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    Wyświetlanie 1-7 z 7
    Tytuł:
    The Study of Sound Scattering Structures for the Purposes οf Room Acoustic Enhancement
    Autorzy:
    Kamisiński, T.
    Rubacha, J.
    Pilch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537465.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.20.Fn
    43.55.Br
    43.58.+z
    Opis:
    Acoustic structures are currently classified mainly in terms of their acoustic absorption and insulation properties. Knowing the sound scattering parameter can significantly improve the useful value of materials and identify their best applications. Currently no studies are performed in Poland on the sound scattering coefficients of materials. This is due to a complex measurement procedure and a lack of legal requirements. The authors have attempted to make such measurements on the basis of the standard ISO 17497-1:2004: Acoustics - Sound-scattering properties of surfaces - Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room. Measurement and calculation methods are presented, and problems encountered during this study have been described. This issue is of particular importance, especially in the acoustic design of interiors.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 83-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of the Sound Absorption Coefficient of Auditorium Seats for Various Geometries of the Samples
    Autorzy:
    Rubacha, J.
    Pilch, A.
    Zastawnik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176676.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound absorption
    room acoustics
    modelling of acoustic parameters
    Opis:
    This paper presents the results of measurements of the sound absorption coefficient of auditorium seats carried out in the laboratory using two methods. In the first one, small blocks of seats in various arrangements were studied in a reverberation chamber to determine the absorption coefficient of an auditorium of infinite dimensions. The results were compared to the values of the absorption coefficient measured using the second method, which involved samples enclosed within a frame screening the side surfaces of other auditorium blocks. The results of both methods allowed for the assessment of the sound absorption coefficient of an auditorium of any dimensions while taking into account the sound absorption by the side surfaces. The method developed by the authors will simplify the currently known measurement procedures.
    Źródło:
    Archives of Acoustics; 2012, 37, 4; 483-488
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekran akustyczny z powierzchnią dyfuzyjną
    Acoustic Screen with Diffusion Surface
    Autorzy:
    Kamisiński, T.
    Flach, A.
    Rubacha, J.
    Pilch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/143539.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
    Tematy:
    drogi
    hałas
    ekrany
    dyfuzja
    roads
    noise
    screens
    diffusion
    Opis:
    Ekrany akustyczne mogą odbijać, pochłaniać lub rozpraszać dźwięki. Ekran ze specjalnie zaprojektowaną powierzchnią dyfuzyjną ma wysoki stopień rozpraszania dźwięku. Ma również możliwość pochłaniania dźwięku dzięki komorom i systemem perforacji. Te właściwości umożliwiają zastosowanie ekranu do ochrony przed hałasem drogowym.
    Acoustic screen can reflect, absorb or scatter a sound. Screen with especially designed diffusion surface gives high degree of sound scattering. It has also possibility of sound absorbing by mean of cells and perforation system. These characteristic features make possible the use of such screen for protection against road noise.
    Źródło:
    Drogownictwo; 2010, 12; 416-418
    0012-6357
    Pojawia się w:
    Drogownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test Signal Selection for Determining the Sound Scattering Coefficient in a Reverberation Chamber
    Autorzy:
    Kamisiński, T.
    Brawata, K.
    Pilch, A.
    Rubacha, J.
    Zastawnik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176622.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Schroeder diffusers
    scattering
    MLS
    sine sweep
    Opis:
    The paper focuses on the problem of test signal selection in determining the sound scattering coefficient in accordance with ISO 17497-1. Research shows that the use of MLS signal is preferred in this procedure. The sine sweep signal, despite its advantages, presents certain limitations if the sample is moving during measurement. An attempt has been made to develop a method that allows for minimization of error, demonstrating the dependence of the obtained values of the sound scattering coefficient on the rotational speed of the turntable and type of test signal. Conditions for the application of the sine sweep signals in continuous and discrete measurements were defined.
    Źródło:
    Archives of Acoustics; 2012, 37, 4; 405-409
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sound Diffusers with Fabric Covering
    Autorzy:
    Kamisiński, T.
    Brawata, K.
    Pilch, A.
    Rubacha, J.
    Zastawnik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176693.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fabric covering
    Schroeder diffusers
    absorption
    scattering
    Opis:
    Fabric covering is often used by designers, as it can easily mask acoustic structures that do not match an interior. However, in the case of sound diffusers based on change in the phase of the reflected wave, the use of fabric covering is not without its effect on acoustics. It reduces the effectiveness of these structures and raises acoustic absorption. In the paper, the authors analyzed the acoustical properties of a selected fabric used to cover sound diffusers. Sound absorption and scattering coefficients for a system composed of sound diffusers and a fabric situated at different distances d were measured. The results were compared to the sound absorption predicted on the basis of Kuttruff’s and Mechel’s theoretical models. Analysis of the results indicates that the fabric has a significant influence on the system’s acoustic parameters. It is also observed, that fabric applied directly on a phase grating diffuser, produces higher absorption than when it is at some distance from it.
    Źródło:
    Archives of Acoustics; 2012, 37, 3; 317-322
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Characteristic of Sound Reflections from Curved Reflective Panels
    Autorzy:
    Szeląg, A.
    Kamisiński, T.
    Lewińska, M.
    Rubacha, J.
    Pilch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177712.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound reflection
    reflective panels
    sound scattering
    Opis:
    The paper presents the verification of a solution to the narrow sound frequency range problem of flat reflective panels. The analytical, numerical and experimental studies concerned flat panels, panels with curved edges and also semicircular elements. There were compared the characteristics of sound reflected from the studied elements in order to verify which panel will provide effective sound reflection and also scattering in the required band of higher frequencies, i.e. above the upper limit frequency. Based on the conducted analyzes, it was found that among some presented solutions to narrow sound frequency range problem, the array composed of panels with curved edges is the most preferred one. Nevertheless, its reflection characteristic does not meet all of the requirements, therefore, it is necessary to search for another solution of canopy which is effective over a wide frequency range.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 549-558
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    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
      Wyświetlanie 1-7 z 7

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