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

Diese Europäische Norm legt das Laborprüfverfahren zur Ermittlung der Luftschalldämm-Eigenschaften von Lärmschutzwänden an Straßen unter halligen Bedingungen fest. Sie ist bei der Bewertung der produktspezifischen Eigenschaften derjenigen Lärmschutzvorrichtungen an Straßen anzuwenden, die für den Einbau in die in EN ISO 10140-2 und EN ISO 10140-4 beschriebene Prüfeinrichtung geeignet sind.
Dieses Verfahren gilt nicht zur Bestimmung der produktspezifischen Merkmale der Luftschalldämmung von Lärmschutzvorrichtungen an Straßen unter nicht halligen Bedingungen.

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

Le présent documentspécifie la méthode de laboratoire permettant de mesurer la performance d'isolation aux bruits aériens des dispositifs de réduction du bruit du trafic routier dans des conditions de réverbération. Elle traite de l'évaluation de la performance intrinsèque des écrans antibruit qui peuvent raisonnablement être assemblés à l'intérieur de l'installation d'essai décrite dans l'EN ISO 10140-2 et l'EN ISO 10140-4.
La présente méthode n'est pas destinée à la détermination des caractéristiques intrinsèques d'isolation aux bruits aériens des dispositifs de réduction du bruit devant être installés sur les routes dans des conditions non réverbérantes.

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

Ta evropski standard določa laboratorijsko metodo za merjenje lastnosti za izolacijo pred zvokom v zraku pri protihrupnih ovirah za cestni promet v odmevnih pogojih. Zajema vrednotenje značilnih lastnosti ovir, ki jih je mogoče razumno zbrati v laboratoriju, opisanem v standardih EN ISO 10140-2 in EN ISO 10140-4.
Ta metoda ni namenjena ugotavljanju karakteristik, značilnih za izolacijo pred zvokom v zraku, pri protihrupnih ovirah za namestitev na cestah v neodmevnih pogojih.

General Information

Status
Published
Publication Date
26-Jun-2018
Withdrawal Date
30-Dec-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
27-Jun-2018
Due Date
19-May-2018
Completion Date
27-Jun-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 2: Produktspezifische Merkmale der Luftschalldämmung in diffusen SchallfeldernDispositifs 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 diffusRoad traffic noise reducing devices - Test method for determining the acoustic performance - Part 2: Intrinsic characteristics of airborne sound insulation under diffuse sound field conditions93.080.30Cestna oprema in pomožne napraveRoad equipment and installations17.140.30Emisija hrupa transportnih sredstevNoise emitted by means of transportICS:Ta slovenski standard je istoveten z:EN 1793-2:2018SIST EN 1793-2:2018en,fr,de01-september-2018SIST EN 1793-2:2018SLOVENSKI
STANDARDSIST EN 1793-2:20131DGRPHãþD



SIST EN 1793-2:2018



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1793-2
June
t r s z ICS
s yä s v rä u râ
{ uä r z rä u r Supersedes EN
s y { uæ tã t r s tEnglish Version
Road traffic noise reducing devices æ Test method for determining the acoustic performance æ Part
tã Intrinsic characteristics of airborne sound insulation under diffuse sound field conditions Dispositifs de réduction du bruit du trafic routier æ Méthode d 5essai pour la détermination de la performance acoustique æ Partie
t ã Caractéristiques intrinsèques de l 5isolation aux bruits aériens dans des conditions de champ acoustique diffus
Lärmschutzvorrichtungen an Straßen æ Prüfverfahren zur Bestimmung der akustischen Eigenschaften æ Teil
tã Produktspezifische Merkmale der Luftschalldämmung in diffusen Schallfeldern This European Standard was approved by CEN on
s { February
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
9
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s y { uæ tã t r s z ESIST EN 1793-2:2018



EN 1793-2:2018 (E) 2 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 . 7 6 Test procedure and evaluation . 8 6.1 Test method . 8 6.2 Single-number rating of airborne sound insulation, DLR . 8 6.3 Expression of results . 9 7 Measurement uncertainty . 9 8 Test report . 9 Annex A (informative)
Categorization of single-number rating . 10 Annex B (informative)
Guidance note on the use of the single number rating DLR . 11 Annex C (informative)
Measurement uncertainty . 12 C.1 General . 12 C.2 Measurement uncertainty based upon reproducibility data . 12 Bibliography . 13
SIST EN 1793-2:2018



