내부마감재 변화가 공연장 음향개선에 미치는 효과

Abstract

Jinhae Community Center opened in 1993, but main hall was constructed without planing architectural acoustic characteristics. This study aimed possibility of improvement of acoustic performance in multipurpose hall and getting reasonable and scientific data for sound planing. There are measures of computer program two times, before and after, to compare improvement of acoustic performance by interior finish change. The sounds were measured at 11points in the hall using non director speaker and noise generator, and averaged the results. There were 3 measures; reverberation time, music intelligibility and speech intelligibility, to check distribution of sounds, Sound pressure level at each points and echo. Using computer simulation program, RAYNOISE, the results were analyzed on music intelligibility(, Clarity) and speech intelligibility(, Definition) as basis data. Next is the results of improvement of acoustic performance by interior fish change. 1) By the simulation, there are suitable measures in empty space and 500Hz ; reverberation time was 1.9～2.1sec, music intelligibility() was -2.0～2.0dB, speech intelligibility() was 30～35%. The music intelligibility is suitable for playing a wind instrument, a classic music, a symphony orchestra. The speech intelligibility is suitable as auditorium. 2) Before the change, in empty space and 500Hz reverberation time was 1.11sec, music intelligibility() was -1.0dB, speech intelligibility() was 15%. it is suitable for playing organ and a wind instrument in slow tempo. there is not enough speech intelligibility for play and lecture. 3) After the change, in empty space and 500Hz reverberation time was 2.2sec, music intelligibility() was 0.1dB, speech intelligibility() was 35%. The music intelligibility is suitable for playing a wind instrument, a classic music, a symphony orchestra. The speech intelligibility is suitable as auditorium. 4) These are improved acoustic performance in empty space and 500Hz. Reverberation time was 1.09sec, music intelligibility() was 1.1dB, speech intelligibility() was 20%. The improved measure is 200%. The in low frequency was improved, but dropped in the high frequency, more than 3.15kHz. There are methods for improvement of acoustic performance in high frequency. According to this study, constructed by planing architectural acoustic characteristics, interference of echo was reduced by putting sound-absorbing materials on ceiling and wall. It would be suitable place as auditorium by increasing speech intelligibility and reverberation time. This study is useful as basis data for improvement of acoustic performance in auditorium and construction of multipurpose hall. Last, before constructing and planning auditorium it need to plan suitable acoustic absorptivity and reflexibility by computer simulation to get excellent acoustic performance.