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Porous composite sound absorption structure

A sound-absorbing and sound-absorbing panel technology, which is applied in the direction of sound-generating devices and instruments, to achieve good sound-absorbing performance, widen the sound-absorbing bandwidth, and easy processing

Pending Publication Date: 2016-07-20
BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is how to widen the sound-absorbing bandwidth of the sound-absorbing structure without increasing the complexity of the sound-absorbing structure

Method used

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  • Porous composite sound absorption structure

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Embodiment Construction

[0021] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying Describes, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate in a specific orientation, and therefore sh...

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Abstract

The invention relates to the technical field of an acoustic baffle and discloses a porous composite sound absorption structure. The porous composite sound absorption structure comprises a cover plate, side plates and a base plate. The cover plate and the base plate are in opposite arrangement at an interval, and the side plates are respectively closely connected with the cover plate and the base plate to form a sound absorption back cavity; and one or more porous material layers in opposite arrangement with the cover plate is arranged in the sound absorption back cavity, when there are multiple porous material layers, an acoustic baffle or a sound absorption membrane is arranged between two adjacent porous material layers, the cover plate is provided with a plurality of micro sound absorption holes, and each porous material layer is provided with a plurality of openings at intervals. According to the invention, under the condition that the complexity of the sound absorption structure is not increased, the sound absorption bandwidth of the sound absorption structure is enlarged; and the processing is easy, the installation is convenient, and the cost is quite low.

Description

technical field [0001] The invention relates to the technical field of sound-absorbing panels, in particular to a porous composite sound-absorbing structure. Background technique [0002] The traditional perforated plate resonant absorption structure has a closed cavity behind each hole on the perforated plate, which is equivalent to many parallel "Helmholtz" resonators. When the frequency of the incident wave is consistent with the resonance frequency of the system, that is resonate. At this time, the reciprocating vibration of the air at the hole of the perforated plate reaches the maximum amplitude, and the friction and damping are also the maximum, and the sound energy is converted into heat energy due to viscous loss, that is, the sound energy dissipation reaches the maximum. This is the advantage of the perforated plate resonant absorption structure. However, this structure also has its inherent disadvantages. The main disadvantage is that the frequency selectivity i...

Claims

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Application Information

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IPC IPC(8): G10K11/168G10K11/172G10K11/162
Inventor 盖晓玲李贤徽张斌
Owner BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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