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1:25 축소모형 홀에서 확산체의 설치부위에 따른 실내 음향지표의 변화
김용희,서춘기,이혜미,전진용,Kim, Yong-Hee,Seo, Choon-Ki,Lee, Hye-Mi,Jeon, Jin-Yong 한국음향학회 2012 韓國音響學會誌 Vol.31 No.3
본 연구는 확산체의 확산계수 측정결과를 바탕으로 확산체의 설치가 홀 내부 음장분포에 미치는 영향에 대하여 알아보았다. 오케스트라쉘이 설치된 600석 규모의 축소모형 홀을 측정대상으로 이용하였다. 잔향실법 흡음률 측정을 통해 1: 25 축소모형의 벽체와 객석부 재료 (관객 및 의자)가 선정되었고, 만석 시 잔향시간을 기준으로 컴퓨터 시뮬레이션과 대응되도록 제작하였다. 다양한 확산체 부착위치에 따른 물리적 음장의 변화를 측정하기 위해 반구 확산체를 측벽, 발코니전면, 천장 등 부위별로 7가지 조합을 만들어, 확산체 유/무에 따른 음향지표의 변화를 측정하였다. 사용된 음향지표는 잔향시간 (RT), 초기감쇠시간 (EDT), 명료도 (C80), 중심시간 (Ts), 음압레벨 (G)과 더불어 임펄스리스펀스의 자기상관함수 (ACF)로부터 도출되는 Temporal diffusion (TD)을 이용하였다. 실험결과, 확산체 설치에 따라 흠음력과 확산면적이 증가하였고, 이에 따라 평균 RT, 평균 EDT, 평균 G는 감소하는 경향을 보였다. 또한 확산체 설치로 인해 초기반사음의 방향전환이 활발하게 발생했고, 평균 TD은 측정 케이스에 따라 6.05에서 6.30의 값을 보였다. 확산체 설치에 가장 민감한 지표는 RT (R = 0.94)로 나타났고, TD와 EDT의 상관관계 (R = 0.73)가 높은 것으로 나타났다. 확산체 설치부위의 영향은 각 음향지표의 변화양상을 통해 논의되었다. This paper investigates the effects of diffuser on the acoustical parameters in music hall with consideration of the result of scattering coefficient measurement. A scale model hall of 600 seats with orchestra shell was used for experiments. The materials of 1:50 scale model was chosen through absorption coefficient measurement based on ISO 354. The model was matched to the computer simulation model in terms of reverberation time. In order to evaluate the effect of diffuser location, the measurements were accomplished with and without diffusers according to 7 configurations by diffuser-installed region; sidewall, balcony front, ceiling and so on. The following acoustical parameters were extracted from each measurement case; Reverberation time (RT), Early decay time (EDT), Clarity (C80), Center time (Ts), Sound strength (G) and Temporal diffusion (TD) from the auto-correlation function (ACF) of impulse responses. As a result, the absorption power and diffusion power were increased with number of diffusers. Accordingly RT, EDT and G were decreased by diffuser and the redirection of reflections was occurred briskly. Averaged TD was 6.05 to 6.30 by measurement cases. RT was found to be the most related factor to diffusion power (R = 0.94). The correlation between TD and EDT was high (R = 0.73). In addition, the effects of diffuser-installed location were discussed in terms of acoustical parameter variation.
전진용(Jeon Jin-Yong),서춘기(Seo Choon-Ki),이평직(Lee Pyoung-Jik) 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8
The Little theater in Sejong Performing Arts Center is a proscenium theater with 447 seats, which was built in 1978. Acoustical remodeling design of the theater was carried out to improve the acoustic quality in audience area and to meet functional requirements of the theater. Design strategies included use of more reflective surfaces, installation of diffusers on sidewalls and orchestra pit, and side balconies. In particular, sidewall diffusers were designed through measurements of scattering coefficients according to ISO standardAfter remodeling, field measurements were performed to validate the acoustical design. The results was shown that unoccupied reverberation time varied from 0.93 to 1.06 s, and 1-IACC (Interaural Cross-correlation Coefficient) was more than 0.60. It was also found that sidewall diffusers resulted in decreases of COV (coefficient of variation) of early decay time and 1-IACC and increases of and Np (number of peak). Furthermore, the balance, refers to the sound power ratio of the stage and the pit sources, was -0.2 ㏈.
공간감 향상을 위한 세종 체임버홀 리노베이션 설계의 음향성능 평가
전진용(Jin Yong Jeon),서춘기(Choon Ki Seo),김용희(Yong Hee Kim) 한국생활환경학회 2012 한국생활환경학회지 Vol.19 No.1
In this paper, acoustical renovation design process of the Convention Center in Sejong Performing Arts Center for multi-purpose uses from conference to recital was investigated. The area of the convention space was about 612 m2 and it has been used mainly for meeting, symposium and other functional events. After renovation, the Sejong Chamber Hall has 456-seats with a volume of 3,212 m3. Its unoccupied RT was 1.29 s and the average of 1-IACC (Interaural Cross-correlation Coefficient) was 0.71. The leaf-shaped floor plan and tilted side balconies (a slope of 1:10) within 16 m width between side walls were designed to increase lateral reflection. To provide maximized intimacy, the continental style and every-other-row seating arrangement without center isle was planned. The saw-tooth shaped GFRC (Glass Fiber Reinforced Concrete) wall reflectors and the protruded rear wall of the stage were designed for spatial responsiveness of the hall.