Abstract

This document describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of road traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a road traffic noise reducing device with and without the added device installed on its top. The effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height (the method described gives the acoustic benefit over a simple barrier of the same height; however, in practice the added device can raise the height and this could provide additional screening depending on the source and receiver positions). The test method is intended for the following applications: • preliminary qualification, outdoors or indoors, of added devices to be installed on road traffic noise reducing devices; • determination of sound diffraction index difference of added devices in actual use; • comparison of design specifications with actual performance data after the completion of the construction work; • verification of the long-term performance of added devices (with a repeated application of the method); • interactive design process of new products, including the formulation of installation manuals. The test method can be applied both in situ and on samples purposely built to be tested using the method described here. Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in the restricted frequency range and the reasons of the restriction(s) shall be clearly reported. A single-number rating is calculated from frequency data. For indoors measurements see Annex A.

Begin

2020-11-06

WI

00226266

Planned document number

DIN EN 1793-4

Project number

00519032

Responsible national committee

NA 005-10-26 AA - Noise reducing devices (national mirror committee for CEN/TC 226/WG 6)  

Responsible european committee

CEN/TC 226/WG 6 - Noise reducing devices  

draft standard

Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction; German and English version prEN 1793-4:2023
2023-08
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previous edition(s)

Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction; German version EN 1793-4:2015
2015-05

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