Work

Low frequency sound attenuation in a flow duct using a thin slow sound material

Year: 2016

Type: article

Abstract: A thin subwavelength material that can be flush mounted in a duct and that gives an attenuation band at low frequencies in air flow channels is presented. To decrease the material thickness, the sound is slowed in the material using folded side branch tubes. The impedance of the material is compared to the optimal value given by the Cremer condition, which can differ greatly from the air characteristic impedance. Grazing flow on this material increases the losses at the interface between the flow and the material.

Source: The Journal of the Acoustical Society of America

DOI: 10.1121/1.4951028

Authors: Yves Aurégan, Maaz Farooqui, Jean-Philippe Groby

Institutions: Centre National de la Recherche Scientifique, Le Mans Université, Laboratoire d'Acoustique de l'Université du Mans, Ain Shams University

Language: English

Topic: Acoustic Wave Phenomena Research

Subfield: Acoustics and Ultrasonics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: European Commission, Agence Nationale de la Recherche, FP7 People: Marie-Curie Actions