Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Comparison of Sound Absorption Performance between Fresh and Air-dried Leaves by Leaf Composition in Quercus glauca

  • Su Young Jung (Warm-Temperate and Subtropical Forest Research Center, National Institute of Forest Science) ;
  • Hee-Seop Byeon (College of Agriculture & Life Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Kwang-Soo Lee (Warm-Temperate and Subtropical Forest Research Center, National Institute of Forest Science) ;
  • Hyun-Soo Kim (Warm-Temperate and Subtropical Forest Research Center, National Institute of Forest Science)
  • Received : 2022.10.29
  • Accepted : 2022.12.29
  • Published : 2023.01.31
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Abstract

The purpose of this study was to determine the optimal sound absorption conditions by comparing the sound absorption characteristics of fresh and air-dried leaves of Quercus glauca, the main species of evergreen broadleaf trees (EBLT) in southern Korea. The sound absorption coefficients (SACs) obtained under 18 conditions were comparatively analyzed. The SAC of air-dried leaves improved significantly with increasing leaf layer thickness. The highest average SAC in the fresh leaf group was 0.617, which was observed under the condition of a leaf specimen size of 0.5 × 0.5 cm2 and a leaf layer thickness of 1.75 cm. In a group of air-dried leaves, this was 0.615 under the condition of a leaf specimen size of 0.5 × 0.5 cm2 and a leaf layer thickness of 2.50 cm. The maximum value of SAC for each wavelength was observed under the condition of a leaf layer thickness of 2.50 cm consisting of 0.5 × 0.5 cm2 leaf specimens, ranging from 1,400 Hz to 1,500 Hz.

Keywords

Acknowledgement

This research was supported by a grant the Research and Development Support Project SC0600-2021-01 of the National Institute of Forest Sciences, Korea Forest Service.

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