Acoustic Effect of Drainage Gaps in Noise Barriers
Regular paper
M+P consulting engineers
Monday 1 june, 2015, 15:20 - 15:40
0.2 Berlin (90)
Abstract:
The design and construction of noise barriers have to meet acoustical
requirements. However, with respect to structural requirements, it is
sometimes necessary to leave gaps in the structure. Especially drainage gaps
at the bottom of noise barriers are frequently applied. These gaps will
influence the acoustic performance of the barrier.
Research on the acoustic effect of these drainage gaps has been done, but
mostly by modelling and calculating techniques. In this research measurements
have been performed on a series of noise barriers with drainage gaps. The
acoustic insulation and insertion loss of these barriers (before and after
closing the drainage gaps) are measured. The results of the measurements are
compaired to calculated values of the insertion loss.
The results of the measurements and calculations are used to validate the
requirements prescribed on drainage gaps. Recommendations on the use of
drainage gaps to prevent deteriation of the acoustic quality of noise barriers
are given.