Apparatus and method for aircraft cabin noise attenuation via non-obstructive particle damping

a technology of aircraft cabin and damping, applied in the field of noise reduction apparati, can solve problems such as energy dissipation, and achieve the effect of high damping, durable and reliabl

Inactive Publication Date: 2005-09-08
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] One advantageous aspect of NOPD is that a high level of damping may be is achieved by actually absorbing the energy of the structure, as opposed to the more traditional methods of damping wherein elastic strain energy stored in the structure is converted to heat. Thus, with a proper choice of particle size, including density and material, NOPD provides a very durable and reliable technique of structural vibration and noise energy attenuation that is essentially independent of temperature.

Problems solved by technology

Thus, energy dissipation occurs due to both frictional losses (i.e., when the particles either rub against each other or against the structure) and inelastic particle-to-particle collisions.

Method used

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Embodiment Construction

[0019] The materials an aircraft manufacturer may use during construction are subject to various design parameters. For example, in addition to desiring that the various structural materials used in the aircraft possess a high degree of strength, such materials also need a low degree of flexibility and a relatively low mass. To successfully optimize these design parameters, manufacturers have come to utilize structural elements commonly referred to as “honeycombs” or “honeycomb structures.” For purposes of the present invention described herein, “honeycomb structures” are structural units (i.e., walls, floors, ceilings, etc) of an aircraft comprising a substantially hollow middle portion, generally formed of hexagonal (or other similar shape) rows of hollow cells or cavities, resembling the structure of a honeycomb in a beehive.

[0020] One advantage of honeycomb structures is that they can be made of types of materials both preferred and desired by aircraft manufacturers, while prov...

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PUM

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Abstract

An apparatus for reducing noise in an aircraft cabin is disclosed. The apparatus comprises a structure portion and filler material. The structure portion further comprises an internal member having at least one cavity disposed therein. Each of the at least one cavity of the structure portion are filled with the filler material.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to noise reduction apparati and methods and, more particularly, to an apparatus and method for aircraft cabin noise attenuation via Non-Obstructive Particle Damping. BACKGROUND OF THE INVENTION [0002] Currently, viscoelastic, or rubber-like, materials are frequently used in the construction of floor panels and other structural elements in aircraft for both structural vibration and noise energy attenuation, as well as in other vehicles or structures where so desired. Normally, when used, these materials come in the form of an adhesive, such as a tape, that is adhered to the surface of the floor panel (or other structural element); this adhesive then acts as a structural vibration and noise energy absorbing medium. Thus, structural vibration and noise energy is absorbed via the flexure (i.e., bending) of the viscoelastic materials; this dissipates the mechanical (vibration) energy by converting it into heat. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04B1/82
CPCB32B3/12B32B3/266B32B2250/40G10K11/172B32B2307/102B32B2605/18B64C1/40B32B2264/104
Inventor PANOSSIAN, HAGOP
Owner THE BOEING CO
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