SIST EN 1793-1:2017
(Main)Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 1: Intrinsic characteristics of sound absorption under diffuse sound field conditions
Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 1: Intrinsic characteristics of sound absorption under diffuse sound field conditions
This European Standard 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 of the intrinsic characteristics of sound absorption of noise reducing devices to be installed on roads in non-reverberant conditions.
The test method in EN ISO 354 referred to in this European Standard excludes devices that act as weakly damped resonators. Some devices will depart significantly from these requirements and in these cases care is needed in interpreting the results.
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 1: Produktspezifische Merkmale der Schallabsorption in diffusen Schallfeldern
Diese Europäische Norm legt das Laborprüfverfahren zur Ermittlung der Schallabsorptionseigenschaften von Straßenlärmschutzvorrichtungen in halligen Umgebungen fest. Sie ist bei der Bewertung der produktspezifischen Schallabsorptionseigenschaften derjenigen Lärmschutzvorrichtungen anzuwenden, die für den Einbau in die in EN ISO 354 beschriebene Prüfeinrichtung geeignet sind.
Dieses Verfahren ist nicht zur Bestimmung der produktspezifischen Schallabsorptionseigenschaften von Lärmschutzvorrichtungen vorgesehen, die an Straßen in nicht halligen Umgebungen zu installieren sind.
Das in EN ISO 354 festgelegte Prüfverfahren, worauf in dieser Europäischen Norm Bezug genommen wird, schließt Lärmschutzvorrichtungen aus, die als schwach gedämpfte Resonatoren wirken. Einige Vorrichtungen weichen beträchtlich von diesen Anforderungen ab; in diesen Fällen sind die Abweichungen bei der Interpretation der Ergebnisse sorgfältig zu beachten.
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
Cette Norme européenne spécifie la méthode de laboratoire utilisée pour mesurer les performances d'absorption acoustique des dispositifs de réduction du bruit du trafic routier dans des conditions réverbérantes. Elle traite de l'évaluation des performances d'absorption acoustique intrinsèque des dispositifs de réduction du bruit en bordure de voies qui peuvent raisonnablement être assemblés à l'intérieur de l'installation d'essai décrite dans l'EN ISO 354.
Cette méthode n'est pas destinée à la détermination des caractéristiques intrinsèques de l'absorption acoustique des dispositifs de réduction du bruit à être installés sur les routes dans des conditions non réverbérantes.
La méthode d'essai décrite dans l'EN ISO 354, citée en référence dans la présente Norme européenne, exclut les dispositifs qui agissent comme des résonateurs faiblement amortis. Certains dispositifs s'éloignent de façon significative de ces exigences et dans ces cas, l'interprétation des résultats doit être faite avec prudence.
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih lastnosti - 1. del: Karakteristike, značilne za absorpcijo zvoka pri razpršenem zvočnem polju
Ta evropski standard določa laboratorijsko metodo za merjenje absorpcije zvoka protihrupnih ovir za cestni promet v odmevnih pogojih. Zajema vrednotenje značilne absorpcije zvoka ovir, ki jih je mogoče razumno sestaviti v laboratoriju, opisanem v standardu EN ISO 354.
Ta metoda ni namenjena ugotavljanju karakteristik, značilnih za absorpcijo zvoka protihrupnih ovir za namestitev na cestah v neodmevnih pogojih.
Preskusna metoda iz standarda EN ISO 354, ki je navedena v tem evropskem standardu, se ne uporablja za ovire, ki delujejo kot rahlo dušeni resonatorji. Pri ovirah, ki so precej neskladne s temi zahtevami, je pri razlagi rezultatov potrebna visoka stopnja previdnosti.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 1793-1:2017
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
SIST EN 1793-1:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 1793-1:2017
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SIST EN 1793-1:2017
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.
---------------------- Page: 3 ----------------------
SIST EN 1793-1:2017
EN 1793-1:2017 (E)
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
2
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SIST EN 1793-1:2017
EN 1793-1:2017 (E)
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;
3
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SIST EN 1793-1:2017
EN 1793-1:2017 (E)
— 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.
4
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SIST EN 1793-1:2017
EN 1793-1:2017 (E)
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.
5
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SIST EN 1793-1:2017
EN 1793-1:2017 (E)
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
6
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SIST EN 1793-1:2017
EN 1793-1:2017 (E)
1 Scope
This European Standard 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 of the intrinsic characteristics of sound absorption of
noise reducing devices to be installed on roads in non-reverberant conditions.
