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    Wyświetlanie 1-5 z 5
    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
    Artykuł
    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
    Artykuł
    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
    Artykuł
    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
    Artykuł
    Tytuł:
    The Effect of Geometrical and Material Modification of Sound Diffusers on Their Acoustic Parameters
    Autorzy:
    Pilch, A.
    Kamisiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/176935.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Schroeder diffusers
    scattering
    diffusion
    absorption
    Opis:
    Sound diffusers, in particular those based on changes in the phase of the reflected wave (Schroeder diffusers), have recently gained greatly in popularity in acoustics as an effective means to eliminate defects and improve the acoustic performance of interiors. This paper draws attention to a possibility of shaping acoustic parameters of sound diffusers and fundamental errors made in applying diffusers. Also, an often neglected issue of sound absorption by diffusers has been tackled. The presented results of laboratory measurements indicate a great significance of the diffusers' rigidity and geometry on their absorption coefficient at low frequencies. The effect of arrangement of elements on the diffusion coefficient was analysed for two types of elements based on the prime number N = 7.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 955-966
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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