prEN 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

This European Standard describes a test method for measuring a quantity representative of the intrinsic characteristics of sound reflection from road noise reducing devices: the reflection index.
The test method is intended for the following applications:
- determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed along roads, to be measured either on typical installations alongside roads or on a relevant sample section;
- determination of the in situ intrinsic characteristics of sound reflection 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).
The test method is not intended for the following applications:
- determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches.
Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in a restricted frequency range and the reasons of the restriction(s) shall be clearly reported.

Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 5: Produktspezifische Merkmale - In-situ-Werte der Schallreflexion in gerichteten Schallfeldern

Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination de la performance acoustique - Partie 5: Caractéristiques intrinsèques - Valeurs in situ de réflexion acoustique dans des conditions de champ acoustique direct

Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih lastnosti - 5. del: Bistvene lastnosti - Terenske vrednosti odboja zvoka z uporabo usmerjenega zvočnega polja

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 1793-5:2023 - 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

Relations

• Revises: EN 1793-5:2016/AC:2018 - 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
• Effective Date: 19-Jan-2023
• Revises: EN 1793-5:2016 - 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
• Effective Date: 04-Nov-2020

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2023
Nadomešča:
SIST EN 1793-5:2016/AC:2018
Protihrupne ovire za cestni promet - Preskusna metoda za ugotavljanje akustičnih
lastnosti - 5. del: Bistvene lastnosti - Terenske vrednosti odboja zvoka z uporabo
usmerjenega zvočnega polja
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
Lärmschutzvorrichtungen an Straßen - Prüfverfahren zur Bestimmung der akustischen
Eigenschaften - Teil 5: Produktspezifische Merkmale - In-situ-Werte der Schallreflexion
in gerichteten Schallfeldern
Dispositifs de réduction du bruit du trafic routier - Méthode d'essai pour la détermination
de la performance acoustique - Partie 5: Caractéristiques intrinsèques - Valeurs in situ
de réflexion acoustique dans des conditions de champ acoustique direct
Ta slovenski standard je istoveten z: prEN 1793-5
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: 2022-09-19
CEN/TC 226
Secretariat: AFNOR
Road traffic noise reducing devices — Test method for determining the acoustic
performance — Part 5: Intrinsic characteristics — Sound absorption under direct sound
field conditions
Lärmschutzeinrichtungen an Straßen — Prüfverfahren zur Bestimmung der akustischen
Eigenschaften — Teil 5: Produktspezifische Merkmale — Schallabsorption in gerichteten
Schallfeldern
Dispositifs de réduction du bruit du trafic routier — Méthode d’essai pour la détermination
de la performance acoustique — Partie 5 : Caractéristiques intrinsèques — Absorption
acoustique dans des conditions de champ acoustique direct

ICS: 17.140.30, 93.080.30
Descriptors:
Document type: European Standard
Document subtype:
Document stage:  CEN Enquiry
Document language: E
C:\Users\massimo.garai\Documents\CEN TC226 WG6\EN 1793-5 2018-2022\EN 1793-5 2022-09-19\TG1
N619 prEN 1793-5 2022-09-19.docx STD Version 2.5a

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Symbols and abbreviations . 13
5 Sound reflection index measurements . 15
5.1 General principle . 15
5.2 Measured quantity . 15
5.3 Test arrangement . 19
5.3.1 Tests on purposely built full -size samples . 19
5.3.2 Installed road traffic noise reducing devices . 20
5.3.3 Inclined or curve road traffic noise reducing devices . 21
5.4 Measuring equipment . 25
5.4.1 Components of the measuring system . 25
5.4.2 Sound source . 25
5.4.3 Test signal . 26
5.5 Data processing . 27
5.5.1 Calibration . 27
5.5.2 Sample rate and filtering . 28
5.5.3 Background noise . 29
5.5.4 Signal subtraction technique . 30
5.5.5 Accurate alignment procedure . 31
5.5.6 Adrienne temporal window . 33
5.5.7 Placement of the Adrienne temporal window . 35
5.5.8 Maximum sampled area. 37
5.6 Positioning of the measuring equipment . 37
5.6.1 General . 37
5.6.2 Selection of the measurement positions. 38
5.6.3 Consideration of relevant and parasitic reflections . 46
5.6.4 Low-frequency limit . 49
5.6.5 Reflecting objects . 49
5.6.6 Safety considerations. 50
5.7 Sample surface and meteorological conditions . 50
5.7.1 Condition of the sample surface . 50
5.7.2 Wind . 50
5.7.3 Air temperature . 50
5.8 Single-number rating of sound absorption under a direct sound field DL . 50
RI
5.9 Measurement uncertainty . 51
5.10 Measuring procedure . 51
5.11 Test report . 52
Annex A (informative) Low-frequency limit and window width . 54
A.1 General . 54
Annex B (informative) Measurement uncertainty . 59
B.1 General . 59
B.2 Measurement uncertainty based upon reproducibility data . 59
B.3 Standard deviation of repeatability and reproducibility of the sound reflection index . 59
Annex C (normative) Template of test report on sound reflection index of road traffic noise
reducing devices . 61
C.1 General . 61
C.2 Test setup (example) . 64
C.3 Test object and test situation (example) . 65
C.4 Test Results (example) . 67
C.4.1 Part 1 – Results in tabular form . 67
C.4.2 Part 2 – Results in graphic form. 68
C.5 Uncertainty (example) . 68
Annex D (informative) Indoor measurements for product qualification . 70
D.1 General . 70
D.2 Parasitic reflections . 70
D.3 Reverberation time of the room . 70
Bibliography . 71

European foreword
This document (prEN 1793-5:2023) has been prepared under the direction of Technical Committee
CEN/TC 226 “Road equipment”, by Working Group 6 “Noise reducing devices”, the secretariat of which is
held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1793-5:2016.
EN 1793-5:2023 includes the following significant technical changes with respect to EN 1793-5:2016:
— The definitions from 3.1 to 3.7 have been updated to be in accordance to the last version of EN 14388.
— The single number rating DL is now reported with one decimal digit.
RI
— Annex A on the low-frequency limit and the window width has been added.
— 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
Table B.1).
— Annex C (template of the test report) is now normative.
— The example in C.5 on the declaration of the measurement uncertainty has been updated accordingly.
— Annex C of EN 1793-5:2016 has been deleted.
EN 1793-5:2023 is part of a series and should be read in conjunction with the the following:
EN 1793-1:2023, Road traffic noise reducing devices - Test method for determining the acoustic performance –
Part 1: 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 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 soun
...