Temat: sound diffusion - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Comprehensive Research of the Road Acoustic Screen with Absorbing and Diffusing Surface
Autorzy:: Kamisiński, T.
Kinasz, R.
Szeląg, A.
Rubacha, J.
Pilch, A.
Flach, A.
Baruch, K.
Powiązania:: https://bibliotekanauki.pl/articles/177952.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: acoustics
mechanical strength
environmental actions
sound reflection
sound diffusion
Opis:: The paper presents the new solution to a road acoustic screen consisting of elements which are highly diffusing and simultaneously resistant to weathering, but also characterised by a sound absorption. There is described the comprehensive research of such the road acoustic screen with absorbing and diffusing surface. The study includes screen’s resistance to wind load and snow removal, impact tests and measurements of some acoustic parameters.
Źródło:: Archives of Acoustics; 2015, 40, 1; 137-144
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of the possibility of shaping the sound diffusion coefficient of diffusers based on acoustic metamaterials
Autorzy:: Rubacha, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/2202416.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: metamaterial
sound diffusion
diffusion coefficient
metamateriał
dyfuzja dźwięku
współczynnik dyfuzji
Opis:: The article presents the analysis of the possibilities of using acoustic metamaterial to build sound diffusers. The diffusers composed of slots loaded with a curved quarter-wave resonator were investigated. Such solutions induce dispersion and the slow sound effect to increase the effective depth of the quarter-wave resonator. The sound diffusion coefficient was calculated with the use of numerical models of diffusers. Next, obtained results were compared with the Schroeder diffuser. In conclusion, it was shown, that acoustic metamaterials affect the frequency band of the diffuser and the effectiveness of the obtained sound diffusers depend on relative width of slits.
Źródło:: Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022210
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Sound diffuser made of acoustic metamaterial: numerical and experimental investigation
Autorzy:: Rubacha, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/2146653.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: metamaterial
sound diffusion
diffusion coefficient
metamateriał
dyfuzja dźwięku
współczynnik dyfuzji
Opis:: The use of metamaterials in room acoustics is becoming more and more popular. Their advantage is the possibility of adjusting the parameters of the systems in the desired frequency range and the reduction of dimensions compared to the existing solutions. This paper discusses the numerical design and experimental verification of sound diffuser based on the acoustic metamaterials: a slit with added quart-wave length resonator. The transfer matrix method is used to make a numerical model of the metamaterial cell, which was used to build a model of a diffuser composed of N = 7 cells. Then, the dimensions of the diffuser were optimized to obtain the sound diffusion in a wide frequency range. The sound dispersion coefficient was also calculated using the FEM method. The numerical results were compared with the measurements and it was shown that it is possible to make a broadband sound diffuser with the use of metamaterials.
Źródło:: Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021207
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Identification of Sound Power Levels and Surface Absorption Coefficients in Multi-Source Industrial Buildings by Using a Simplified Diffusion Model
Autorzy:: Sequeira, M. E.
Cortínez, V. H.
Powiązania:: https://bibliotekanauki.pl/articles/177679.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: industrial noise
noise source identification
sound absorption coefficient
two-dimensional acoustic diffusion model
simulated annealing algorithm
Opis:: This article deals with the identification of sound powers and absorption surface coefficients in multisource industrial buildings from the knowledge of the sound pressure levels (SPLs) at several monitoring points. This inverse problem is formulated as one of optimisation in which the objective function is the difference between the measured and predicted SPLs. The methodology combines the use of a simplified acoustic diffusion model with the simulated annealing optimisation technique. The former is a recently developed model for estimating the SPLs in a fast and sufficiently accurate form. The low computational cost of the model constitutes the major advantage for the optimisation procedure due to the great numer of simulations required. Numerical examples are given to show the efficiency of the proposed approach.
Źródło:: Archives of Acoustics; 2018, 43, 1; 93-102
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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