ASSEMBLY CONSTITUTING AN ACOUSTIC ABSORBENT MATERIAL

The novel assembly with varying intermediate plates and tubes in a honeycomb structure addresses the limitation of existing materials by broadening the frequency attenuation range, enhancing noise reduction in aircraft engines.

FR3166742A1Pending Publication Date: 2026-03-27AIRBUS OPERATIONS (SAS)
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Patent Information

Application Number
FR2024010196
Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-24
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing acoustically absorbing materials in aircraft engines fail to effectively attenuate a wide range of acoustic frequencies, limiting their noise reduction capabilities.

Method used

A novel assembly comprising a first and second plate with a honeycomb structure between them, featuring multiple intermediate plates of varying distances and tubes, forming quarter-wave and Helmholtz resonators to broaden the attenuation spectrum.

Benefits of technology

The assembly achieves enhanced noise reduction by attenuating multiple acoustic frequencies, improving the overall noise attenuation performance.

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Abstract

ASSEMBLY CONSTITUTING AN ACOUSTIC ABSORBENT MATERIAL The invention relates to an assembly (100) constituting an acoustically absorbing material and comprising a first plate (102) perforated with holes (106), a second plate (104), between the first plate (102) and the second plate (104), a honeycomb structure (112) which has four cages (120), and for each cage (120), an intermediate plate (110) is fixed in said cage (120) between the first plate (102) and the second plate (104), wherein each intermediate plate (110) is traversed by at least one through hole (132) and wherein the distance between the first plate (102) and the intermediate plate (110) is different for each cage (120) of the honeycomb structure (112). Such an assembly makes it possible to obtain broadband attenuation. Fig. 1
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