Centre National De La Recherche Scientifique

Université Paris—sud

Université Du Mans

Yves Auregan

Elie Lefeuvre

Alexandre Houdouin

Nourdin Yaakoubi

Emile Martincic

Stéphane Durand

A passive sound absorber includes a cavity opening to the outside via an input direction to form a Helmholtz resonator for a first frequency. The absorber further includes at least one moving element, or wafer, suspended or held by suspensions in a position obstructing the neck in a non-sealed manner. The relative stiffness of the suspensions and the wafer is determined so that the assembly resonates in a vibration in a 'piston' movement at a second frequency different from the first frequency, achieving absorption for this second frequency or frequency range. A hybrid version includes a coil that is controlled to adjust the acoustic impedance of the absorber. An acoustic wall includes a plurality of such absorbers produced by a repetitive structure opening through perforations, each receiving such a wafer, and a method of designing and manufacturing such an absorber or wall is also provided.

Acoustic absorber, acoustic wall and method for design and production

Growing community of inventors

Angers, France

Yves Auregan