Abstract:

The newly-built elevated stations of high-speed railway in China have oversize waiting halls, and intensive researches on the architectural acoustics of such oversize volume room are insufficient. In this paper, by taking a waiting hall as an example, room acoustic parameters are analyzed by means of in-situ measurement and computer simulation techniques. The results show that (1) the reverberation time (RT) of the waiting hall are rather long, and the average reverberation time in medium frequency is 9.21s, which is longer than those in low and high frequencies; (2) in the waiting hall within 500~1kHz, the speech transmission index (STI) is highly relevant to the early decay time (EDT) but is lowly relevant to the RT; (3) enlarging the sound absorption area of surfaces can significantly improve the room acoustic parameters; (4) A weighted sound pressure level is highly relevant to the logarithm value of the source-receiver distance while the RT within 500~1kHz is irrelevant to the source-receiver distance; and (5) within a certain source-receiver distance, the EDT within 500~1kHz, the speech articulation within 500~1kHz and the STI are highly relevant to the distance. Besides, the distances between the distributed loudspeaker system in the waiting hall and the passengers should be carefully designed so as to meet the requirement of speech articulation.

Key words: oversize volume room, waiting halls, architectural acoustics, computer simulation