| Keywords |
Auditorium ; Acoustic performance ; Moving-wall system ; Interior noise ; Acoustic simulation |
| Abstract |
This study is aimed to evaluate the acoustic performances of small auditorium and to suggest improvement plans. The auditorium has moving-wall system between assembly hall and lobby which can be extended a seating capacity if necessary. The measurement results of existing auditorium showed that the reverberation time at 500 Hz octave band frequency were 1.66 sec in case of using assembly hall only and 1.98 sec in case of using assembly hall and lobby. The D50 parameter showed respectively 36% and 28%, while the RASTI parameter showed equally 0.54. The NC (noise criterion) rating in assembly hall was estimated to NC-50 when the air conditioner was operated. To improve the acoustic performance for speech and lecture, several redesigns such as reduction of room volume, partial replacement of finishing materials, and reconstruction of air conditioner anteroom partitions were investigated by using acoustic simulation. The simulation results showed that the acoustic parameters were highly improved. The reverberation time at 500Hz changed to 0.65 sec and 0.84 sec by improvement redesigns. The D50 changed to 69% and 28%. Also, the RASTI changed to 0.69 and 0.65. And the NC rating in assembly hall was predicted to NC-35. |