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Wyszukujesz frazę "matrix method" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
The influence of the configuration of the fiber-metal laminates on the dispersion relations of the elastic wave modes
Autorzy:
Barski, Marek
Muc, Aleksander
Stawiarski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2146565.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
FML
fiber metal laminates
GLARE
elastic wave modes
dispersion curves
stiffness matrix method
laminaty metalowo-włókniste
mody fal sprężystych
krzywa dyspersji
metoda macierzy sztywności
Opis:
The current work is devoted to the determination of dispersion curves for elastic wave modes. The studied elastic waves propagate across metal-fiber hybrid composites. In order to solve the problem, special software has been developed with the use of C++. This software works with the MS Windows operating system and the proposed solution is based on the multi-threading mechanism. It makes possible to significantly speed up the calculations. The relatively new approach is used namely the stiffness matrix method. At the very beginning, the dispersion curves are determined for the traditional composite materials of cross-ply configuration, for which the layers are made of glass fiber/epoxy resin and carbon fiber/epoxy resin. The impact of the total number of layers on the dispersion curves is investigated. Next, the influence of the thickness of the layers, which are made of aluminum alloy, on the dispersion characteristic is studied. In the second case, it is assumed that the total thickness of the composite material wall for all cases is identical.
Źródło:
Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020202
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental verification of similarity criteria for sound absorption of simple metamaterials
Autorzy:
Chojak, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/2202415.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
scale model
scale model test
MES
transfer matrix method
TMM
sound absorption coefficient
model redukcyjny
test modelu redukcyjnego
metoda macierzy przejścia
współczynnik pochłaniania dźwięku
Opis:
The paper concerns the dimensional analysis of simple acoustic metamaterials and its experimental verification in a computer model. Due to their decreased thickness possible because of the thermoviscous losses and sound dispersion that occur in acoustic metamaterials, such structures are gaining popularity, both as sound absorbers and diffusers. This implies the need to find their equivalents to be used at scale - both for modeling interiors with metamaterials and developing more complicated structures. The paper discusses the dimensional analysis performed for a generalized unit cell of a metamaterial with a resonator. The dimensional analysis shows the need for scaling both the geometrical dimensions of the structure and the parameters of the medium - air. The dimensional analysis was derived based on the transfer matrix method and was proven correct with the finite element method model. The paper also discusses the consequences of neglecting the air criteria, which are impossible to be fulfilled. This opens the question of finding new criterial numbers allowing the correct reflection of acoustic metamaterials at scale.
Źródło:
Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022211
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the influence of airflow resistance of layered porous structures on the sound absorption coefficient
Autorzy:
Flach, Artur
Powiązania:
https://bibliotekanauki.pl/articles/24201972.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
airflow resistance
anechoic wedges
transfer matrix method
optimization
PSO
particle swarm optimization
opór przepływu powietrza
kliny akustyczne
metoda macierzy przejścia
optymalizacja
optymalizacja roju cząstek
Opis:
The paper presents the research on the influence of airflow resistance on the sound absorption coefficient of layered porous structures. For the calculation of the sound absorption coefficient, the models of layered sound-absorbing structures were developed with the use of numerical computational models. Using the developed models, optimization was carried out to maximize the average sound absorption coefficient of the structures for a given frequency range. As a result of the research, the dependence of the change in airflow resistance for the successive layers of the material was determined. The results of the work will be particularly useful in the design of wedges used in anechoic chambers.
Źródło:
Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022311
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the scattering matrix method to evaluate acoustic mufflers properties
Autorzy:
Gorazd, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2202431.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
cylindrical duct
reflective muffler
scattering matrix
multi-port method
kanał cylindryczny
tłumik refleksyjny
macierz rozproszenia
metoda wieloportowa
Opis:
The aim of the paper is to analyse acoustic reflective muffler applying the scattering matrix method. In general, the method is based on dividing the muffler/system into separate subsystems and apply the acoustic multi-ports theory to calculate the scattering matrix of each element to finally combine the results and obtain the scattering matrix of the entire system/muffler. The multi-port procedure is derived from the theory of electric networks and allows to analyse acoustic devises of complex geometry with prescribed accuracy. Based on the scattering matrix, the transmission loss was determined.
Źródło:
Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022204
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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