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Acoustic attenuation panel for aircraft

An aircraft and panel technology, applied in the field of aircraft, can solve the problems of adding units, shortcomings of weight and size, and increasing structures

Pending Publication Date: 2019-07-12
AIRBUS OPERATIONS (SAS)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, if the noise changes, especially if the frequency of the noise to be absorbed decreases (approximately 300Hz to 700Hz), for example due to a decrease in the rotational speed of the fan associated with an increase in its diameter, the height of the unit needs to be increased, which generates the unit structure increase in thickness
[0006] The usual solutions therefore have the disadvantage that the thickness of the structure, in particular the element material of the acoustic panels, has to be increased in order to adapt it to different noises and mainly generated eg by fans of larger diameter and reduced rotational speed lower frequency noise
Such an increase in the size of the honeycomb structure leads to disadvantages in terms of weight and size (surface area), which impairs the resistance of the acoustic panel

Method used

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  • Acoustic attenuation panel for aircraft
  • Acoustic attenuation panel for aircraft
  • Acoustic attenuation panel for aircraft

Examples

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Embodiment Construction

[0041] exist figure 1 presented schematically in and makes it possible to show that the acoustic panel 1 (or acoustically attenuating panel) of the invention is intended to make it possible to reduce (or attenuate) the noise on an aircraft (not represented), in particular a transport aircraft, by absorbing it. noise. In a preferred embodiment, this acoustic panel 1 is intended to make it possible to reduce the noise on the cabin (not represented) of the aircraft's engine.

[0042] Typically, the acoustic panel 1 includes such as figure 1 and figure 2 Presented in exploded view in:

[0043] - a panel 2 made of sound-absorbing material 3, that is to say capable of absorbing noise to attenuate it;

[0044] - a so-called resistive skin 4 which is sound-permeable, that is to say for example provided with a plurality of perforations (or holes, voids, openings) 5 passing right through said resistive skin 4, said perforations 5 being in particular Depend on figure 1 and 2 The ...

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PUM

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Abstract

An acoustic attenuation panel for an aircraft is disclosed. An acoustic panel (1) includes a plate (2) made of an acoustic absorbing material (3), as well as a resistive skin (4) and a backing skin (6) arranged respectively on both sides of the plate (2), the acoustic panel (1) including acoustic elements (8) able to carry out an acoustic absorption, each of them being arranged in a housing (7) provided in the plate (2) with an opening (9) in front of the resistive skin (4). The combination of the plate (2) and the acoustic elements (8) allows to combine the sound attenuation properties of these two types of elements and to increase the frequency range of sounds that can be attenuated by the acoustic panel (1), without increasing the dimension.

Description

technical field [0001] The invention relates to an acoustically attenuating panel for a nacelle of an aircraft, in particular for an aircraft engine. Background technique [0002] It is known that on an aircraft, for example a transport aircraft, there is generally a high level of noise generated in particular by the aircraft's engines. In order to reduce the sound effects produced by the engines of aircraft, it is known practice to provide, in particular on the nacelle of the engine, walls provided with panels exhibiting good sound absorption. [0003] In general, acoustically attenuating panels, hereinafter referred to as acoustic panels, generally comprise panels made of materials and / or structures exhibiting good sound absorption properties, in particular for the frequencies of the most objectionable noises. This attenuation is usually provided by the so-called "quarter wave" or "Helmholtz" physical phenomenon. The structure for sound absorption can thus be made of cel...

Claims

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Application Information

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IPC IPC(8): F02C7/24B64D29/00
CPCF02C7/24B64D29/00F02C7/045F05D2260/96G10K11/172Y02T50/60B64C1/40B64C2220/00G10K11/168
Inventor F.拉维斯W.布罗沙尔
Owner AIRBUS OPERATIONS (SAS)
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