In situ methods for the characterisation of road noise barriers efficiency

摘要

Different acoustic properties of road noise barriers can be measured on site: global characteristics of insertion loss, or intrinsic characteristics of sound abosorption and sound transmission. For insertion loss measurement, the standardised method ISO 10847 was tested on a basic case of an existing road barrier. An experimentation implying three independent laboratories showed relatively poor reliability and a lack of operational applicability on real site. For intrinsic characteristics of sound absorption and transmission, an experimental comparison was made between two impulse method: the French standardised method AFNOR 31089 using a gun shot, and "Adrienne" method developed by a European research group and suggested as a future European Standard. A rather good agreement was found between both methods and differences are discussed.