ACOUSTIC ATTENUATION PANEL WITH IMPROVED PERFORMANCES IN LOW AND MEDIUM FREQUENCIES

An acoustic attenuation panel including: a main layer made of a porous material and having two opposite faces; a coating layer arranged on one of the two faces of the main layer; an adhesive film, arranged at the interface between the main layer and the coating layer to assemble same. The main layer is a body made of melamine resin foam having a density between 6 and 6.8 kg/mand a porosity rate between 0.978 and 0.984; the coating layer is a fabric with a density between 484 and 526 kg/mand a porosity rate between 0.771 and 0.817; the adhesive film is a film made of a thermoplastic material provided with holes passing through and having a surface density between 40 g/mand 56 g/m