The prediction of road traffic noise reducing devices has been extensively studied and the advantages of available methods (empirical, geometrical and numerical) are well known. But the prediction of the efficiency of road barriers still remains problematic as barriers are designed in more sophisticated shapes, with various materials of different acoustical properties. In parallel, the development of porous road surfaces is indirectly an interesting contribution to road traffic noise control because they bring sound absorbtion and reduce the emission of rolling noise. Because noise barriers performances are limited, such road surfaces are sometimes prescribed in conjunction, expecting that it will significantly reduce noise emission and propagation. However, this is still an empirical technique and there is a lack for a prediction of combined effect. Thus, the aim of this study is to develop a global model for individual or combined efficiency of this road noise reducing techniques, integrating all main parameters, i.e. geometry and acoustical properties of barriers, grounds and road surfaces. A 2-D Boundary Element Method (BEM) was developed in which diffraction effects and boundary conditions effects were validated, including local reaction and extended reaction type best adapted to porous road surfaces.
The prediction of combined effect of road noise barrier and porous road surface by BEM
Vorhersage der kombinierten Wirkung von Lärmschutzwand und poröser Straßenoberfläche mit Hilfe der Rand Elemente Methode
1996
6 Seiten, 4 Bilder, 4 Quellen
Conference paper
English
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