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The values of the normal incidence sound absorption coefficient and the normal incidence transmission loss represent key information regarding the effectiveness of materials used to improve acoustic comfort in various fields. This paper presents the measurements results of the sound absorption coefficient of polyurethane foam samples of different dimensions and geometrical shapes, with the aim of selecting calibration samples and anechoic terminations of the impedance tube with the highest possible sound absorption in frequency range of interest, as recommended by relevant standards for acoustic testing of materials using the impedance tube method. The measurement procedure was conducted in accordance with corresponding standards, following prior calibration and verification procedures of the used impedance tube configurations, the results of which are also presented in the paper. The analysis of the research results shows that the geometry of the samples significantly affects the values of the sound absorption coefficient and that wedge-shaped samples, with a wedge angle of 30°, best meet the standard requirements among all available test samples.

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Selection of Materials for Calibration Samples and Tube Terminations for Acoustic Testing in Impedance Tube

  • 会议论文

  • 发表日期：

    2025年

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  • Momir Praščević,
  • Darko Mihajlov,
  • Roumen Iankov,
  • Petar Jovanović

摘要

The values of the normal incidence sound absorption coefficient and the normal incidence transmission loss represent key information regarding the effectiveness of materials used to improve acoustic comfort in various fields. This paper presents the measurements results of the sound absorption coefficient of polyurethane foam samples of different dimensions and geometrical shapes, with the aim of selecting calibration samples and anechoic terminations of the impedance tube with the highest possible sound absorption in frequency range of interest, as recommended by relevant standards for acoustic testing of materials using the impedance tube method. The measurement procedure was conducted in accordance with corresponding standards, following prior calibration and verification procedures of the used impedance tube configurations, the results of which are also presented in the paper. The analysis of the research results shows that the geometry of the samples significantly affects the values of the sound absorption coefficient and that wedge-shaped samples, with a wedge angle of 30°, best meet the standard requirements among all available test samples.