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Broadband acoustic metamaterial

An acoustic metamaterial and broadband technology, applied in the field of acoustic metamaterials, can solve problems such as narrow sound insulation bandwidth, achieve the effect of expanding the application range and increasing the effective sound insulation bandwidth

Active Publication Date: 2019-08-06
HAIER SMART HOME CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a broadband acoustic metamaterial to solve the problem of narrow effective sound insulation bandwidth of existing acoustic metamaterials and improve its sound insulation and noise reduction effect

Method used

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Embodiment Construction

[0032] figure 1 is a partial plan view of existing acoustic metamaterials, figure 2 yes figure 1 The graph of the sound insulation of the acoustic metamaterial is shown.

[0033] figure 1 What is shown is only a part of the acoustic metamaterial, and the actual material can be extended to all directions based on this. Existing acoustic metamaterials basically include three parts, namely a grid plate 100 , an elastic membrane 200 and a mass block 300 . figure 1 Among them, the grid plate 100 is located behind the elastic film 200 and is used to tension the elastic film 200, so it is indicated by a dotted line in the figure. The grid plate 100 is composed of a plurality of horizontal grid bars and a plurality of vertical grid bars to form a plurality of small grid units, which are called sound insulation units 10 .

[0034] figure 2 yes figure 1 The graph of the sound insulation of the acoustic metamaterial is shown. image 3 signaled figure 1 The first-order overall ...

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Abstract

The invention provides a broadband acoustic metamaterial. The broadband acoustic metamaterial comprises: a grating plate with a plurality of hollow parts; an elastic film which is tensioned and fixedon the grating plate, wherein the first surface of the elastic film is attached to the grating plate; a plurality of mass blocks fixed on the second surface of the elastic film, each mass block facingone hollow part of the grating plate. The periphery of each mass block is surrounded by multiple rigidity control blocks, and each rigidity control block is fixed to the second surface of the elasticfilm. The problem that an effective sound insulation band of an existing acoustic metamaterial is narrow is solved, and the sound insulation and noise reduction effects of the acoustic metamaterial are improved.

Description

technical field [0001] The invention relates to the technical field of acoustic metamaterials, in particular to a broadband acoustic metamaterial. Background technique [0002] As a new type of sound insulation material, acoustic metamaterials are based on the principle of local resonance, that is, when sound waves in the design frequency band are incident on the acoustic metamaterial, it will excite the deformation of the acoustic metamaterial and generate local resonance. About half of the acoustic metamaterial produces vibration deformation in the same direction as the sound wave, and the other half produces vibration deformation in the opposite direction to the sound wave. Therefore, the phenomenon of interference cancellation through the positive and negative superposition of the far-field sound waves generated by the acoustic metamaterial is realized. Sound insulation effect. Acoustic metamaterials break through the limitation of low-frequency sound insulation of trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 范强朱小兵陈建全闫茂松马刚张运坤
Owner HAIER SMART HOME CO LTD
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