A Study on the Measurement and Evaluation Methods of Sound Absorption Performance of Absorbing Materials Used in Noise Barriers

Soon-Seong Moon; Jun-Oh Yeon; Hee-Mo Goo; Wan-Ki Moon

doi:10.21086/ksles.2026.4.33.3.269

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2026 Vol.33, Issue 3 Next Page

Research Article

A Study on the Measurement and Evaluation Methods of Sound Absorption Performance of Absorbing Materials Used in Noise Barriers 방음판에 활용되는 흡음소재의 흡음계수 측정 및 평가 방법에 대한 실험적 고찰

30 June 2026. pp. 269-279

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Abstract

In this study, the applicability of normal-incidence sound absorption coefficients measured using the impedance tube method for predicting random-incidence absorption characteristics in a reverberation room was investigated through room acoustic simulation. Four types of porous sound-absorbing materials were tested, and their absorption coefficients were measured using both the impedance tube method and the reverberation room method in accordance with relevant standards. A numerical model of the reverberation room was developed using the ODEON software, and the model was calibrated by matching the simulated reverberation time with the measured reverberation time of the empty room. The calibrated model was then used to simulate the reverberation room conditions with test specimens installed. The normal-incidence absorption coefficients obtained from the impedance tube measurements were converted to octave bands and applied as input parameters for the simulation. The predicted reverberation time and corresponding absorption coefficients were compared with the measured results from the reverberation room. The results showed that discrepancies between measured and simulated reverberation time were observed, particularly in the low-frequency range. However, after calibration of boundary conditions, the simulated results showed good agreement with the measured reverberation room data across most frequency bands. In contrast, the use of averaged absorption properties resulted in increased deviations, especially at higher frequencies. These findings indicate that while direct application of impedance tube data has limitations due to differences in incidence conditions, calibrated room acoustic simulation can effectively improve the prediction accuracy. The study demonstrates the potential applicability of impedance tube measurements for predicting reverberation room absorption performance when appropriate model calibration is applied.

키워드

Sound absorption coefficient

Impedance tube method

Reverberation room method

Noise barrier

Acoustic performance prediction

References

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Information

Publisher :The Korean Society of Living Environmental System
Publisher(Ko) :한국생활환경학회
Journal Title :Journal of The Korean Society of Living Environmental System
Journal Title(Ko) :한국생활환경학회
Volume : 33
No :3
Pages :269-279
Received Date : 2026-04-03
Revised Date : 2026-04-24
Accepted Date : 2026-04-24
DOI :https://doi.org/10.21086/ksles.2026.4.33.3.269

Journal of The Korean Society of Living Environmental System ISSN:1226-1289(Print) 한국생활환경학회

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