Autor: Stręk, T. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Forced response of plate with viscoelastic auxetic dampers
Autorzy:: Stręk, T.
Tematy:: auxetic
viscoelastic
damper
finite element method
auksetyki
lepkosprężystość
tłumik
metoda elementów skończonych; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/127993.pdf Link otwiera się w nowym oknie
Źródło:: Vibrations in Physical Systems; 2018, 29; 1-9
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Opis:: The example studies a forced response of plate with viscoelastic auxetic damper located at the free end of the plate. Damping elements consist of the cover layer and layer of viscoelastic material with positive or negative Poisson's ratio. Viscoelastic materials are often used for reduction of vibration (seismic or wind induced vibrations in building structures or other structures). The common feature is that the frequency of the forced vibrations is low. Calculations are made using finite element method with Comsol Multiphysics software.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Computational modelling of vibrations transmission loss of auxetic lattice structure
Autorzy:: Idczak, E.
Stręk, T.
Tematy:: auxetics
negative Poisson's ratio
dynamic analysis
VTL factor
auksetyki
ujemny współczynnik Poissona
analiza dynamiczna
współczynnik utraty przewodzenia drgań; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/127808.pdf Link otwiera się w nowym oknie
Źródło:: Vibrations in Physical Systems; 2016, 27; 123-128
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Opis:: In this article dynamical properties of auxetic lattice structures will be analysed. Auxetic structures are materials, which have negative Poisson’s ratio and some of these have got specific dynamic properties. Their dynamic behaviour in the frequency domain will be also shown in this article. The possibility of isolation of auxetics will show the factor VTL – Vibration Transmission Loss.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Finite element analysis of dynamic properties of thermally optimal two-phase composite structure
Autorzy:: Nienartowicz, M.
Stręk, T.
Tematy:: topology optimization
SIMP model
SNOPT
internal energy
optymalizacja topologii
model SIMP
energia wewnętrzna; Pokaż więcej
Data publikacji:: 2014
Powiązania:: https://bibliotekanauki.pl/articles/128202.pdf Link otwiera się w nowym oknie
Źródło:: Vibrations in Physical Systems; 2014, 26; 203-210
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Opis:: This paper presents modelling and a FEM analysis of dynamic properties of a thermally optimal two-phase composite structure. Simulations were provided for 2D models. At the first step, topology optimization was performed, where an internal energy was minimized. At the second step, analysis of dynamic properties was executed. Calculations allowed to determine eigenfrequencies and the mode shape of the structure. Solid isotropic material with penalization (SIMP) model was used to find the optimal solution. The optimization algorithm was based on SNOPT method and Finite Element Method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Fatigue life of polymer dental crown
Autorzy:: Michalski, J.
Stręk, T.
Tematy:: fatigue
modal
vibrations
dental crown
polymers
acrylic
finite element method
zmęczenie materiału
modalność
drgania
korona protetyczna
polimery
akryl
metoda elementów skończonych; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/127698.pdf Link otwiera się w nowym oknie
Źródło:: Vibrations in Physical Systems; 2018, 29; 1-8
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Opis:: In this article fatigue life of polymer dental crown will be analyzed. Chewing forces occurring in repetitive cycles can lead to fatigue destruction of material. To predict a number of cycles to failure finite element method can be applied and results may be used to improve the design of acrylic dental crowns. Also, the modal analysis will be performed in order to find natural frequencies of the system and prevent destruction from vibrations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dynamic analysis of optimized two-phase auxetic structure
Autorzy:: Idczak, E.
Stręk, T.
Tematy:: negative Poisson's ratio
auxetics
eigenfrequency
topology optimization
dynamic analysis
ujemny współczynnik Poissona
auksetyki
częstotliwość drgań własnych
optymalizacja topologiczna
analiza dynamiczna; Pokaż więcej
Data publikacji:: 2017
Powiązania:: https://bibliotekanauki.pl/articles/127856.pdf Link otwiera się w nowym oknie
Źródło:: Vibrations in Physical Systems; 2017, 28; 1-12
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Opis:: This paper presents a dynamic analysis of earlier optimized auxetic structure. This optimization based on the distribution of two materials in such way to obtain a minimal value of Poisson’s ratio (PR), which indicates the auxetic properties. The initial optimized shape was so-called star structure, which if is made from one material has the PR close to 0.188. After optimization with the goal function of PR-minimization, the obtained value was equal to -9.5043. Then the eigenfrequencies for the optimized structure were investigated. The calculations were carried out by means of Finite Element Method (FEM). For optimization of the value of Poisson’s ratio was used algorithm MMA (Method of Moving Asymptotes). The computing of single material properties (PR, Young’s modulus, density) for the whole shape was made by means of SIMP method (Solid Isotropic Method with Penalization).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Vibration properties of auxetic beam
Autorzy:: Matuszewska, A.
