Objetivo 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. Ámbito científico engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringsensors Programa(s) FP3-MAT - Specific research and technological development programme (EEC) in the field of measurements and testing, 1990-1994 Tema(s) Data not available Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador Acoustical Technologies Aportación de la UE Sin datos Dirección 215,Avenue Brugmann 1180 Bruxelles Bélgica Ver en el mapa Coste total Sin datos Participantes (3) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo Centre National de la Recherche Scientifique (CNRS) Francia Aportación de la UE Sin datos Dirección Rue Maurice Audin 69518 Vaulx-en-Velin Ver en el mapa Coste total Sin datos FRAUNHOFER IAF Alemania Aportación de la UE Sin datos Dirección Tullastr. 72 79108 MÜNCHEN Ver en el mapa Enlaces Sitio web Opens in new window Coste total Sin datos UNIVERSITY OF BOLOGNA Italia Aportación de la UE Sin datos Dirección Via Zamboni 33 40126 BOLOGNA Ver en el mapa Coste total Sin datos
