ESDU 79011:2011

A method is provided for the prediction of the total attenuation
of sound due to a sharp-edged barrier positioned between the source
and the observer. The major attenuation is that due to diffraction
at the barrier edges. Additional components of sound attenuation,
which are accounted for, are those due to the increased propagation
path length between source and observer, and to source directivity.
Guidance is also given on possible sound reduction resulting from
atmospheric attenuation. The theoretical basis of the prediction
procedure is also described. Its application to the estimation of
sound attenuation by a finite barrier by considering the
diffraction at each edge is explained. Guidance is given on the
maximum of noise shielding by a barrier.

The prediction procedure is provided in both graphical form and
as a computer program known as ESDUpac A7911.

An additional program B7911, which can be used to create
required input files, is also provided.

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