Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Jean-Paul Bernard

Louis Francois Jumelle

Pierre Jules Brussieux

Jean Lucien Simonin

A composite material with acoustic absorption properties of the 'sandwich' ype has a core of cellular structure between two skins substantially parallel one of which is cut-out by orifices while the other is devoid of orifices. The core is composed of a plurality of cells each of which extends from one skin to the other. A plurality of small plates, of material with high acoustic resistivity, are inserted into the cellular structure. Each plate has an active part contained in a plane substantially parallel to the skins, so that the active parts form, together, the equivalent of an intermediary wall of high acoustic resistivity dividing the cellular structure into two superposed layers each formed by a mass of sub-cells.

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Dammarie-les-Lys, France

Jean-Paul Bernard