Single index to assess the airborne sound insulation DLr

Définition and scope

Determination of sound insulation performance of highway noise barriers in accordance with NF EN 1793-2.

This assessment "does not determine in situ (extrinsic performance) which also depends on factors not related to the product itself, for example, screen size, and quality of installation work or , factors related to the site as the impedance of the ground, the geometry of the site, etc.. "(Extract from DIN EN 1793-2: 1997).

Evaluation method according to DIN EN ISO 10140-1 and 2

Expression of results: Calculation of the single index for assessing the DLR airborne sound insulation according to DIN EN 1793-2: 1997

For each third octave band, weighting of the index R in accordance with normalized traffic spectrum (L) defined in standard NF EN 1793-3

The single index for assessing the DLR airborne sound insulation is classified as follows:

Catégory

DLR in dB

B0

undeterminated

B1

<15

B2

15 to 24

B3

>24

Example of Dlr test result