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실측 및 컴퓨터 시뮬레이션에 의한 다목적 오디토리움의 실내음향 특성 분석
이원열(Won-Yeul Lee),조창근(Chang-Geun Cho),손장열(Jang-Yeul Sohn) 한국생활환경학회 2001 한국생활환경학회지 Vol.8 No.1
The aim of this study was to improve the acoustical design of a multipurpose auditorium. In the process of the study, the acoustical design plan was established before constructing a multipurpose hall and the acoustical performance was estimated after constructing a multipurpose auditorium. Moreover, RT??, SPL of distribution, EDT (Early Delay Time), C80 (Clarity), D50 (Definition), STI (Sound Transmission Index) and IACC (Interaural Crosscor-relation) were measured. Room acoustical parameters such as EDT, C80, D50, SIT, IACC were analysed. Room acoustical characteristics were estimated through comparing the measured indoor acoustical indices with some acoustical standards of multipurpose auditorium. We intend to seek for the optimum acoustic design conditions by performing Computer Simulation according to the shape of a room.
방음터널 단면형상에 따른 소음저감 특성 평가 : 터널 내부소음을 중심으로
이원열,김하근,오양기,주문기 대한건축학회 2004 대한건축학회논문집 Vol.20 No.2
It seems inevitable for residential buildings to be high-rise and allocated near traffic roads due to the crowdedness in urban areas. Acoustic environments in those areas have been seriously deteriorated by the increase of traffic vehicles. But sound barriers have a limitation in controlling noise due to diffraction noise from sound barriers. Hence sound barrier is not effective to protect the high-rise apartment from traffic noise. This work aims at evaluating characteristics of noise reduction according to the tunnel section shapes by using 1/5 scale model. We carried out a number of field measurements for 1/5 scale model of noise barrier tunnels with various sectional shapes. The results were as follows 1) The level difference was ranged from 0㏈ to 1.2㏈ according to the opening in the ceiling 2) The level difference was ranged from 0.4㏈ to 2.3㏈ when sound-absorbing materials were increased up to 45% of all surface areas. 3) There was generally good agreement between prediction results and the measurement results.
방음터널 단면형상에 따른 소음저감 예측 및 특성 평가 : 터널 외부소음을 중심으로
오양기,김하근,이원열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.8
Noise emitted from urban arterial roads is getting more serious problem in the environmental quality of living. Though noise barrier is one of measures to mitigate noise levels at housing area, it has a limited effect especially on apartment units high around the roads. Noise barrier tunnel may be another effective device for noise reduction even to high rise apartments. On these basis, this study aims at providing a number of possible sectional shapes of noise barrier tunnels, measuring their effects on noise reduction with 1 to 5 scale model measurements, and proposing/validating a prediction technique of their effects. According to a number of measurements with various sectional shapes or the scaled model, 1)the proposed sectional shapes have affirmative effects on noise reduction, 2)the difference in noise levels between in and out of tunnel are about 10dB whether there is opening in the ceiling or not. 3)results from predictions and the measurements show generally good agreements within 0.3∼3.6 dB(A).