prEN 1793-2
(Main)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
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
This document specifies the laboratory method for measuring the airborne sound insulation performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic performance of barriers that can reasonably be assembled inside the testing facility described in EN ISO 10140-2 and EN ISO 10140-4.
This method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed on roads in non-reverberant conditions.
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 2: Produktspezifische Merkmale der Luftschalldämmung in diffusen Schallfeldern
Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination de la performance acoustique - Partie 2 : Caractéristiques intrinsèques de l'isolation aux bruits aériens dans des conditions de champ acoustique diffus
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih lastnosti - 2. del: Karakteristike, značilne za izolacijo pred zvokom v zraku pri razpršenem zvočnem polju
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2023
Nadomešča:
SIST EN 1793-2:2018
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih
lastnosti - 2. del: Karakteristike, značilne za izolacijo pred zvokom v zraku pri
razpršenem zvočnem polju
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
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen
Eigenschaften - Teil 2: Produktspezifische Merkmale der Luftschalldämmung in diffusen
Schallfeldern
Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination
de la performance acoustique - Partie 2 : Caractéristiques intrinsèques de l'isolation aux
bruits aériens dans des conditions de champ acoustique diffus
Ta slovenski standard je istoveten z: prEN 1793-2
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 1793-2:2018
English Version
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
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 2 : Caractéristiques 2: Produktspezifische Merkmale der
intrinsèques de l'isolation aux bruits aériens dans des Luftschalldämmung 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 1793-2:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols and abbreviations . 8
5 Test arrangement . 8
6 Test procedure and evaluation . 9
6.1 Test method . 9
6.2 Single-number rating of airborne sound insulation, DL . 9
R
6.3 Expression of results . 10
7 Measurement uncertainty . 10
8 Test report . 11
Annex A (informative) Guidance note on the use of the single-number rating DL . 12
R
Annex B (normative) Measurement uncertainty . 13
B.1 General . 13
B.2 Measurement uncertainty based upon reproducibility data . 13
B.3 Standard deviation of repeatability and reproducibility of the sound reduction index . 13
Annex C (normative ) Test report template . 15
C.1 Overview . 15
C.2 Test object (example) . 16
C.3 Test situation (example) . 18
C.3.1 Test rooms and test arrangement . 18
C.3.2 Test equipment and test procedures . 20
C.3.3 Test conditions . 20
C.4 Test results (example) . 20
C.5 Measurement uncertainty (example) . 21
Bibliography . 23
European foreword
This document (prEN 1793-2:2023) 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 1793-2:2018.
EN 1793-2:2023 includes the following significant technical changes with respect to EN 1793-2:2018:
— The title has been slightly changed.
— The declaration of measurement uncertainty and the related confidence level is now mandatory.
— The categories of single-number rating have been removed. Prior Annex A has been deleted. 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.
— 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 B).
— A detailed example has been added, including the declaration of the uncertainty (Annex C).
EN 1793-3:2023 is part of a series of documents and will be read in conjunction with 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 1793-3:2023, 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
Noise reducing devices alongside roads should provide adequate sound insulation so that sound
transmitted through the device is not significant compared with the sound diffracted over the top. This
document specifies a test method for qualifying the intrinsic airborne sound insulation performance for
noise reducing devices designed for roads in reverberant conditions, e.g. inside tunnels or deep
trenches or under covers.
The measurement results of this method for airborne sound insulation are comparable but not identical
with the results of the test method EN 1793-6:2021, mainly because the present method uses a diffuse
sound field, while the other method assumes a directional sound field. Research studies suggest that
good correlation exists between field data, measured according to EN 1793-6:2021 and laboratory data,
measured according to the method described in the present document [1], [2], [3], [4].
This document is not concerned with determining insertion loss (extrinsic performance) which
additionally depends on 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 airborne sound insulation performance of the device to be
measured; the resulting rating should aid the selection of devices for reverberant roadside applications.
For the purpose of this document reverberant conditions are defined based on the geometric envelope,
e, across the road formed by the barriers, trench sides or buildings (the geometric 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 geometric envelope is less than or equal to 25 %,
i.e. reverberant conditions occur when w/e ≤ 0,25, where e = (w+h +h ).
1 2
NOTE This method can 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 can preferably 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
h2 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 airborne sound insulation
performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment
of the intrinsic performance of barriers that can reasonably be assembled inside the testing facility
described in EN ISO 10140-2 and EN ISO 10140-4.
This method is not intended for the determination of the intrinsic characteristics of airborne sound
insulation of noise reducing devices to be installed on roads in non-reverberant conditions.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1793-3:2021, Road traffic noise reducing devices - Test method for determining the acoustic
performance – Part 3: Normalized traffic noise spectrum
EN ISO 10140-1:2016, Acoustics - Laboratory measurement of sound insulation of building elements –
Part 1: Application rules for specific products (ISO 10140-1)
EN ISO 101
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.