Objectif This project aims to develop a new method of measuring the sound absorption, the airborne sound insulation, and the efficiency of road traffic noise reducing devices. The method developed must overcome problems encountered during the drafting of the related standard within CEN/BTS1/TC226/WG6 (road equipments - anti-noise devices):for part 1 of the standard, there is no satisfactory method to qualify the sound absorption of non-flat products;for part 5 of the standard "in-situ values of absorption and insulation", the existing method (AFNOR NF-S/31-089) has limitations in the low frequency range (100-400 Hz) and cannot be used with non-flat products.By permitting the in-situ characteristics of all types of road traffic noise reducing devices to be determined, the new test method will help to ensure the free circulation of these devices in Europe and will enable road engineers to control road traffic noise in the environment more effectively.Work Package 1 looked at different types of signals (echo-impulse and stationary), sensors and noise sources. Three relevant types of test samples, four existing methods and three new theoretical tools were investigated. Based on the results, a method is currently developed in Work Package 2 using M.L.S. (Maximum Length Sequences) with a single loudspeaker and sound pressure sensors. A method of subtracting the incident signal should allow measurements to be made down to 100 Hz. The use of multiple sensors is being investigated both theoretically and practically in order to solve problems with non-flat products. Champ scientifique engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringsensors Programme(s) FP3-MAT - Specific research and technological development programme (EEC) in the field of measurements and testing, 1990-1994 Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur Acoustical Technologies Contribution de l’UE Aucune donnée Adresse 215,Avenue Brugmann 1180 Bruxelles Belgique Voir sur la carte Coût total Aucune donnée Participants (3) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Centre National de la Recherche Scientifique (CNRS) France Contribution de l’UE Aucune donnée Adresse Rue Maurice Audin 69518 Vaulx-en-Velin Voir sur la carte Coût total Aucune donnée FRAUNHOFER IAF Allemagne Contribution de l’UE Aucune donnée Adresse Tullastr. 72 79108 MÜNCHEN Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée UNIVERSITY OF BOLOGNA Italie Contribution de l’UE Aucune donnée Adresse Via Zamboni 33 40126 BOLOGNA Voir sur la carte Coût total Aucune donnée
