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2013 | 123 | 6 | 1054-1058
Tytuł artykułu

Comparison of Pressure and Intensity Methods in Evaluating the Directional Diffusion Coefficient

Treść / Zawartość
Abstrakt, słowa kluczowe
Źródło
Twórcy
Bibliografia
Dodatkowe informacje
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
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.
Słowa kluczowe
Czasopismo
Acta Physica Polonica A , ISSN 0587-4246
Rocznik
Tom
123
Numer
6
Strony
1054-1058
Opis fizyczny
Daty
wydano
2013-06
Twórcy
autor
  • AGH - University of Science and Technology, Faculty of Mechanical Engineering and Robotics Department of Mechanics and Vibroacoustics, al. A. Mickiewicza 30, 30-059 Krakow, Poland
  • AGH - University of Science and Technology, Faculty of Mechanical Engineering and Robotics Department of Mechanics and Vibroacoustics, al. A. Mickiewicza 30, 30-059 Krakow, Poland
autor
  • AGH - University of Science and Technology, Faculty of Mechanical Engineering and Robotics Department of Mechanics and Vibroacoustics, al. A. Mickiewicza 30, 30-059 Krakow, Poland
Bibliografia
  • [1] L. Beranek, Music, acoustics & architecture, Willey, New York 1962
  • [2] H. Kuttruff, Acustica 35, 215 (1976)
  • [3] M. Vorländer, in: Proc. of the 15th ICA, Norway II, 689 (1995)
  • [4] M. Schroeder, J. Acoust. Soc. Amer. 57, 149 (1975)
  • [5] T.J. Cox, J. Acoust. Soc. Amer. 97, 2928 (1995)
  • [6] J. Angus, A.C. Marvin, J. Clegg, J.F. Dawson, in: Proc. 98th Convention AES, Paris 1995, Paper 3955
  • [7] T.J. Cox, in 99th Convention AES, New York 1995, Paper 4115
  • [8] T. J. Hargreaves, T. J. Cox, Y. W. Lam, P. D'Antonio, in: Proc. 16th International Congress on Acoustics and 135th Meeting Acoustical Society of America, Seattle 1998, Paper 2731
  • [9] ISO 17497-2: Acoustics - Sound scattering properties of surfaces - Part 2: Measurement of the directional diffusion coefficient in a free field
  • [10] T.J. Cox, P. D'Antonio, Acoustic absorbers and diffusers, Taylor and Francis, London 2009
  • [11] J. Felis, A. Flach, T. Kamisiński, Arch. Acoust. 37, 245 (2012)
  • [12] T.J. Cox, Ph.D. thesis, University of Salford, Manchester 1992
  • [13] P. D'Antonio, in Proc. Noise-Con 93, 259 (1993)
  • [14] M. Vorländer, E. Mommertz, Applied Acoustics 60, 187 (2000)
  • [15] ISO 17497-1: Acoustics - Sound scattering properties of surfaces - Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room
  • [16] T. Kamisiński, K. Brawata, A. Pilch, J. Rubacha, M. Zastawnik, Archives of Acoustics 37, 405 (2012)
  • [17] T. Kamisiński, K. Brawata, A. Pilch, J. Rubacha, M. Zastawnik, Archives of Acoustics 37, 317 (2012)
  • [18] W. Batko, J. Felis, A. Flach, T. Kamisiński, T. Giesko, A. Zbrowski, Arch. Acoust. 33, 201 (2008)
Kolekcja
PCP
Identyfikator YADDA
bwmeta1.element.bwnjournal-article-appv123n619kz
Identyfikatory
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