斜角支道长形封闭空间之声波传播研究

qinsdau

à論500 and 1000 HzH?\/á?8—–Dd?
J*?g?ú?
Study on sound propagation of long enclosures with
a vertical/inclined branch at 500 and 1000 Hz 1/3 octave bands
1.Jacob Chia-chun Liu
2.Po-Chien Lu
3.Luke Chen
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g?~è‰?j 105(北路298g?樓
ej 02-27423222
E-mailj jacob.epa@msa.hinet.net
Department of Water Resources and Environmental Engineering,
Tamkang University,Taiwan
Abstract
It is of interest to investigate the sound propagation of long enclosures with a
rtical/inclined branch,since there may exist some branches inside the long enclosures in
actical applications,such as in high-speed railway tunnels.However,much research on
und propagation of long enclosures available is concerning the straight long enclosures.
this paper,the sound pressure level(SPL)attenuation,early decay time(EDT),and
verberation time(RT30)of the long enclosures with vertical/inclined branches have
en studied by the experimental results from the constructed physical scale models,and
hich also are compared with the straight long enclosure.This experimental investigation
ves interesting results on the behavior of sound propagation of the long enclosures with
rtical/inclined branches.Compared with the straight long enclosure,the inclined
anch makes more difference to the SPL,EDT and RT30 of the long enclosure than the
rtical branch though both kinds of branches have the equivalent volume.
ywords:Sound propagation;long enclosures with a vertical/inclined branch