prEN 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

This document describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index.
The test method is intended for the following applications:
-   determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions;
-   determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use;
-   comparison of design specifications with actual performance data after the completion of the construction work;
-   verification of the long term performance of noise reducing devices (with a repeated application of the method);
-   interactive design process of new products, including the formulation of installation manuals.
The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.
Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported.

Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 6: Produktspezifische Merkmale - In-situ-Werte der Luftschalldämmung in gerichteten Schallfeldern

Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination de la performance acoustique - Partie 6 : Caractéristiques intrinsèques - Valeurs in situ d'isolation aux bruits aériens dans des conditions de champ acoustique di

Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih lastnosti - 6. del: Bistvene karakteristike - Terenske vrednosti izolirnosti pred zvokom v zraku pri usmerjenem zvočnem polju

General Information

• Status: Not Published
• Publication Date: 02-Jan-2024
• ICS: 17.140.30 - Noise emitted by means of transport
• ICS: 93.080.30 - Road equipment and installations
• Technical Committee: CEN/TC 226 - Road equipment
• Drafting Committee: CEN/TC 226/WG 6 - Noise reducing devices
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 16-Nov-2023
• Due Date: 15-Dec-2021
• Completion Date: 16-Nov-2023
• Ref Project: oSIST prEN 1793-6:2023 - 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

Relations

• Revises: EN 1793-6:2018+A1:2021 - 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
• Effective Date: 18-Jan-2023
• Revised: EN 1793-6:2018 - 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
• Effective Date: 04-Nov-2020

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2023
Nadomešča:
SIST EN 1793-6:2018+A1:2021
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih
lastnosti - 6. del: Bistvene karakteristike - Terenske vrednosti izolirnosti pred
zvokom v zraku pri usmerjenem zvočnem polju
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
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen
Eigenschaften - Teil 6: Produktspezifische Merkmale - In-situ-Werte der
Luftschalldämmung in gerichteten Schallfeldern
Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination
de la performance acoustique - Partie 6 : Caractéristiques intrinsèques - Valeurs in situ
d'isolation aux bruits aériens dans des conditions de champ acoustique di
Ta slovenski standard je istoveten z: prEN 1793-6
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.

CEN/TC 226
Date: 2023-03-31
Secretariat: AFNOR
Road traffic noise reducing devices — Test method for determining the
acoustic performance — Part 6: Intrinsic characteristics - Airborne sound
insulation under direct sound field conditions
Lärmschutzvorrichtungen an Straßen — Prüfverfahren zur Bestimmung der
akustischen Eigenschaften — Teil 6: Produktspezifische Merkmale —
Luftschalldämmung in gerichteten Schallfeldern
Dispositifs de réduction du bruit du trafic routier — Méthode d'essai pour la
détermination de la performance acoustique — Partie 6 : Caractéristiques
intrinsèques — Isolation au bruit aérien dans des conditions de champ acoustique
direct
CCMC will prepare and attach the official title page.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols and abbreviations . 13
5 Sound insulation index measurements . 15
5.1 General principle . 15
5.2 Measured quantity . 15
5.3 Test arrangement . 16
5.3.1 General. 16
5.3.2 Tests on purposely built full-size samples . 16
5.3.3 Tests on installed road traffic noise reducing devices . 16
5.3.4 Non-flat, inclined or curved road traffic noise reducing devices . 17
5.4 Measuring equipment . 23
5.4.1 Components of the measuring system . 23
5.4.2 Sound source . 23
5.4.3 Test signal . 23
5.5 Data processing . 24
5.5.1 Calibration . 24
5.5.2 Sample rate and filtering. 24
5.5.3 Background noise . 25
5.5.4 Scanning technique using nine microphones . 26
5.5.5 Adrienne temporal window . 26
5.5.6 Placement of the Adrienne temporal window . 28
5.5.7 Low-frequency limit . 29
5.6 Positioning of the measuring equipment . 30
5.6.1 Selection of the measurement positions . 30
5.6.2 Post measurements . 31
5.6.3 Additional measurements . 31
5.6.4 Reflecting objects . 31
5.6.5 Safety considerations . 31
5.7 Sample surface and meteorological conditions . 32
5.7.1 Condition of the sample surface . 32
5.7.2 Wind. 32
5.7.3 Air temperature. 32
5.8 Single-number rating . 32
5.8.1 General. 32
5.8.2 Acoustic elements . 32
5.8.3 Posts . 33
5.8.4 Global . 33
6 Measurement uncertainty . 34
7 Measuring procedure . 34
8 Test report . 35
Annex A (informative)  Low-frequency limit and window width . 37
Annex B (informative) Measurement uncertainty. 42
B.1 General . 42
B.2 Measurement uncertainty based upon reproducibility data . 42
B.3 Standard deviation of repeatability and reproducibility of the sound insulation
index . 42
Annex C (normative) Template of test report on airborne sound insulation of road traffic
noise reducing devices. 45
C.1 General . 45
C.2 Test setup (example) . 47
C.3 Test object and test situation (example) . 49
C.4 Results (example) . 51
C.4.1 Part 1 – Results for ‘element’ in tabular form . 51
C.4.2 Part 2 – Results for ‘element’ in graphic form . 52
C.4.3 Part 3 – Results for ‘post’ in tabular form . 53
C.4.4 Part 4 – Results for ‘post’ in graphic form . 54
C.4.5 Part 5 – Results for global condition (average of ‘element’ and ‘post’) in tabular form . 55
C.4.6 Part 6 – Results for global condition (average of ‘element’ and ‘post’) in graphic form . 56
C.5 Uncertainty (example) . 56
Annex D (informative) Indoor measurements for product qualification. 59
D.1 General . 59
D.2 Parasitic reflections . 59
D.3 Reverberation time of the room . 59
Bibliography . 60

European foreword
This document (prEN 1793-6:2023) 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 1793-6:2018+A1:2021.
EN 1793-6:2023 includes the following significant technical changes with respect to EN 1793-
6:2018+A1:2021:
— The definitions from 3.1 to 3.8 have been updated to be in accordance to the last version of EN
14388.
— The scanning technique is based on a nine-microphone grid; the use of a single microphone
displaced in nine positions has been abandoned.
— The formula to calculate the global single-number rating DL used in the previous version of
SI,G
this document has been changed.
— The use of categories of single-number rating is no longer permitted.
— One value for the standard deviation of reproducibility and repeatability in each one-third
octave frequency band has been retained, in place of three values (min, max and median) as
before (see Tables B.1 and B.2).
— The example in C.5 on the declaration of the measurement uncertainty has been updated
accordingly.
EN 1793-6:2023 is part of a series and should 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 1793-2:2023, 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
...