The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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A preliminary study on the measurement method for determining the absorption coefficient of sound barrier panels

방음판의 흡음률 측정방법 제안을 위한 기초 연구

  • Received : 2023.01.06
  • Accepted : 2023.02.27
  • Published : 2023.03.31
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Abstract

Sound barrier walls are the most basic way to cope with noise problems in urban residential environments. The most important acoustic function of sound insulation board is represented by sound transmission loss and sound absorption coefficient. However, Korea has not yet established a standard for measuring the sound absorption rate of sound insulation boards. In addition, even in the European standard, where the overall acoustic standard of soundproofing boards has already been established, the sound absorption rate is applied only to the standard for measuring the sound absorption rate of general building finishing materials, and a separate measurement method considering the characteristics of soundproof walls and soundproofing boards is not presented. The sound absorption coefficient should be evaluated by summing up the energy absorbed into the material as well as the energy transmitted through the material, but the current European standard has a problem in that the transmitted sound energy is not taken into account. In this paper, we reviewed the sound absorption coefficient measurement standards of sound insulation boards currently being presented, and verified the difference between the results and the new measurement method considering transmission sound for sound insulation boards actually used in Korea.

방음벽은 도시 주거환경의 소음문제에 대응하기 위한 가장 기본적인 방법이다. 방음판의 가장 중요한 음향적 기능은 음향투과손실과 흡음률로 표시된다. 특히 주거시설이 밀집되어있는 도심구간의 철도나 간선도로에서 원하지 않는 반사음에 의한 2차 소음 문제를 최소화하기 위하여는 방음판의 흡음성능이 중요하다. 그러나 아직까지 우리나라는 방음판의 흡음률 측정방법에 관한 규격이 마련되어있지 않다. 또한 방음판의 전반적인 음향규격이 이미 만들어져 있는 유럽규격에서조차 흡음률에 관해서는 일반적인 건축마감재료의 흡음률 측정기준을 준용하고 있을 뿐, 방음벽과 방음판의 특성을 감안한 별도의 측정방법을 제시하지 못하고 있다. 흡음률은 재료의 내부로 흡수된 에너지 뿐 아니라 재료를 투과한 에너지까지 합산하여 평가되어야 하는데 현재의 유럽규격은 투과음 에너지를 감안하지 못하고 있는 문제를 안고 있다. 이 논문에서는 현재 제시되고 있는 방음판의 흡음률 측정 규격에 대해 고찰하고, 우리나라에서 실제 사용되고 있는 방음판을 대상으로 투과음을 감안한 새로운 측정방법과의 결과 차이를 검증하였다. 아울러 새로운 방음판 흡음률 측정규격의 마련을 위한 기초적 아이디어를 제시하였다.

Keywords

Acknowledgement

본 논문은 2022학년도 목포대학교 교내연구비 지원에 의하여 연구되었음

References

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