EN 1793-1:2017

SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST EN 1793-1:2013
3URWLKUXSQHRYLUH]DFHVWQLSURPHW3UHVNXVQDPHWRGD]DXJRWDYOMDQMHDNXVWLþQLK
ODVWQRVWLGHO.DUDNWHULVWLNH]QDþLOQH]DDEVRUSFLMR]YRNDSULUD]SUãHQHP
]YRþQHPSROMX
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: EN 1793-1:2017
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.

EN 1793-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2017
EUROPÄISCHE NORM
ICS 17.140.30; 93.080.30 Supersedes EN 1793-1:2012
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 European Standard was approved by CEN on 6 February 2017.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1793-1:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 5
1 Scope . 7
2 Normative references . 7
3 Symbols and abbreviations . 7
4 Test arrangement . 8
5 Test procedure and evaluation . 13
5.1 Test method . 13
5.2 Single number rating of sound absorption DL . 16
α,NRD
6 Test report . 16
6.1 Expression of results . 16
6.2 Further information . 17
Annex A (informative) Guidance note on the use of the single number rating DL . 18
α,NRD
Annex B (informative) Measurement uncertainty . 19
B.1 General . 19
B.2 Measurement uncertainty based upon reproducibility data . 19
Annex C (informative) Example test report . 20
C.1 Overview . 20
C.2 Test object (example) . 21
C.3 Test situation (example) . 22
C.3.1 Test room and test arrangement . 22
C.3.2 Test equipment and test procedures . 23
C.3.3 Test conditions . 24
C.4 Test results (example) . 24
Bibliography . 26

European foreword
This document (EN 1793-1:2017) has been prepared by Technical Committee CEN/TC 226 “Road
equipment”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2017, and conflicting national standards
shall be withdrawn at the latest by September 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1793-1:2012.
With respect to the superseded document, the following changes have been made:
— the description of the test arrangement has been improved;
— the method for determining sound absorption coefficients in each one-third octave band, as
described in EN ISO 354, has been modified: the Sabine absorption coefficient α has been replaced
Si
by a new absorption coefficient α that is specific to noise reducing devices and which takes
NRD,i
account of the volume of the test sample (the new coefficient α might be derived from α );
NRD,i Si
— the contents of the test report have been better defined;
— the declaration of the measurement uncertainty and the related confidence level is now mandatory.
The reported uncertainties have an impact on the determination of informative categories of single
number rating performance; depending on the performance of the product this could potentially
result in products being 'downgraded' to a lower category. As a result, the informative annex
addressing categories of single number rating has been removed. The performance of the noise
reducing device is, from now on, only to be reported in terms of the numeric values of the single
number rating;
— a detailed example is presented (Annex C).
EN 1793-1 is part of a series and should be read in conjunction with the following:
— EN 1793-2, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 2: Intrinsic characteristics of airborne sound insulation under diffuse sound field
conditions;
— EN 1793-3, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 3: Normalized traffic noise spectrum;
— EN 1793-4, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 4: Intrinsic characteristics — In situ values of sound diffraction;
— EN 1793-5, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 5: Intrinsic characteristics — In situ values of sound reflection under direct
sound field conditions;
— EN 1793-6, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 6: Intrinsic characteristics — In situ values of airborne sound insulation under
direct sound field conditions.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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 European Standard 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.
The measurement results of this method for sound absorption are not directly comparable with the
results of the in situ method (EN 1793-5), mainly because the present method uses a diffuse sound field,
while the in situ 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 and laboratory data, measured according to the method described in this European Standard
[1], [2], [3], [4].
For the purpose of this European Standard, 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;
envelope, e = w+h +h envelope, e = w+h
1 2 1
c) Deep trench; d) Tall barriers or buildings;
envelope, e = w+h +h envelope, e = w+h +h
1 2 1 2
Key
r road surface
w width of open space
NOTE Figure 1 is not to scale.
Figure 1 — Sketch of the reverberant condition check in four cases
1 Scope
This European Standard specifies the laboratory method for measuring the sound absorption
performance of road traffic noise reducing devices in reverberant condi
...