Sound propagation in long enclosures with a vertical or inclined branch

It is of interest to investigate the sound propagation in long enclosures with a vertical/inclined branch, since this may be relevant to long enclosures in practical applications, such as in high-speed railway tunnels. However, much research on sound propagation in long enclosures available is conce...

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Bibliographic Details
Published in:Applied acoustics 2006-10, Vol.67 (10), p.1022-1030
Main Author: Liu, Jacob Chia-chun
Format: Article
Language:English
Subjects:
Acoustical measurements and instrumentation
Acoustics
Applied sciences
Buildings. Public works
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Long enclosures with a vertical/inclined branch
Physics
Sound propagation
Tunnels, galleries
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Summary:It is of interest to investigate the sound propagation in long enclosures with a vertical/inclined branch, since this may be relevant to long enclosures in practical applications, such as in high-speed railway tunnels. However, much research on sound propagation in long enclosures available is concerned with straight long enclosures. In this paper, the sound pressure level (SPL) attenuation, early decay time (EDT), and reverberation time (RT30) of long enclosures with vertical/inclined branches have been studied by comparing experimental results from physical scale models, of such enclosures with those for a straight long enclosure. It has been found that, compared with the straight long enclosure, the inclined branch makes more-difference to the SPL, EDT and RT30 of the long enclosure than the vertical branch, even though both kinds of branches have the equivalent volume.
ISSN:0003-682X
1872-910X
DOI:10.1016/j.apacoust.2006.01.007