Propagation of train noise in housing estates
Applied Acoustics, (1997)Abstract
The study shows that the rise and decay of train noise is best modelled
by assuming the train noise to be a line source with dipole directivity.
It is consistent with previous studies on train noise propagation.
In planning new highrise buildings, the blocks are usually built
parallel to the elevated viaduct of the rapid transit system. It
is the normally held view that parallel blocks built perpendicular
to the viaduct will have adverse train noise effect. Parallel blocks
inclined to the elevated viaduct of the transit system do have the
adverse effect of multiple reflections. However, the increase due
to multiple reflections is more than offset by the shielding and
diffraction effect from the blocks on the train noise. Inclining
the parallel blocks could result in a reduction of 5 dB (A) of the
peak train noise. The study shows that inclining the blocks will
have a beneficial effect on the train noise profile.