SOUND-ABSORBING PANEL FOR EJECTOR NOZZLE Russian patent published in 2014 - IPC G10K11/168 

FIELD: physics, acoustics.

SUBSTANCE: group of inventions relates to acoustics and aviation engineering and is intended for use as a sound-absorbing panel. The sound-absorbing panel for an ejector nozzle has an external skin containing sound-absorbing holes, an internal skin, a sound-absorbing structure having a cellular core situated between the internal skin and the external skin. At least one main component selected from the external skin, the internal skin and the sound-absorbing structure is formed by a composite material and the sound-absorbing structure is in contact with at least one of the internal skin and the external skin by compression using elastic means. At least part of the elastic means includes at least one fibrous element which completes the sound-absorbing structure and is able to compress in thickness, wherein the fibrous element is made of material selected from heat-resistant graphite and carbon felts integrating porosity of the felt, tortuosity of the fibres, aspect ratio, average size of the fibres and/or an entanglement rate, dampers which are a continuation of the wall of at least part of the elements with a cellular core of the sound-absorbing structure, or a coil spring able to apply pressure on the sound-absorbing structure such that said structure is in contact with the external skin. The sound-absorbing panel is part of the ejector nozzle and the body.

EFFECT: high strength of the structure.

9 cl, 9 dwg