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    Wyświetlanie 1-12 z 12
    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 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
    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:
    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:
    The Application of Double-layer Curtains for Shaping Acoustics of Concert Halls
    Autorzy:
    Pilch, A.
    Karlińska, A.
    Snakowska, A.
    Kamisiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196822.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.55.-n
    43.55.Dt
    43.58.-e
    Opis:
    Requirements concerning adjustment of acoustical parameters are nowadays more and more frequently numbered among design assumptions adopted for newly constructed concert halls and other auditoriums planned to play different functions. Investors usually require that the newly designed interiors can be used for such different purposes as playing orchestral music, performing theatre spectacles, screening movies, or holding lectures. This means the necessity to undertake studies on new technologies allowing to excert effective control over acoustics of multipurpose auditoriums. This paper proposes to use acoustic curtains as an effective means of modification of acoustic absorptivity of rooms. A design solutions for such curtains is described together with basics of the theory allowing to predict their acoustic properties. Results of sound absorption coefficient calculations performed for selected systems on the grounds of airflow resistivity values assumed for the used fabrics are verified by means of results of measurements performed in the impedance tube. It is proven that double-layer curtains show more balanced sound absorption characteristics compared to single-layer curtains and therefore represent a more convenient option when used for acoustical adaptation of rooms. Based on model studies, design solutions with double-layer curtains is developed for two concert halls that allow to adjust acoustic properties of the interiors to the required functions.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-113-A-116
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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:
    Comparison of Pressure and Intensity Methods in Evaluating the Directional Diffusion Coefficient
    Autorzy:
    Pilch, A.
    Kamisiński, T.
    Zastawnik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400088.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.55.-n
    43.55.Ka
    43.55.Mc
    43.20.Ei
    Opis:
    The directional diffusion coefficient characterizes directional uniformity of acoustic energy reflected from a structure. The goal of the paper is to check whether different measurement methods of that coefficient give comparable results and can be used for different diffusing structures. ISO 17497-2:2012 recommends two basic measurement methods for this parameter, both based on sound pressure analysis. In the first method, one microphone and a measurement manipulator is used (the space method), while in the second one, 19 microphones placed on the sound-reflecting plane are required (the boundary method). In the standard it is assumed (as usually in the room acoustics), that the acoustic energy is proportional to the square of sound pressure, what is true only for the plane wave. Correctness of this assumption was checked by the modified space method where the sound intensity probe was installed instead of microphone. The test revealed that pressure methods gave comparable results for both low- and high-diffusion structures, with the boundary method giving moderately higher values for low-diffusion structures and slightly higher for high-diffusion structures. The results obtained in the intensity method were comparable with the pressure method except for the 2000 Hz frequency range.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1054-1058
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Simulation’s Verification of WFI ATHENA Filterwheel Assembly
    Autorzy:
    Pilch, A.
    Kamisiński, T.
    Rataj, M.
    Polak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/176723.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    filterwheel mechanism
    FEM
    finite element method
    FEM acoustic analysis
    ATHENA mission
    WFI
    Wide Filed Imager
    Opis:
    Ariane 5 rocket produces very high sound pressure levels during launch, what can influence structures located in the fairing. To reduce risk of damage, launch in vacuum conditions is preferred for noise sensitive instruments. In Wide Filed Imager (WFI) project, the main part of the filterwheel assembly is an extremely thin (~240 nm) filter of large area (170×170 mm), very sensitive to noise and vibrations. The aim of this study was to verify numerical calculations results in anechoic measurements. The authors also checked the influence of WFI geometry and sound absorbing material position on sound pressure level (SPL) affecting the filter mounted inside the assembly. Finite element method (FEM) simulations were conducted in order to obtain noise levels in filter position during Ariane 5 rocket launch. The results will be used in designing of WFI filterwheel assembly and endurance of the filter during launch verification.
    Źródło:
    Archives of Acoustics; 2017, 42, 3; 483-489
    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
    Tytuł:
    Informatyczna integracja rozwijającej się Grupy Kapitałowej Azoty Tarnów
    IT integration of the rapidly growing Azoty Tarnów Capital Group
    Autorzy:
    Pilch, A.
    Skolmowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218580.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    systemy informatyczne
    wspomaganie procesów biznesowych
    zarządzanie korporacyjne
    strategie IT
    IT systems
    business process support
    corporate management
    IT strategies
    Opis:
    W artykule przedstawiono sposób transformacji obszaru obsługi informatycznej Azotów Tarnów, który stał się podstawą wielopoziomowej integracji rozwijającej się Grupy Kapitałowej. Wypracowany model zarządzania obszarem, oparty na światowych wzorcach, pozwala efektywnie wspierać budowanie wartości firmy o coraz bardziej rozproszonej lokalizacji.
    The paper outlines the process of transformation of the IT services at Azoty Tarnów which has become the foundation of the multi-level integration of the growing Capital Group. The developed area management model, based on the best global practices, allows efficient support in building the value of the company with increasingly dispersed location.
    Źródło:
    Chemik; 2012, 66, 10; 1119-1124
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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