The test method in EN ISO 354 referred to in this European Standard excludes devices that act as
weakly damped resonators. Some devices will depart significantly from these requirements and in
these cases, care is needed in interpreting the results.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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, Road traffic noise reducing devices - Test method for determining the acoustic performance -
Part 3: Normalized traffic noise spectrum
EN ISO 354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
ISO 9613-1, Acoustics — Attenuation of sound during propagation outdoors — Part 1: Calculation of the
absorption of sound by the atmosphere
3 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
Symbol or Designation Unit
abbreviation
th
α Sound absorption coefficient in the i one-third octave band -
NRDi
2
A Equivalent sound absorption area of the empty reverberation room m
1
2
A Equivalent sound absorption area of the reverberation room containing a test m
2
specimen
2
A Equivalent sound absorption area of the test specimen m
T
−1
c Propagation speed of sound in air in the empty reverberation room ms
1
−1
c Propagation speed of sound in air in the reverberation room with the test ms
2
specimen during the measurement
DL Single-number rating of sound absorption performance expressed as a dB
α,NRD
difference of A weighted sound pressure levels
L Length of the test panels on one side of the post m
th
L Normalized A weighted sound pressure level of traffic noise in the i one-third dB
i
octave band defined in EN 1793–3
7
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SIST EN 1793-1:2017
EN 1793-1:2017 (E)
Symbol or Designation Unit
abbreviation
−1
m Power attenuation coefficient calculated according to ISO 9613-1 using the m
1
climatic conditions that have been present in the empty reverberation room
during the measurement. The value of m can be calculated from the
attenuation coefficient, α, which is used in ISO 9613-1
−1
m Power attenuation coefficient calculated according to ISO 9613-1 using the m
2
climatic conditions that have been present in the reverberation room with the
test specimen during the measurement. The value of m can be calculated from
the attenuation coefficient, α, which is used in ISO 9613-1
2
S Area (of the floor of the reverberation room) covered by the test specimen m
T Reverberation time of the empty reverberation room s
1
T Reverberation time of the reverberation room after the test specimen has been s
2
introduced
3
V Net volume of the empty reverberation room m
1
3
V Net volume of the reverberation room containing a test specimen m
2
3
V Net volume of the test sample m
s
4 Test arrangement
The test arrangement shall be as described in EN ISO 354, with the following modifications.
— The test specimen shall be assembled in the test chamber in the same manner as the manufactured
device is used in practice, with the same connections and seals between the component parts.
— All the reflecting parts exposed on the road traffic side of the material (posts, brackets and other
parts) shall be present on the specimen as in practice.
— Where posts are employed in construction, at least one post shall be included in the specimen with
panels attached on both sides. The length of the panels on one side of the post shall be L ≥ 2 m
(Figures 2 and 3). The side that would face the road traffic shall face the inner part of the room
(Figures 2 and 3). The post shall be sealed as in practice.
— The test specimen shall have a reflecting frame sealed against it on its entire perimeter and without
any gap between the frame and the surface on which the test specimen is placed (Figures 2 to 6).
— The test specimen shall be placed directly against one of the surfaces (floor, wall or ceiling) of the
chamber without any gap (Figures 2, 3 and 4). A dense filling material, such as sand or concrete
3
(density > 200 kg/m ), shall always be inserted between the panels and chamber surface to
completely fill all gaps.
— If the sample under test includes a plenum as part of the design,
...
SLOVENSKI STANDARD
oSIST prEN 1793-1:2015
01-julij-2015
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: 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
oSIST prEN 1793-1:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN 1793-1:2015
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oSIST prEN 1793-1:2015
EUROPEAN STANDARD
DRAFT
prEN 1793-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2015
ICS 17.140.30; 93.080.30 Will supersede 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 - Méthode Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur
d'essai pour la détermination de la performance acoustique Bestimmung der akustischen Eigenschaften - Teil 1:
- Partie 1 : Caractéristique intrinsèques de l'absorption Produktspezifische Merkmale der Schallabsorption in
acoustique dans des conditions de champ acoustique diffus diffusen Schallfeldern
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
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1793-1:2015 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 1793-1:2015
prEN 1793-1:2015 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .6
2 Normative references .6
3 Symbols .6
4 Test arrangement .7
5 Test procedure and evaluation . 10
5.1 Test method . 10
5.2 Single-number rating of sound absorption DL . 13
α
6 Test report . 13
6.1 Expression of results . 13
6.2 Further information. 13
Annex A (informative) Guidance note on use of the single number rating DL . 15
α
Annex B (informative) Measurement uncertainty . 16
B.1 General . 16
B.2 Measurement uncertainty based upon reproducibility data . 16
Annex C (informative) Example test report . 17
C.1 Overview . 17
C.2 Test object (example) . 18
C.3 Test situation (example) . 20
C.3.1 Test room and test arrangement . 20
C.3.2 Test equipment and test procedures . 20
C.3.3 Test conditions . 21
C.4 Test results (example) . 21
Bibliography . 23
2
---------------------- Page: 4 ----------------------
oSIST prEN 1793-1:2015
prEN 1793-1:2015 (E)
Foreword
This document (prEN 1793-1:2015) 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 1793-1:2012.
