Influence of wall absorption on low-frequency dependence of reverberation time in room of irregular shape
- 作者：Mirosł ; aw Meissner
- 关键词：Coupled enclosures ; Modal analysis ; Reverberation time
- 刊名：Applied Acoustics
- 出版年：2008
- 期刊代码：12_0003682x
- 类别：et
- 出版时间：July 2008
- 卷：69
- 期：7
- 页码：583-590
- 文件大小：662 K
摘要
In this paper, a modal analysis was used to describe a reverberation phenomenon in a room of complex shape. A theoretical model was limited to low sound frequencies, when eigenmodes are lightly damped, thus they may be approximated by uncoupled normal acoustic modes of a hard-walled room. A utility of this method was demonstrated in a numerical example where the enclosure in a form of two coupled rooms was considered. A reverberation time was evaluated from a time decay of spatial root mean square pressure, the overall measure of room pressure. The results of calculations, performed for three different distributions of absorbing materials on room walls, showed how various location of the material can effect a dependence of the reverberation time on a frequency of sound source.