Sound absorbing structure

A technology of structural body and frame body, applied in the direction of sound-producing equipment, instruments, etc., can solve the problem of narrow sound-absorbing band, and achieve the effect of improving sound-absorbing efficiency

Inactive Publication Date: 2011-05-04
KOBE STEEL LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] In the sound-absorbing structure of Patent Document 1 mentioned above, although the reduction in sound-absorbing performance caused by the resonance phenomenon in the air layer can be surely suppressed, since there is only one air layer communicating with the through-holes of the perforated plate, only one air layer communicating with the through-hole of the porous plate can be eliminated. The surrounding sound of a resonant frequency corresponding to the air layer, the sound absorption band is very narrow

Method used

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Embodiment

[0201] Next, specific examples of the present invention will be described.

[0202] As an example, make Figure 17A as well as Figure 17B The sound absorbing structure 801 is shown. The sound-absorbing structure 801 of the embodiment includes six perforated plate units 803 , and the six perforated plate units 803 are arranged along the longitudinal direction inside the frame body 802 . As the porous plate unit 803, a porous plate unit having the same structure as the porous plate unit 3 of the first embodiment is used. In the sound-absorbing structure 801 of the embodiment, the respective plate thicknesses, aperture ratios, and diameters of the through holes of the surface plate 802a, the planar portions 804a, 805a, and the side portions 804b, 805b, and the sizes of the air chambers 806-808 and the gaps D1, d1 are as follows: Table 1 shows.

[0203] 【Table 1】

[0204]

[0205] As a comparative example, make Figure 18A as well as Figure 18B An existing attraction st...

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Abstract

A sound absorbing structure having a wide sound absorbing frequency range and high sound absorbing efficiency. A sound absorbing structure (1) is provided with a housing (2) having on one surface thereof a surface plate (2a) constructed from a porous plate, and also with porous plate units (3) which are each constructed from porous plates and are mounted in the housing (2). The porous plate units (3) are arranged side by side in the direction of the surface of the surface plate (2a). The porous plate units (3) each composed of two flat surface sections (3a, 4a) facing the surface plate (2a), and of side surface sections (3b, 4b) respectively connected to the flat surface sections (3a, 4a) and extending in a direction crossing the surface plate (2a). The space in the housing (2) is partitioned by the flat surface sections (3a, 4a) into spaces arranged side by side in a depth direction perpendicular to the surface plate (2a) and is partitioned by side surface sections (3b, 4b) into spaces arranged side by side in the direction of the surface of the surface plate (2a).

Description

technical field [0001] The present invention relates to a sound-absorbing structure using a porous plate. Background technique [0002] Conventionally, there is known a sound-absorbing structure that absorbs sound by utilizing the principle of a Helmholtz resonator by arranging a porous plate formed with a plurality of through holes and a rigid wall formed with no holes through an air layer. In such a sound-absorbing structure, when the surrounding sound of a specific frequency (resonance frequency) corresponding to the diameter of the through-hole or the volume of the air layer enters the air layer from the through-hole, resonance occurs, and the air passing through the through-hole portion The vibration produces friction between the inner wall of the through hole and the air, and part of the vibration energy is converted into heat energy, resulting in sound absorption. In addition, the resonant frequency becomes a lower frequency as the volume of the air layer increases. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 山极伊知郎山田隆博堀尾正治田岛武中原利恭
Owner KOBE STEEL LTD
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