Ateca

Snecma

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

Hispano Suiza Aerostructures

Jacques Michel Julliard

Osmin Regis Delverdier

Philippe Jean Vie

Georges Jean Riou

Patrick Gonidec

Eric Lecossais

Olivier Michael Molinari

Alain Dravet

Marius Goutines

Pierre Loheac

Jean-Michel Nogues

Bernard Louis Le Barazer

Frederic Raymond Miroudot

Stephane Thomas

Benjamin Andre Poirier

A soundproofing panel having a core sandwiched between a solid wall and a porous wall. The core being connected to the walls and having partitions extending in the thickness direction between the two walls so as to form cells. Each cell containing at least one sound energy dissipating layer constituted by hollow spherical beads having mutually contacting walls that are porous and micro-perforated, and being held in position in the thickness direction between the two walls by nets that are secured to the partitions.

Soundproofing panel with beads, and a method of manufacture

A soundproofing panel comprises a honeycomb core sandwiched between a solid skin and a porous skin, the cells of the honeycomb being divided in the direction of its thickness into at least two resonant cavities by a least one partition which is traversed by passages interlinking the cavities. The partitions are formed by a plurality of hollow microbeads having porous walls, the microbeads being bonded to one another and to the walls of the honeycomb at their points of contact. Such a soundproofing panel combines high performance in terms of linearity as a function of the level of sound excitation, attenuation band, bulk and mechanical strength.

Soundproofing panel and method of producing said panel

Growing community of inventors

Hericy, France

Jacques Michel Julliard