Soundproofing panel with beads, and a method of manufacture
AssigneesSnecma, Ateca
InventorsAlain Dravet, Georges Riou, Jacques Julliard, Osmin Delverdier, Philippe Vie
Life of this patent
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Abstract
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.
Claims18
A soundproofing panel comprising:
- a solid wall;
- a porous wall;
- a core positioned between said solid wall and said porous wall and connected to both said solid wall and said porous wall, said core including partitions extending between said solid wall and said porous wall and forming a plurality of cells, each cell containing a plurality of sound energy dissipating layers constituted by hollow spherical beads in mutual contact;
- and
- a first net and a second net provided with each of the plurality of sound energy dissipating layers, the first and second nets are secured to the partitions,
- wherein said hollow spherical beads have walls that are porous and micro-perforated and said hollow spherical beads are held in position by the first and second nets, and
- wherein at least two of the plurality of sound energy dissipating layers formed in a single cell vary in thickness from each other.
A method of making a soundproofing panel comprising the steps of:
- forming a core comprising partitions that form cells;
- positioning a lower net in each cell of said core;
- securing said lower nets to said partitions;
- placing on said lower net a desired thickness of hollow spherical beads having porous and micro-perforated walls;
- positioning an upper net in each cell while applying a small amount of pressure against said beads;
- securing said upper nets to said partitions;
- securing one end of the partitions forming said core to a porous wall;
- and
- securing another end of the partitions forming said core to a solid wall,
- wherein the lower and upper nets form sound energy dissipating layers,
- wherein each cell includes a plurality of sound energy dissipating layers, and
- wherein at least two of the plurality of sound energy dissipating layers formed in a single cell vary in thickness from each other.
Dependencies are inferred from the claim text.