Comparison between prediction and measurement of sound attenuation associated to ventilation network elements

Résumé et principaux résultats

Article présenté au 23e Congrès International d'Acoustique en septembre 2019
The AcouReVe Project (2015-2018) aimed to improve the knowledge and the quality of acoustic calculation in ventilation ductworks. Such calculations are based on simplified models and the main issue is the input data. For each component of the ductwork, acoustic insertion loss and/or sound generation due to air velocity has to be known. The present work concentrates on sound attenuation across different ventilation ductwork elements, such as bends, branches and manifold. A 2D prediction method was developed; it involves a multimodal model for elements associated to guided waves propagation and a finite elements model for complex elements. Measurements have been performed at CETIAT laboratory on different elements; the experimental setup is described along with the different evaluated configurations. The comparison between the measured results, the predicted results as well as the results from simple standard formulas applicable for the considered elements is presented and discussed in detail.

Commissions

Ventilation des bâtiments résidentiels et tertiaires

Thème

Ventilation et qualité de l'air

Mots-clés

Accessoires de réseau, Acoustique, Mesure de bruit, Ventilation

Auteurs

BESSAC François