Abstract
This article explores the practical importance of the spectra used when determining dimensions of acoustical barriers and the level of uncertainty that may occur when only one kind of spectrum is considered. The authors note that acoustical barriers are widely used and the methods used to estimate the noise attenuation they produce are well understood. However, the method recommended in the European Union considers only one kind of spectrum. This has an effect on the dimensions of the barriers used for noise attenuation, generally leading to over-sizing of noise barriers, with the corresponding economical costs.
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