• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.201-204
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• 2007

다양한 공연장 및 대공간에서의 실내음향 제어를 위해서는 실내마감재료의 흡음 및 확산성능을 제어할 수 있는 재료가 필요하다. 본 연구에서는 이를 위해 알루미늄 새시를 이용한 흡음구조를 개발하였으며, 흡음특성을 조사하기 위하여 수직입사 흡음계수와 잔향실법 흡음계수를 측정하였다. 수직입사 흡음계수 측정결과 알루미늄 다목적 흡음재의 타공구조와 인서트에 의해 형성되는 공간이 공명형 흡음기의 역할을 하여 중.저주파수 대역의 흡음계수가 증가되는 것으로 나타났다. 잔향실법 흡음계수 측정결과 알루미늄 새시를 이용한 흡음구조의 형성에 따라 공명주파수 대역보다 낮은 중저주파수 대역의 흡음계수가 증가되는 것으로 나타났다. 공기층 증가에 따라 공명주파수 이상 대역에서의 흡음률은 증가되고 주파수 대역별 흡음계수 편차도 감소되는 것으로 나타났으며, 고주파수 대역의 흡음률 향상을 위한 방안이 필요한 것으로 나타났다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.857-860
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• 2003

We introduced the basic direction of revision for KS F 2805 (method for measurement of sound absorption coefficient in a reverberation room). It is fundamentally equal to ISO 354 (measurement of sound absorption in a reverberation room) which was state of ISO/FDIS 354. Two main points were strongly reviewed. First, the sound absorption coefficient values for Type J test specimen mounting was investigated. Next, the reverberation time difference between the conventional method and new additional one, impulse response method were compared.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2010년도 추계학술대회 논문집
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• pp.289-290
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• 2010

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 춘계학술대회 논문집
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• pp.141-142
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• 2009

• 한국소음진동공학회논문집
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• 제11권5호
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• pp.83-88
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• 2001

The sound absorption coefficient of glass wool (bulk density of 48 kg/m:1 and 32 kg/m7) was measured by reverberation room method as varying their cross-sectional area. The results show that the absorption is larger for smaller samples because of edge effect. The absorption coefficient with two different kinds of sources. 1/.7-octave band and while noise, gives similar values.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.1194-1197
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• 2006

Recently, international standard for measurement of sound absorption in a reverberation room has been amended. In the revised version, temperature, humidity and air pressure conditions are strictly restricted and also the concrete procedures are presented to reduce the differences in test results by adding inspection of diffusion, measurement uncertainty etc. In this paper, the systematic tests are conducted based on the inspection guide of diffusion defined by ISO 354 and the effects of diffusers on the measurement of sound absorption ratio are considered. As a result, we perceived that the averaged sound absorption ratio in mid and high frequency range is expected to measure around $0.05{\sim}0.1$ higher in high sound absorption material. Therefore, as for the reverberation room for measurement of sound absorption, we need to take into consideration not only the spatial standard deviation of sound pressure mandated by ISO 3741, but also, inspection regulation of diffusion showed by ISO 354.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.762-765
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• 2005

The absorption materials have been used to enhance the performance of a noise barrier and improve the room acoustics. In this study, 6 products of absorptive materials generally used in Korea were chosen, and their absorption performance were tested in various conditions, that is, it was measured while changing thickness, density and air gap in their back, and measured with or without facing on their face. Finally, the absorption coefficients were compared by reverberation and impedance tube method.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1991년도 춘계학술대회논문집; 한국해사기술연구소, 대전; 1 Jun. 1991
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• pp.65-69
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• 1991

소음제어대책 수립시, 흡음구조는 공조용소음기, 공업용소음기, Enclosure, 실 내 흡음판등에 폭넓게 이용되고 있다. 흡음구조의 재료중 글라스울은 뛰어난 흡음성능과 고온에서의 내구성 및 난연성등으로 인하여 여러 흡음재료중에 서 가장 많이 이용되고 있으나 글라스율 미립자의 비산 및 강도문제로 글라 스율에 글라스 클로스(Glass Cloth), P.E.Film등과 같은 글라스울 비산방지막 과 유공함석판을 붙인 흡음구조체로 제작하여 이용하는 것이 일반적이다. 국 내외적으로 글라스울만의 흡음율 데이타는 각종 문헌등에 많이 발표되어 있 으나 글라스울에 글라스울 비산방지막과 유공함석판을 붙인 흡음구조체의 흡음율데이타는 거의 없는 실정이다. 본 연구에서는 이러한 글라스울 흡음구 조체의 글라스울의 밀도, 글라스울 비산방지막의 종류, 유공함석판의 유공치 수 등에 따른 흡음특성을 잔향실법 흡음율측정방법에 의해 측정 평가하고 이들을 상호 비교검토하여 각종 소음 제어대책의 기초 설계자료로 제시하고 자 한다.

• 한국소음진동공학회논문집
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• 제16권7호
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• pp.683-689
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• 2006

The sound absorption materials have been used to enhance the performance of a noise barrier and improve the room acoustics. In this study, 6 products of sound absorption materials generally used in Korea were chosen, and their absorption performance was tested in various conditions, that is, it was measured while changing thickness, density and air-gap in their back, and measured with or without facing on their face.

• 한국소음진동공학회논문집
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• 제17권5호
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• pp.373-378
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• 2007

Today, the use of the sound absorptive material is increasing to improve the room acoustics in the auditorium and music hall, etc. Usually, the sound absorption materials have been used to enhance the performance of a noise barrier and improve the room acoustics in construction site. Generally, the sound absorbtion coefficients are the most important factor reflecting the sound absorbtion performance. There are two methods to measure the sound absorption coefficient. The first one is the reverberation room method, and the second is the impedance tube method. In this study, we measure the sound absorbtion coefficients using these two methods, and then we compared the results of the sound absorbtion coefficients to look into the difference of results between reverberation room method and impedance tube method. Also we compared the results of the sound absorbtion coefficients with respect to the size of sample and the volume of reverberation room. From the experiment, we could see that the sound absorbtion coefficients are measured equally for different sample size. But the sound absorbtion coefficients are measured differently according to test methods and test conditions.