Multi-component acoustically resistive layer for acoutical attenuation panel and panel thus obtained

Multi-component acoustically resistive layer, for acoustical attenuation panels of the type constituted by a cellular core (1) flanked on the sound wave arrival side, by an acoustically damping layer (2) and, on the opposite side, by a rear reflector (3), characterized in that it is constituted:

• by a first structural component (4) in contact with the aerodynamic flow informed by at least one layer of fibers connected by a suitable resin and oriented in the direction of aerodynamic flow, said component (4) comprising a suitable open surface quantity;
• by a dissipating component (6) disposed against the surface of said first component (4) opposite said flow, formed by a metallic cloth;
• and by a second structural component (7) formed of at least one layer of fibers connected by a suitable resin, oriented orthogonally to said direction of aerodynamic flow, said second structural component (7) being connected to said cellular core (1) and comprising a suitable open surface quantity.