FprEN 1793-4
(Main)Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - Intrinsic sound diffraction
Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - Intrinsic sound diffraction
This European Standard describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a 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 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.
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 4: Produktspezifische Merkmale - Intrinsische Schallbeugung
Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination de la performance acoustique - Partie 4 : caractéristiques intrinsèques - Diffraction sonore intrinsèque
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih lastnosti - 4. del: Bistvene lastnosti - Terenske vrednosti difrakcije zvoka
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2023
Nadomešča:
SIST EN 1793-4:2015
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih
lastnosti - 4. del: Bistvene lastnosti - Terenske vrednosti difrakcije zvoka
Road traffic noise reducing devices - Test method for determining the acoustic
performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen
Eigenschaften - Teil 4: Produktspezifische Merkmale - In-situ-Werte der Schallbeugung
Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination
de la performance acoustique - Partie 4 : caractéristiques intrinsèques - Valeurs in-situ
de la diffraction acoustique
Ta slovenski standard je istoveten z: prEN 1793-4
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
93.080.30 Cestna oprema in pomožne Road equipment and
naprave installations
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
prEN 1793-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2023
ICS 17.140.30; 93.080.30 Will supersede EN 1793-4:2015
English Version
Road traffic noise reducing devices - Test method for
determining the acoustic performance - Part 4: Intrinsic
characteristics - In situ values of sound diffraction
Dispositifs de réduction du bruit du trafic routier - Lärmschutzvorrichtungen an Straßen - Prüfverfahren
Méthode d'essai pour la détermination de la zur Bestimmung der akustischen Eigenschaften - Teil
performance acoustique - Partie 4 : caractéristiques 4: Produktspezifische Merkmale - In-situ-Werte der
intrinsèques - Valeurs in-situ de la diffraction Schallbeugung
acoustique
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 226.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1793-4:2023 E
worldwide for CEN national Members.
prEN 1793-4:2023 (E)
Contents Page
European foreword .4
Introduction.5
1 Scope .6
2 Normative references .6
3 Terms and definitions.7
4 Symbols and abbreviations .9
5 Sound diffraction index difference measurements .11
5.1 General principle .11
5.2 Dimensions and specifications .11
5.2.1 Added devices .11
5.2.2 Reference walls.12
5.2.3 In-situ tests.12
5.3 Positions of the sound source.12
5.4 Position of the microphone(s) .13
5.5 Free-field measurements.14
5.6 Measured quantity .19
5.7 Measuring equipment .19
5.7.1 Components of the measuring system .19
5.7.2 Sound source .20
5.7.3 Test signal .21
5.8 Data processing .21
5.8.1 Calibration .21
5.8.2 Sample rate .21
5.8.3 Background noise.22
5.8.4 Measurement points .22
5.8.5 Adrienne temporal window .22
5.8.6 Placement of the Adrienne temporal window.24
5.8.7 Low frequency limit and sample size.25
5.9 Positioning of the measuring equipment .26
5.9.1 Selection of the measurement positions.26
5.9.2 Reflecting objects.27
5.9.3 Safety considerations .27
5.10 Sample surface and meteorological conditions.27
5.10.1 Condition of the sample surface.27
5.10.2 Wind .27
5.10.3 Air temperature.27
5.11 Sound diffraction index difference.27
5.12 Single-number rating of sound diffraction index difference .28
6 Measurement uncertainty .29
7 Measuring procedure .29
7.1 Test report .30
Annex A (informative) Low-frequency limit and window width.31
A.1 General.31
prEN 1793-4:2023 (E)
Annex B (informative) Measurement uncertainty.35
B.1 General.35
B.2 Expression for the calculation of sound diffraction index .35
B.3 Contributions to measurement uncertainty.36
B.4 Expanded uncertainty of measurement.37
B.5 Measurement uncertainty based upon reproducibility data .37
Annex C (normative) Template of test report on sound diffraction index difference of
added devices .38
C.1 General.38
Annex D (informative) Indoor measurements for product qualification .41
D.1 Parasitic reflections .41
D.2 Reverberation time of the room .41
Bibliography .42
prEN 1793-4:2023 (E)
European foreword
This document (prEN 1793-4:2023) has been prepared by Technical Committee CEN/TC 226 “Road
equipment”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1793-4:2015.
With respect to the superseded document, the following changes have been made:
— The title has been improved.
— The ‘References’ clause has been updated.
— The ‘Terms, definitions and symbols and abbreviations’ clause has been updated.
— The single-number rating DL is now reported with one decimal digit.
∆DI
— Annex A “Low-frequency limit and window width” has been added.
— Annex C with a template of the test report has been added.
— Previous Annex A has been shifted to Annex D.
— The ‘Bibliography’ clause has been updated.
EN 1793-4 is part of a series and should be read in conjunction with the other parts. All parts are listed
in the following:
— EN 1793-1:2023, Road traffic noise reducing devices - Test method for determining the acoustic
performance – Part 1: Intrinsic characteristics – Sound absorption under diffuse sound field conditions;
— EN 1793-2:2023, Road traffic noise reducing devices - Test method for determining the acoustic
performance – Part 2: Intrinsic characteristics – Airborne sound insulation under diffuse sound field
conditions;
— EN 1793-3:2023, Road traff
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