Porous sound-insulating structure

A structural and porous technology, applied in the direction of sound insulation, insulation layer, building components, etc., can solve the problems of unexpected low-frequency sound insulation effect, large amount of materials, low sound absorption rate, etc.

Active Publication Date: 2005-02-02
KOBE STEEL LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when glass wool is used, the sound absorption rate in the low frequency band (here 0-30Hz, especially 0-20Hz) is relatively low (see Figure 9 (b)), the sound insulation effect on low-frequency sounds cannot be...

Method used

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Embodiment Construction

[0056] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0057] figure 1 It is a cross-sectional view showing a state in which an outer member and an inner porous plate are arranged to face each other in a porous sound-insulating structure according to an embodiment of the present invention. Such as figure 1 As shown, the porous sound-insulating structure 10 of the present embodiment is composed of an outer member 1 and an inner member 2 disposed substantially parallel to each other with an air layer 3 interposed therebetween.

[0058] Both the outer member 1 and the inner member 2 may be made of metal such as iron or aluminum, resin, cement, and other various materials. In addition, it is preferable that the outer member 1 and the inner member 2 are made of the same material so that they do not need to be handled separately at the time of recycling.

[0059] The inner member 2 disposed on the sound source side...

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Abstract

The invention provides a porous sound-insulation structural body, comprising an outer side element and an inner side element arranged opposite to each other, wherein, the inner side element is provided with a plurality of through holes, and the thickness of the inner side element, the diameter Phi of the through holes and the numerical aperture are set to generate viscous-damping effect on the air in the through holes when the sound frequency is lower than 30 Hz. The invention is characterized in that the outer side element and the inner side element are arranged opposite to each other through an air layer; the inner side element can be in various shapes, more than two shapes or a combination of multiple shapes; the length of the inner side element part forming the through holes is preferably shorter than 1/2 of the sound wavelength of the sound insulation object and the thickness of the air layer is preferably shorter than 1/2 of the sound wavelength or in integral multiples of the half-wave of the sound insulation object. The porous sound-insulation structural body has the advantages of performing high sound insulation effect at relatively broad frequency band for low-frequency sound.

Description

technical field [0001] The present invention relates to a porous sound-insulating structure capable of reducing sound from a noise source, and more particularly to a porous sound-insulating structure capable of responding to low-frequency sounds below 30 Hz. Background technique [0002] In recent years, with the help of an air layer, with respect to the sound source, on the outside and inside of the sound source, a board without holes and a board with a plurality of through holes formed on the entire board are respectively arranged to face each other, and it has been applied in various fields. This is a porous sound-insulating structure that insulates sound. When using the Helmholtz principle, for example, based on the general formula: "f=(c / 2π)×{β / (t+1.6Φ)d}" (f: resonance frequency, c: speed of sound, β: Numerical aperture, t: thickness of inner plate, Φ: diameter of through hole, d: thickness of air layer) can efficiently reduce noise at a specific resonance frequency ...

Claims

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Application Information

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IPC IPC(8): E04B1/82
Inventor 山极伊知郎田中俊光
Owner KOBE STEEL LTD
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