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 the sound absorption coefficients α in each one-third octave band, as
Si
described in EN ISO 354, has been modified;
— 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;
— prEN 1793-5:2014, 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
---------------------- Page: 5 ----------------------
oSIST prEN 1793-1:2015
prEN 1793-1:2015 (E)
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 (prEN 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.
For the purpose of this European Standard, reverberant conditions are defined based on the envelope, e.g.
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 is less than or equal to 25 %, i.e. reverberant conditions occur
when w/e ≤ 0,25, where e = (w + h + h ).
1 2
Research studies suggest that some correlation exists between laboratory data, measured according to
prEN 1793-5 and laboratory data, measured according to the method described in this European Standard [1],
[2], [3], [4].
This method may be used to qualify noise-reducing devices for other applications, e.g. found along railways or
near industrial sites. In these cases, the single-number ratings should be calculated using an appropriate
spectrum.
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oSIST prEN 1793-1:2015
prEN 1793-1:2015 (E)
a) Partial cover on both sides of the road; b) Partial cover on one side of the road;
envelope, e = w + h + h e = w + h
1 2 1
c) Deep trench envelope, d) Tall barriers or buildings;
e = w + h + h envelope, e = w + h + h
1 2 1 2
Key
road surface
r
width of open space
w
NOTE Figure 1 is not to scale.
Figure 1 — Sketch of the reverberant condition check in four cases
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oSIST prEN 1793-1:2015
prEN 1793-1:2015 (E)
1 Scope
This European Standard 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 of the intrinsic characteristics of sound absorption of noise
reducing devices to be installed on roads in non-reverberant conditions.
The test method in EN ISO 354 referred to in this European Standard excludes devices that act as weakly
damped resonators. Some devices will depart significantly from these requirements and in these cases, care
is needed in interpreting the results.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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, Road traffic noise reducing devices - Test method for determining the acoustic performance -
Part 3: Normalized traffic noise spectrum
EN ISO 354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
ISO 9613-1, Acoustics - Attenuation of sound during propagation outdoors - Part 1: Calculation of the
absorption of sound by the atmosphere
3 Symbols
For the purposes of this document, the following symbols apply.
Table 1 — Symbols
Symbol or Designation Unit
abbreviation
2
A Equivalent sound absorption area of the empty reverberation room m
1
2
Equivalent sound absorption area of the reverberation room containing a test m
A
2
specimen
2
A Equivalent sound absorption area of the test specimen m
T
−2
Propagation speed of sound in air in the reverberation room with the test specimen ms
c
1
during the measurement
−2
c Propagation speed of sound in air in the empty reverberation ms
2
Single-number rating of sound absorption performance expressed as a difference dB
DL
α
of A-weighted sound pressure levels
Length of the test panels on one side of the post m
L
th
dB
L Normalized A-weighted sound pressure level of traffic noise in the i one-third
i
octave band defined in EN 1793–3
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oSIST prEN 1793-1:2015
prEN 1793-1:2015 (E)
−1
m Power attenuation coefficient calculated according to ISO 9613-1 using the climatic m
1
conditions that have been present in the empty reverberation room during the
measurement. The value of m can be calculated from the attenuation coefficient, α,
which is used in ISO 9613-1
−1
m Power attenuation coefficient calculated according to ISO 9613-1 using the climatic m
2
conditions that have been present in the reverberation room with the test specimen
during the measurement. The value of m can be calculated from the attenuation
coefficient, α, which is used in ISO 9613-1
2
S Area (of the floor of the reverberation room) covered by the test specimen m
Reverberation time of the empty reverberation room s
T
1
Reverberation time of the reverberation room after the test specimen has been s
T
2
introduced
3
Net volume of the empty reverberation room m
V
1
3
V Net volume of the reverberation room containing a test specimen m
2
3
Net volume of the test sample m
V
s
th
-
α Sound absorption coefficient in the i one-third octave band
Si
4 Test arrangement
The test arrangement shall be as described in EN ISO 354, with the following modifications.
— The test specimen shall be assembled in the test chamber in the same manner as the manufactured
device is used in practice, with the same connections and seals between the component parts.
— All the reflecting parts exposed on the road traffic side of the material (posts, brackets and other parts)
shall be present on the specimen as in practice.
— Where posts are employed in construction, at least one post shall be included in the specimen with
panels attached on both sides. The length of the panels on one side of the post shall be L ≥ 2 m
(Figures 2 and 3). The side that would face the road traffic shall face the inner part of the room (Figures 2
and 3). The post shall be sealed as in practice.
— The test specimen shall have a reflecting frame sealed against it on its entire perimeter (Figures 2 to 6).
— For testing noise-reducing devices, the specimen shall be placed directly against one of the surfaces
(floor, wall or ceiling) of the chamber without any gap (Figures 2, 3, and 4). If needed, concrete, used as
filler, shall be inserted between panels and chamber surface.
— If the sample under test includes a plenum as part of the design, this shall be reproduced in the
reverberation r
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