金属制品

qinsdau

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
vertical/inclined branch,since there may exist some branches inside the long enclosures in
practical applications,such as in high-speed railway tunnels.However,much research on
sound propagation of long enclosures available is concerning the straight long enclosures.
In this paper,the sound pressure level(SPL)attenuation,early decay time(EDT),and
reverberation time(RT30)of the long enclosures with vertical/inclined branches have
been studied by the experimental results from the constructed physical scale models,and
which also are compared with the straight long enclosure.This experimental investigation
gives interesting results on the behavior of sound propagation of the long enclosures with
vertical/inclined branches.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 though both kinds of branches have the equivalent volume.
Keywords:Sound propagation;long enclosures with a vertical/inclined branch