Airbus France

Aerospatiale Societe Nationale Industrielle

Herv&eacute; Batard

Alain Porte

Robert Andre

A process for the production of a panel ( ) with a fitted acoustically resistive layer, including at least one central core with porous structure bounded on one side by a structural layer covered with a porous acoustically resistive layer and, on the other side, by a total acoustical reflector, in which, successively, acoustically resistive strips are laid down to form the layer on a mold (M) shaped like the panel to be obtained, the structural layer is emplaced, the core of porous structure is emplaced, the total reflector is emplaced, then the mold (M) is withdrawn from the panel. When laying down on the mold (M) the acoustically resistive layer, the porosity of this latter is locally adapted to correspond with the characteristics of the sonic wave at the point of impact, the correlation between characteristics and impact region being previously determined by conventional acoustical techniques applied to a test panel identical to that to be produced.

Method for producing a panel comprising an adapted acoustically resistive layer and panel so obtained

Noise reduction sandwich panel, notably for aircraft turbojet engine

An acoustically resistive layer comprises at least one layer (,) of acoustic damping cloth and a reinforcing material comprising a sheet (,) of filaments (,) secured to the acoustically damping cloth. The filaments (,) are disposed unidirectionally, bidirectionally or multidirectionally. A process for producing such an acoustically resistive layer, comprises positioning an acoustically damping cloth (,) on a mold (,) having the shape of the layer to be obtained, and disposing on this acoustically damping cloth filaments (,) impregnated with a binder by filamentary winding, and then withdrawing the layer thus obtained from the mold, or by laying with application of pressure, and withdrawing the layer thus obtained from the mold.

Acoustically resistive layer, process for production of this layer and absorbent acoustic panel provided with at least one such layer, as well as its process for production

Growing community of inventors

Tournefeuille, France

Hervé Batard

Growing community of inventors

Tournefeuille, France

Herv&eacute; Batard

Hervé Batard