Stręk, T.
Tematy:: auxetic
vibration transmission loss
Rayleigh's damping
finite element method
auksetyki
zmniejszenie przenoszenia drgań
tłumienie Rayleigha
metoda elementów skończonych; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/127863.pdf Link otwiera się w nowym oknie
Źródło:: Vibrations in Physical Systems; 2018, 29; 1-6
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Opis:: This study presents vibration analysis for a beam with an auxetic cross-section. In order to verify damping properties of auxetic materials, the numerical results were compared with classical H-beam which has basic geometry. The response of analyzed models was considered with taking into account the Rayleigh damping of the internal material structure. Performed calculations comprise deformation of the certain beam, selected points displacement and vibration transmission loss coefficient. The analysis was carried out by means of Finite Element Method using Comsol Multiphysics software.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Spectral Intensities for the Emission |$\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ Γ$\text{}_{8}$〉 → |$\text{}^{4}$I$\text{}_{15}\text{}_{/}\text{}_{2}$ Γ〉in the Cs$\text{}_{2}$NaErCl$\text{}_{6}$
Autorzy:: Acevedo, R.
Soto-Bubert, A.
Navarro, G.
Meruane, T.
Stręk, W.
Tematy:: 32.70.Cs; Pokaż więcej
Data publikacji:: 2004-03
Powiązania:: https://bibliotekanauki.pl/articles/2037134.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2004, 105, 3; 233-251
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: We report explicit vibronic intensity calculations for the |$\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ Γ$\text{}_{8}$> → |$\text{}^{4}$I$\text{}_{15}\text{}_{/}\text{}_{2}$ Γ>excitations in the Cs$\text{}_{2}$NaErCl$\text{}_{6}$ elpasolite-type systems, based upon new and updated experimental data, obtained from optical absorption measurements made at 10 K, in the energy range from 6,000 up to 26,000 cm$\text{}^{-1}$. Our calculation model is a generalization of the vibronic crystal field-ligand polarization method and the calculation is performed using a minimum set of adjustable parameters - all and each of them have a clear physical meaning. Our strategy was chosen so as to make a significant distinction with previous calculations, performed by other authors, who have worked out a model originated from a supra-parameterized scheme, within the framework of the superposition model of Newman. Throughout the course of the current work, it is shown that our model is suitable to handle this kind of calculations and also that the numerical results obtained are in fairly good agreement with experiment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Influence of Silver Surface Structure on Luminescence Characteristics of Europium Doped Polymer Films
Autorzy:: Denisenko, G. A.
Malashkevich, G. E.
Tziganova, T. V.
Galstyan, V. G.
Voitovich, A. P.
Pershukevich, P. P.
Kalosha, I. I.
Bazilev, A. G.
Mchedlishvili, B. V.
Stręk, W.
Oleinikov, V. A.
Tematy:: 78.55.Hx; Pokaż więcej
Data publikacji:: 1996-07
Powiązania:: https://bibliotekanauki.pl/articles/1945485.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 1996, 90, 1; 121-126
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: The luminescence characteristics of Eu$\text{}^{3+}$ ions in Eu(NO$\text{}_{3}$)$\text{}_{3}$·6H$\text{}_{2}$O salt contained in polymer films coating the silver metallic surfaces were studied. The surfaces were specially prepared to consist of silver tip arrays with the height of tips in micron and surface density in 10$\text{}^{-8}$ cm$\text{}^{-2}$ ranges. The evaluation of enhancement per one europium ion gave a value 3.5 10$\text{}^{2}$ for one polymer layer coating of tip array silver surface in comparison with the case of glass substrate coating.
Dostawca treści:: Biblioteka Nauki

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