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EN 1793-4:2025

Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - Intrinsic sound diffraction

Edition date: 2025-12-24
In Force
Available languages: French, English
Summary: This document specifies a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of road traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a road traffic noise reducing device with and without the added device installed on its top. The effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height (the method specified gives the acoustic benefit over a simple barrier of the same height; however, in practice the added device can raise the height and this could provide additional screening depending on the source and receiver positions). This document is applicable to: — the preliminary qualification, outdoors or indoors, of added devices to be installed on road traffic noise reducing devices; — the determination of sound diffraction index difference of added devices in actual use; — the comparison of design specifications with actual performance data after the completion of the construction work; — the verification of the long-term performance of added devices (with a repeated application of the method); — the interactive design process of new products, including the formulation of installation manuals. The test method can be applied both in situ and on samples purposely built to be tested using the method described here. 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 are given in the restricted frequency range and the reasons of the restriction(s) are clearly reported. A single-number rating is calculated from frequency data. For indoor measurements, see Annex D.

Le présent document spécifie une méthode d'essai permettant de déterminer les caractéristiques intrinsèques de la diffraction acoustique des dispositifs additionnels installés au sommet des dispositifs de réduction du bruit du trafic routier. La méthode d'essai prescrit des mesures du niveau de pression acoustique en différents points de référence situés près du bord supérieur d'un dispositif de réduction du bruit, du trafic routier avec et sans dispositif additionnel installé au sommet. L'efficacité du dispositif additionnel est calculée comme étant la différence entre les valeurs mesurées avec et sans dispositifs additionnels, avec une correction pour tout changement de hauteur (la méthode spécifiée indique l'avantage acoustique par rapport à une barrière simple de même hauteur; cependant, dans la pratique, le dispositif additionnel peut augmenter cette hauteur et fournir une atténuation supplémentaire en fonction des positions respectives de la source et du récepteur). Le présent document est applicable à: - la qualification préliminaire, à l'extérieur ou à l'intérieur de bâtiments, des dispositifs additionnels à installer sur les dispositifs de réduction du bruit du trafic routier; - la détermination de la différence d'indice de diffraction acoustique des dispositifs additionnels actuellement utilisés; - la comparaison des spécifications de conception avec des données de performance réelles de l'ouvrage de construction achevé; - la vérification des performances à long terme de dispositifs additionnels (par l'application répétée de la méthode); - le processus interactif de conception de nouveaux produits, y compris la formulation des manuels d'installation. La méthode d'essai peut être appliquée à la fois in situ et sur des échantillons construits spécifiquement pour être soumis à l'essai selon la méthode décrite dans le présent document. Les résultats sont exprimés en fonction de la fréquence, par bandes de tiers d'octave allant de 100 Hz à 5 kHz. S'il est impossible d'obtenir des résultats de mesure valables sur toute la plage de fréquences indiquée, les résultats sont donnés pour la plage de fréquences réduite et les raisons de la ou des restrictions sont clairement consignées. Un indice unique d'évaluation est calculé à partir des données de fréquence. Pour les mesures en intérieur, voir Annexe D.

Dieses Dokument legt ein Prüfverfahren zur Bestimmung der produktspezifischen Merkmale der Schallbeugung bei Wandaufsätzen fest, die auf Lärmschutzvorrichtungen an Straßen montiert werden. Das Prüfverfahren sieht Messungen des Schalldruckpegels an mehreren Bezugspunkten nahe der Oberkante der Lärmschutzvorrichtung an Straßen mit und ohne montierte Wandaufsätze vor. Die Wirksamkeit des Wandaufsatzes berechnet sich aus der Differenz aus den mit und ohne Wandaufsatz gemessenen Werten unter Berücksichtigung der Änderungen der Höhe (das festgelegte Verfahren hebt den akustischen Nutzwert gegenüber einer einfachen Schutzvorrichtung derselben Höhe hervor; allerdings kann der Wandaufsatz in der Praxis die Höhe vergrößern, wodurch wiederum in Abhängigkeit von Sender- und Empfangsposition eine zusätzliche Abschirmung bereitgestellt werden könnte). Dieses Dokument ist anwendbar für:  die im Freien oder in Innenräumen erfolgende Vorqualifizierung der Wandaufsätze, die auf Lärmschutzvorrichtungen an Straßen montiert werden;  die Bestimmung der Schallbeugungsindex-Differenz von Wandaufsätzen in der Praxis;  den Vergleich der Bemessungsfestlegungen mit den tatsächlichen Leistungsdaten nach Abschluss der Bauarbeiten;  die Überprüfung der Dauerhaftigkeit der Leistung von Wandaufsätzen (durch wiederholtes Anwenden des Verfahrens);  das interaktive Konstruktionsverfahren neuer Produkte, einschließlich der Erstellung von Montagehandbüchern. Das Prüfverfahren kann sowohl in situ als auch an Prüfkörpern, die speziell für die Prüfung unter Verwendung des hier beschriebenen Verfahrens hergestellt wurden, angewendet werden. Die Ergebnisse werden als Funktion der Frequenz in Terzbändern zwischen 100 Hz und 5 kHz angegeben. Ist es nicht möglich, gültige Messergebnisse über den gesamten Frequenzbereich zu gewinnen, werden die Ergebnisse für den eingeschränkten Frequenzbereich zusammen mit den Gründen für die Einschränkung(en) klar angegeben. Aus den Frequenzdaten wird eine Einzahl-Angabe berechnet. Hinsichtlich Messungen in Innenräumen siehe Anhang D.
ICS: 93.080.30-Road equipment and installations, 17.140.30-Noise emitted by means of transport
CTN: CEN/TC 226 - 6207

Reemplazo Normas

Reemplaza a EN 1793-4:2015

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