Abstract
The Seoul Norimadang, which opened in 1984, installed a dome-shaped membrane structure on the ceiling of the outdoor performance hall in 2004 to allow performances in bad weather such as rain and snow. But, the dome-shaped membrane structure collects sound energy emitted from the outside during the performance and reflects it back to the floor of the concert hall, resulting in serious acoustic defects in which the sound is mixed. Therefore, the sound performance improvement work was carried out but the sound performance was not satisfactory so far, so this study proposed to improve the sound performance by installing suspension absorbers using sound simulation. The results of study, before and after sound performance improvement sound pressure level (SPL<sub>500Hz</sub>) was 62.3 dB versus 65.2 dB, the weighted sound level (SPL<sub>dB(A)</sub>) was 67.8dB(A) versus 69.3dB(A), reverberation time (RT<sub>500Hz</sub>) was 1.66sec versus 3.02sec, early decay time (EDT<sub>500Hz</sub>) was 1.49sec versus 2.81sec, definition (D<sub>50,500Hz</sub>) was 55.8 % versus 33.5 %, clarity (C<sub>80.500Hz</sub>) was 2.8 dB versus -0.7 dB, and RASTI was 58.5 %(“Fair”) versus 43.2 %(“Poor”) was evaluated.
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