The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Acoustic design for the renovation of a cultural heritage building, SH high school auditorium

문화재로 지정된 SH고등학교 강당의 음향리노베이션설계 및 평가

  • Received : 2019.02.19
  • Accepted : 2019.04.22
  • Published : 2019.05.31
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Abstract

As can be seen in the statistics on domestic performance facilities, small or large scale of acoustic renovations seem to be unavoidable in many of those facilities due to its senility. However it is hard to find case studies which can be referred to for its acoustic renovation process. This study tried to provide a case study example of acoustic renovation for a high school auditorium which has many restrictions as a cultural heritage building. Requirements from the client and acoustic problems found through a field measurement of existing space motivated acoustic design solutions and alternatives which can improve the acoustics of the space. The whole process from the initial stage of diagnosing acoustic problems to the final stage of a post acoustic evaluation after the completion of construction was described. The result from the post acoustic evaluation suggested that reverberation characteristics of the space as well as definition and clarity have been greatly improved by applying acoustic design solutions and alternatives. However, loudness of sounds in the space didn't reach the aimed level, which is due to the limited capability of slat ceiling structure for providing strong early reflections.

국내 문화예술공간에 대한 통계조사에서 나타나듯이, 국내의 많은 공연시설들은 노후화에 따른 크고 작은 규모의 개보수가 필요한 상태이다. 그러나 이와 같은 기존공간의 음향개보수과정에서 참고가 될만한 사례연구가 많지 않은 실정이다. 본 연구는 문화재로써 많은 제약조건을 갖는 SH고등학교 강당을 대상으로 초기 음향검토에서부터 사용자의 요구조건 및 문제점들을 고려한 대안의 수립 그리고 대안들의 적용에 따른 음향성능평가과정 및 그 결과를 분석함으로써 음향리노베이션 설계의 참고자료를 제공하고자 하였다. 개선방안들의 적용결과, 실의 잔향특성이 개선되었으며 언어명료도 및 음악명료도가 개선되었음을 확인하였다. 그러나 라우드니스는 목표한 수준에 미치지 못하였으며 이는 천장에 적용된 슬랫형 구조가 강한 반사음을 제공하지 못하기 때문인 것으로 분석되었다.

Keywords

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Fig. 1. Exterior view of SH high school Egbert W. Smith auditorium.

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Fig. 2. Interior view of SH high school Egbert W. Smith auditorium before renovation (above: view from the stage, below: view from the rear seat).

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Fig. 3. Architectural drawings of SH high school Egbert W. Smith auditorium before renovation (above: main floor plan, below: cross-section).

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Fig. 4. Examples of Schroeder curves measured in SH high school Egbert W. Smith auditorium.

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Fig. 5. Optimum reverberation time at 500 Hz considering volume.

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Fig. 6. Architectural drawings of SH high school Egbert W. Smith auditorium after renovation (above: main floor plan, below: cross-section).

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Fig. 7. 3D CATT-Acoustics model for SH high school Egbert W. Smith auditorium.

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Fig. 8. Cross-sections of two different types of wall diffusers employed in SH high school Egbert W. Smith auditorium (the numbers on the top of the diffuser section indicate the height of each section in cm).

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Fig. 9. Predicted random incidence scattering coefficients for two different types of wall diffusers used in SH high school Egbert W. Smith auditorium.

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Fig. 10. Raised step floors were applied to the last two seating blocks (10 rows per each block).

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Fig. 12. Measurement positions for evaluating the acoustics of the auditorium after renovation.

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Fig. 11. Interior view of SH high school Egbert W. Smith auditorium after renovation (above: view from the stage, below: view from the rear seat).

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Fig. 13. Measured T30 and BR in SH high school Egbert W. Smith auditorium (room average ± standard deviation).

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Fig. 14. Measured D50 and C80 in SH high school Egbert W. Smith auditorium (room average ± standard deviation).

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Fig. 15. Measured LFC and G in SH high school Egbert W. Smith auditorium (room average ± standard deviation).

Table 1. Architectural dimensions of the auditorium.

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Table 2. Unoccupied room acoustic parameters measured in SH high school Egbert W. Smith auditorium before renovation.

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Table 3. Target ranges of room acoustic parameters for the renovation(mid denotes arithmetic mean of 500 Hz and 1,000 Hz values).

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Table 4. Equipment used for the measurement.

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References

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