EN 1793-2:2018 (E) 3 European foreword This document (EN 1793-2:2018) 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 December 2018, and conflicting national standards shall be withdrawn at the latest by December 2018. 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 1793-2:2012. With respect to the superseded document, the following changes have been made: — The declaration of measurement uncertainty and the related confidence level is now mandatory. — The categories of single number rating have been removed from Annex A. 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. EN 1793-2 is part of a series of documents and will be read in conjunction with the following: — EN 1793-1, Road traffic noise reducing devices - Test method for determining the acoustic performance – Part 1: Intrinsic characteristics of sound absorption 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 organizations 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. SIST EN 1793-2:2018



EN 1793-2:2018 (E) 4 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, 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 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+h1+h2). 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. SIST EN 1793-2:2018



EN 1793-2:2018 (E) 5
a) Partial cover on both sides of the road; b) Partial cover on one side of the road; geometric envelope, e = w+h1+h2 geometric envelope, e = w+h1
c) Deep trench; d) Tall barriers or buildings; geometric envelope, e = w+h1+h2 geometric envelope, e = w+h1+h2 Key r road surface w width of open space h1 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 SIST EN 1793-2:2018



EN 1793-2:2018 (E) 6 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 perform
...

SLOVENSKI STANDARD
oSIST prEN 1793-2:2017
01-januar-2017
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ODVWQRVWLGHO.DUDNWHULVWLNH]QDþLOQH]DL]RODFLMRSUHG]YRNRPY]UDNXSUL
UD]SUãHQHP]YRþQHPSROMX
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
oSIST prEN 1793-2:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 1793-2:2017

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oSIST prEN 1793-2:2017


DRAFT
EUROPEAN STANDARD
prEN 1793-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

November 2016
ICS 17.140.30; 93.080.30 Will supersede EN 1793-2:2012
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey 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: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1793-2:2016 E
worldwide for CEN national Members.

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oSIST prEN 1793-2:2017
prEN 1793-2:2016 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Symbols and abbreviations . 6
4 Test arrangement . 6
5 Test procedure and evaluation . 8
5.1 Test method . 8
5.2 Single-number rating of airborne sound insulation, DL . 8
R
6 Measurement uncertainty . 8
7 Test report . 8
7.1 Expression of results . 8
7.2 Further information . 8
Annex A (normative) Categorisation of single-number rating . 10
Annex B (informative) Guidance note on the use of the single number rating DL . 11
R
Annex C (informative) Measurement uncertainty . 12
C.1 General . 12
C.2 Measurement uncertainty based upon reproducibility data . 12
Bibliography . 13

2

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oSIST prEN 1793-2:2017
prEN 1793-2:2016 (E)
European foreword
This document (prEN 1793-2:2016) 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 1793-2:2012.
With respect to the superseded document, the following changes have been made:
— The declaration of 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 in the
previous version of this European Standard that addressed 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.
EN 1793-2 is part of a series and should be read in conjunction with the following:
— EN 1793-1, Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 1: Intrinsic characteristics of sound absorption 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.
3

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oSIST prEN 1793-2:2017
prEN 1793-2:2016 (E)
Introduction
Noise reducing devices alongside roads need to provide adequate sound insulation so that sound
transmitted through the device is not significant compared with the sound diffracted over the top. This
European Standard 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, 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 and laboratory data, measured
according to the method described in the present document [1], [2], [3], [4].
The test method described in this European Standard should not be used to determine the intrinsic
characteristics of airborne sound insulation for noise reducing devices to be installed on roads in non-
reverberant conditions.
This European Standard 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 European Standard reverberant conditions are defined based on the geometric
envelope, e, across the road formed by the barriers, 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 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 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 will preferably be calculated using an appropriate
spectrum.
4

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oSIST prEN 1793-2:2017
prEN 179
...

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