Comparison of Acoustic Performance Depending on the Location of Sound Absorptive and Diffuser in Small Auditoriums Using 1/10 Scale Models

Tae-hee Kim; Chan-Jae Park; Ji-hoon Park; Chan-hoon Haan

doi:10.7776/ASK.2015.34.2.146

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Comparison of Acoustic Performance Depending on the Location of Sound Absorptive and Diffuser in Small Auditoriums Using 1/10 Scale Models 1/10 축소모형을 이용한 소공연장의흡음재와 확산체의 적용위치에 따른 음향성능 비교

31 March 2015. pp. 146-156

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Abstract

This study investigated how the location of sound absorptive materials and sound diffusers affects the acoustic performance of small auditoriums. It was conducted for a standard model established with the averaged dimension of 36 auditoriums which had opened since 2000 in Daehak-ro, Seoul. In this study, the installation area of finishing materials was calculated upon a back wall which had the smallest installation effective area of finishing materials. To analyze the changes of acoustic performance according to installation location of finishing materials, experiments were carried out using the 1/10 down scale models for 8 cases which were made by classifying the installation location of ceiling and side wall into the front, middle and rear part.The used acoustic parameters were reverberation time (RT), early decay time (EDT), clarity (C80), definition (D50) and speech transmission index (STI). In result, the index related to the amount of reverberant sound (RT, EDT) showed the great changes when evaluating it through just noticeable difference (JND), but the one related to clarity (C80, D50, STI) hardly indicated the changes. In case to obtain short reverberation time, it was most effective to control reverberation time through the side walls when installing sound absorptive and diffusive materials, and side wall front was the location which could get the shortest reverberation time.

Keywords

Small auditorium

Room acoustic performance

Sound absorptive materials

Diffuser

Scale model test

본 연구는 흡음재와 확산체의 적용위치가 소공연장의 음향성능에 미치는 영향에 대하여 알아보았다. 서울의 대학로의 2000년 이후 개관한 36곳의 공연장의 평균크기로 소공연장의 표준모델을 설정하여 연구를 진행하였다. 본 연구에서는 마감재 적용유효면적이 가장 작은 뒷벽을 기준으로 마감재의 적용면적을 산출하고, 마감재의 적용위치별 음향성능 변화를 분석하기 위하여 천장, 측벽의 적용위치를 전반부, 중반부, 후반부로 구분하여 총 8가지의 경우를 만들어, 1/10 축소모형실험을 진행하였다. 사용된 음향지표는 잔향시간(Reverberation Time, RT), 초기감쇠시간(Early Decay Time, EDT), 음악명료도(Clarity, C80), 음성명료도(Definition, D50), 음성전달지수(Speech Transmission Index, STI)를 이용하였다. 실험결과 마감재의 적용위치 변화는 소리의 울림에 양과 관련된 음향인자인 잔향시간, 초기감쇠시간 은 최소 변화 감지폭에 의한 (Just Noticeable Difference, JND) 평가시 변화가 뚜렷하게 나타났고, 소리의 명료도와 관련된 인자인 음악명료도 , 음성명료도, 음성전달지수는 변화가 거의 없는 것으로 나타났다. 짧은 잔향시간을 얻고자 하는 경우 흡음재와 확산체 적용시 모두 측벽부분을 통한 잔향시간 조절이 가장 효과적이며, 측벽 전반부가 가장 짧은 잔향시간을 얻을 수 있는 위치인 것으로 나타났다.

키워드

소공연장

실내음향성능

흡음재

확산체

축소모형실험

References

1.T. H. Kim, Experimental study on the location of the sound absorptive and diffusive materials in small auditorium, (Master thesis, Chungbuk National University 2012).

2.T. H. Kim and C. H. Haan, “Analysis on the acoustic performances of small halls depending on the stage type” (in Korean), J. Acoust. Soc. Kr. Supple.1(s) 30, 294-301 (2011).

3.D. U. Jeong, J. S. Kim, Y. J . Choi, and H. J. Park, “Subjective effect of periodic diffusers installed on the sidewall in a small performance hall” (in Korean), J. Acoust. Soc. Kr. Supple.1(s) 30, 506-513 (2011).

4.T. H. Kim and C. H. Haan, “Appropriate positioning of sound diffusers and sbsorbers in small halls using scale model experiments” (in Korean), J. Acoust. Soc. Kr. Supple.1(s) 31, 101-109 (2012).

5.T. H. Kim, J. Y. Lee, C. J. Park, and C. H. Haan, “The improvement of sound clarity of small halls using sound diffusers” (in Korean), J. Acoust. Soc. Kr. Supple.2(s) 29, 330-335 (2010).

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8.J. S. Kim, A study on the effects of sidewall diffusers on the acoustics of a small performance hall, (Master thesis, Jeonbuk National University 2011).

9. ISO 3382-1:2009, Acoustics--Measurement of room acoustic parameters--part 1:performance spaces.

10.IEC 60268-16: Sound system equipment-Part 16: Objective rating of speech intelligibility by speech transmission index.

11.C. I. Jeong, “Evaluation of stage acoustics using miniature omni-directional source and HATS,” (Master thesis, Hanyang University 2009).

12.Marshall Long, Architectural Acoustics (Elsevier Academic Press, Burlington, 2006), pp. 586.

13.ISO354:2003, Acoustics-Measurement of sound absorption in a reverberation room.

Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 34
No :2
Pages :146-156
Received Date : 2014-05-28
Revised Date : 2014-11-27
Accepted Date : 2015-01-15
DOI :https://doi.org/10.7776/ASK.2015.34.2.146

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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