Acoustic liners with low-frequency sound wave attenuating features
An acoustic and intermediate frequency technology, which is applied in the direction of sound-generating equipment, control of wind turbines, and wind turbines that are consistent with the wind direction, and can solve problems such as the depth of the resonance unit and the corresponding attenuation of low-frequency sound waves
Pending Publication Date: 2022-01-25
GENERAL ELECTRIC CO
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However, the space available on wind turbine blades is also constrained, which in turn constrains the depth of the resonant unit and the corresponding attenuation of low frequency sound waves
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[0079] Reference will now be made in detail to exemplary embodiments of the presently disclosed subject matter, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of illustration and should not be construed as limiting the present disclosure. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the scope of the disclosure. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present disclosure cover such modifications and variations as come within the scope of the appended claims and their equivalents.
[0080]Acoustic pads for damping or attenuating sound waves, and methods of forming such acoustic pads, are described herein. Acoustic liners may, for example, be used to dampen or attenuate no...
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An acoustic core includes an array of resonant cells. The array may include a plurality of coupled resonant cells respectively defining an antecedent resonant space and a subsequent resonant space, with at least one cell wall having one or more wall-apertures defining a pathway between the antecedent resonant space and the subsequent resonant space. The array may include a plurality of high-frequency resonant cells respectively defining a high-frequency resonant space and being matched with respective ones of the plurality of coupled resonant cells. A cross-sectional dimension of the one or more wall-apertures defining the pathway between the antecedent resonant space and the subsequent resonant space may be less than a cross-sectional dimension of the antecedent resonant space and / or a cross-sectional dimension of the subsequent resonant space. The array may include a plurality of partitioned resonant cells that have a partition integrally formed with at least one of a corresponding one or more cell walls and transecting the corresponding resonant space with at least one surface of the partition having an interface angle that is oblique or perpendicular relative to a plane parallel to a top face and / or a bottom face of the array of resonant cells.
Description
[0001] Federally Funded Research [0002] This invention was made with Government support under Contract No. DTFAWA-15-A-80013 awarded by the U.S. Department of Transportation's Federal Aviation Administration (FAA). The government has certain rights in this invention. technical field [0003] The present disclosure relates to acoustic cores for attenuating noise, such as from a turbine. Background technique [0004] Acoustic pads can be used to dampen or attenuate sound waves. For example, acoustic liners are used to dampen or attenuate noise from turbines, such as turbofan engines, as well as noise from other devices, such as wind turbine blades. [0005] An exemplary acoustic liner includes an acoustic core positioned between a perforated or otherwise porous acoustic screen and a substantially non-porous backplate. An acoustic screen may be coupled to an acoustic core comprising a plurality of resonant cells. A perforated or otherwise porous acoustic screen allows sou...
Claims
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IPC IPC(8): F03D1/06F03D7/02F02C7/00F02C7/045
CPCF03D1/0633F03D1/0675F03D7/0296F02C7/045F02C7/00F05D2250/283F03D80/00F05B2250/283F05B2260/96F02K1/827F05D2250/282G10K11/172B32B3/12B32B2307/102B32B5/028B32B2605/18Y02E10/72Y02T50/60
Inventor T·H·伍德N·N·帕斯托琴科K·拉马克里什南T·R·德普伊林玟玲R·W·戴维多夫
Owner GENERAL ELECTRIC CO