideal speedup and efficiency.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 1067-1079
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: On a nonlinear and chaotic non-ideal vibrating system with shape memory alloy (SMA)
O nieliniowym, chaotycznym i nieidealnym układzie drgającym z elementami wykazującymi efekt pamięci kształtu
Autorzy:: Piccirillo, V.
Balthazar, J. M.
Pontes, B. R. Jr.
Felix, J. L. P.
Powiązania:: https://bibliotekanauki.pl/articles/280905.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: pamięć kształtu
chaos
efekt Sommerfelda
shape memory
nonlinear dynamics
Sommerfeld effect
Opis:: In this paper, we present nonlinear dynamic behaviour of a system which consists of a mass connected to a rigid support by a shape memory alloy (SMA) element and a damper. In order to disturb the system, a DC motor with limited power supply is connected to the mass, causing an interaction between the vibrating structure and the energy source. The SMA element is characterised using a one-dimensional phenomenological constitutive model, based on the classical Devonshire theory. We analyse the non-ideal system in form of two coupled nonlinear differential equations. Some interesting nonlinear phenomena as the Sommerfeld effect and nonlinear resonance including periodic, chaotic and hyperchaotic regime are presented.
W pracy przedstawiono opis dynamiki nieliniowego układu złożonego z masy połączonej ze sztywnym podłożem za pośrednictwem elementu z pamięcią kształtu i tłu- mikiem. W celu realizacji wymuszenia w układzie zastosowano silnik prądu stałego z ograniczonym poborem mocy, który pobudza do ruchu masę, tworząc w ten sposób sprzężenie mechaniczne pomiędzy układem drgającym a źródłem energii. Element z pamięcią kształtu opisano za pomocą jednowymiarowego modelu fenomenologicznego opartego na teorii Devenshire’a. Przeanalizowano rozważany nieidealny układ opisany dwoma sprzężonymi nieliniowymi równaniami ruchu. Zaobserwowano i opisano interesujące zjawiska nieliniowe w postaci efektu Sommerfelda i nieliniowego rezonansu w zakresie drgań okresowych, chaotycznych i hiperchaotycznych.
Źródło:: Journal of Theoretical and Applied Mechanics; 2008, 46, 3; 597-620
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of ideal and non-ideal excitation sources on the dynamics of a nonlinear vibro-impact system
Autorzy:: Moraes, F. H.
Pontes, B. R. (jr)
Silveira, M.
Balthazar, J. M.
Brasil, R. M. L. R. F.
Powiązania:: https://bibliotekanauki.pl/articles/281540.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: vibro-impact system
limited power supply
non-ideal excitation
Sommerfeld effect
Opis:: The objective of the present work is to analyze the dynamics of a vibro-impact system consisting of two blocks of different mass coupled by a spring with two stages. Two different types of excitation sources for the system are used in the analysis: the first is an ideal excitation in form of a harmonic force, and the second is a non-ideal excitation in form of a DC electric motor with limited power supply which has an unbalanced rotor. The control parameter for both situations is the excitation frequency of the system. The analysis includes time histories of displacements and velocities, phase portraits and diagrams of the displacement and frequency, used to show the Sommerfeld effect. For certain values of the parameters of the system, the motion is chaotic. The mathematical model of the system is used to obtain an insight to the global dynamics of the vibro-impact system. The model with a non-ideal excitation is more realistic, complete and complex than the model with the ideal excitation.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 763-774
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effects of the control parameters on the stability of a laminar boundary layer on a porous flat plate
Autorzy:: Lihonou, T. F.
Monwanou, A. V.
Miwadinou, C. H.
Chabi Orou, J. B.
Powiązania:: https://bibliotekanauki.pl/articles/2174178.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: przepuszczalność
liczba Reynoldsa
metoda kolokacji
permeability parameter
small Reynolds number
linear temporal stability
boundary layer
modified Orr-Sommerfeld equation
spectral collocation method
Opis:: This work is devoted to the analysis of the linear temporal stability of a laminar dynamic boundary layer on a horizontal porous plane plate. The basic flow is assumed to be laminar and two-dimensional. The basic flow velocity profiles are obtained by numerically solving the Blasius equation using the Runge-Kutta method. The perturbations of these basic solutions are expressed in the form of three-dimensional Tollmien-Schlichting waves. The formulation of the stability problem leads to the Orr-Sommerfeld equation modified by the permeability parameter (Darcy number) and the small Reynolds number. This equation is given in a general form which can be applied to the Chebyshev domain and the boundary layer domain and solved numerically using the Chebyshev spectral collocation method. The marginal stability diagrams, the critical Reynolds numbers and the eigenvalue spectra are obtained for different values of the parameters which have modified the stability equation. Numerical solutions indicate the importance of the effect of these parameters on the flow stability characteristics.
Źródło:: International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 113--127
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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