Descrição

Acoustical barriers are wide implemented and the way to estimate its
attenuation is well known. However, the spectral emission of sources such as road traffic
is not well established. So, the intent of this communication is to define the influence of
spectral emission on the dimensions of acoustical barriers and the level of uncertainty
occurring when we do not know the characteristics of the spectrum. We have calculated
the difference between the dimensions of barriers to give the same attenuation, for three
types of spectral emission with the same overall level: low frequency, median frequency
and high frequency. We will define the relations of these spectra with real characteristics
of traffic.