prEN 1793-1

SLOVENSKI STANDARD
01-november-2023
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih
lastnosti - 1. del: Karakteristike, značilne za absorpcijo zvoka pri razpršenem
zvočnem polju
Road traffic noise reducing devices - Test method for determining the acoustic
performance - Part 1: Intrinsic characteristics of sound absorption under diffuse sound
field conditions
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen
Eigenschaften - Teil 1: Produktspezifische Merkmale der Schallabsorption in diffusen
Schallfeldern
Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination
de la performance acoustique - Partie 1 : Caractéristique intrinsèques de l'absorption
acoustique dans des conditions de champ acoustique diffus
Ta slovenski standard je istoveten z: prEN 1793-1
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
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2023
ICS 17.140.30; 93.080.30 Will supersede EN 1793-1:2017
English Version
Road traffic noise reducing devices - Test method for
determining the acoustic performance - Part 1: Intrinsic
characteristics of sound absorption under diffuse sound
field conditions
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 1 : Caractéristique 1: Produktspezifische Merkmale der Schallabsorption
intrinsèques de l'absorption acoustique dans des in diffusen Schallfeldern
conditions de champ acoustique diffus
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 1793-1:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations . 7
5 Test arrangement . 8
6 Test procedure and evaluation . 13
6.1 Test method . 13
6.2 Single-number rating of sound absorption DL . 16
α,NRD
7 Measurement uncertainty . 16
8 Test report . 16
Annex A (informative) On the realization of a diffuse sound field . 18
A.1 General . 18
A.2 Additional information on the diffuseness of the sound field in a reverberation room . 18
Annex B (normative) Guidance note on the use of the single-number rating DL . 20
α,NRD
Annex C (normative) Measurement uncertainty . 21
C.1 General . 21
C.2 Measurement uncertainty based upon reproducibility data . 21
C.3 Standard deviation of repeatability and reproducibility of the sound absorption
coefficient . 21
Annex D (normative) Test report template . 23
D.1 Overview . 23
D.2 Test object (example) . 24
D.3 Test situation (example) . 25
D.3.1 Test room and test arrangement . 25
D.3.2 Test equipment and test procedures . 26
D.3.3 Test conditions . 27
D.4 Test results (example) . 27
D.5 Measurement uncertainty (example) . 28
Bibliography . 29

European foreword
This document (prEN 1793-1:2023) has been prepared by Technical Committee CEN/TC 226 “Road
equipment”, the secretariat of which is held by AFNOR.
This document will supersede EN 1793-1:2017.
With respect to the superseded document, the following changes have been made:
— ISO/IEC Guide 98-3 and ISO 12999-2 have been added to the References;
— A clause for terms and definitions has been added (new Clause 3);
— An annex has been added explaining the physical hypotheses under the assumption of a diffuse
sound field (Annex A);
— An annex with the values of the standard deviation of reproducibility and repeatability has been
added; this makes possible the declaration of the measurement uncertainty and the related
confidence level, which is now mandatory (Annex C);
— The detailed example has been improved to include the declaration of the uncertainty (Annex D);
— The Bibliography has been updated.
EN 1793-1:2023 is part of a series and should be read in conjunction with the following:
— 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 traffic noise reducing devices — Test method for determining the acoustic
performance — Part 3: Normalized traffic noise spectrum;
— EN 1793-4:2023, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 4: Intrinsic characteristics — Intrinsic sound diffraction;
— EN 1793-5:2023, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 5: Intrinsic characteristics — Sound absorption under direct sound field
conditions;
— EN 1793-6:2023, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 6: Intrinsic characteristics — Airborne sound insulation under direct sound field
conditions.
Introduction
Where a sound reflecting surface is installed along a road, it may be effective to use sound absorbing
devices on its traffic side to reduce additional noise nuisance caused by reflected sound. This treatment
may be needed in the presence of the following:
— noise barriers, rocks or retaining walls that can reflect sound waves toward unprotected areas;
— vertical cuttings or reflective surfaces that face each other;
— tunnels and their approaches;
— traffic passing close to a barrier where reflections between the vehicles and the barrier may reduce
effectiveness.
This document specifies a test method for qualifying the sound absorption performance of noise
reducing devices designed for roads (a measure of intrinsic performance). It is not concerned with
determining insertion loss (extrinsic performance) which depends on additional factors which are not
related to the product itself, e.g. the dimensions of the barrier and quality of installation work and site
factors such as ground impedance, site geometry etc. The test is designed to allow the intrinsic sound
absorption performance of the device to be measured under diffuse sound field conditions; the
resulting rating should aid the selection of devices for particular roadside applications.
More information on the realization of a diffuse sound field is given in Annex A.
The measurement results of this method for sound absorption are not directly comparable with the
results of the direct sound field method (EN 1793-5), mainly because the present method uses a diffuse
sound field, while the direct sound field method assumes a directional sound field. The test method
described in the present document should not be used to determine the intrinsic characteristics of
sound absorption for noise reducing devices to be installed on roads under non-reverberant conditions.
Research studies suggest that some correlation exists between laboratory data, measured according to
EN 1793-5 [5] and laboratory data, measured according to the method described in this document [1],
[2], [3], [4].
For the purpose of this document, reverberant conditions are defined based on the envelope, e, across
the road formed by the device under test, trench sides or buildings (the envelope does not include the
road surface) as shown by the dashed lines in Figure 1. Conditions are defined as being reverberant
when the percentage of open space in the envelope, w, is less than or equal to 25 %, i.e. reverberant
conditions occur when w/e ≤ 0,25, where e = (w + h + h ) or e = (w + h ) as per Figure 1.
1 2 1
This method may be used to qualify noise reducing devices for other applications, e.g. to be installed
nearby industrial sites. In this case the single-number ratings should be calculated using an appropriate
spectrum.
a) Partial cover on both sides of the road; b) Partial cover on one side of the road;
geometric envelope, e = w+h +h geometric envelope, e = w+h
1 2 1
c) Deep trench; d) Tall barriers or buildings;
geometric envelope, e = w+h +h geometric envelope, e = w+h +h
1 2 1 2
Key
r road surface
w width of open space
h developed length of element, e.g. cover, trench side, barrier or building
h developed length of element, e.g. cover, trench side, barrier or building
NOTE Figure 1 is not to scale.
Figure 1 — Sketch of the reverberant condition check in four cases
1 Scope
This document specifies the laboratory method for measuring the sound absorption performance of
road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic
sound absorption performance of devices that can reasonably be assembled inside the testing facility
described in EN ISO 354.
This method is not intended for the determination o
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