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Predicted Absorption Performance of Cylindrical and Rectangular Permeable Membrane Space Sound Absorbers Using the Three-Dimensional Boundary Element Method

Author

Listed:
  • Masahiro Toyoda

    (Department of Architecture, Faculty of Environmental and Urban Engineering, Kansai University, Yamate-cho, Suita, Osaka 564-8680, Japan)

  • Kota Funahashi

    (Environmental Acoustics Lab., Department of Architecture, Grad. Sch. of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan)

  • Takeshi Okuzono

    (Environmental Acoustics Lab., Department of Architecture, Grad. Sch. of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan)

  • Kimihiro Sakagami

    (Environmental Acoustics Lab., Department of Architecture, Grad. Sch. of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan)

Abstract

Three-dimensional, permeable membrane space sound absorbers have been proposed as practical and economical alternatives to three-dimensional, microperforated panel space sound absorbers. Previously, the sound absorption characteristics of a three-dimensional, permeable membrane space sound absorber were predicted using the two-dimensional boundary element method, but the prediction accuracy was impractical. Herein, a more accurate prediction method is proposed using the three-dimensional boundary element method. In the three-dimensional analysis, incident waves from the elevation angle direction and reflected waves from the floor are considered, using the mirror image. In addition, the dissipated energy ratio is calculated based on the sound absorption of a surface with a unit sound absorption power. To validate the three-dimensional numerical method, and to estimate the improvement in prediction accuracy, the results are compared with those of the measurements and two-dimensional analysis. For cylindrical and rectangular space sound absorbers, three-dimensional analysis provides a significantly improved prediction accuracy for any shape and membrane sample that is suitable for practical use.

Suggested Citation

  • Masahiro Toyoda & Kota Funahashi & Takeshi Okuzono & Kimihiro Sakagami, 2019. "Predicted Absorption Performance of Cylindrical and Rectangular Permeable Membrane Space Sound Absorbers Using the Three-Dimensional Boundary Element Method," Sustainability, MDPI, vol. 11(9), pages 1-15, May.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:9:p:2714-:d:230755
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    References listed on IDEAS

    as
    1. Asniawaty Kusno & Kimihiro Sakagami & Takeshi Okuzono & Masahiro Toyoda & Toru Otsuru & Rosady Mulyadi & Kusno Kamil, 2019. "A Pilot Study on the Sound Absorption Characteristics of Chicken Feathers as an Alternative Sustainable Acoustical Material," Sustainability, MDPI, vol. 11(5), pages 1-11, March.
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    Cited by:

    1. Tomáš Ulrich & Jorge P. Arenas, 2020. "Sound Absorption of Sustainable Polymer Nanofibrous Thin Membranes Bonded to a Bulk Porous Material," Sustainability, MDPI, vol. 12(6), pages 1-15, March.

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