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Controllable sound absorption structure

A sound-absorbing and sound-absorbing hole technology, which is applied in the direction of sound-emitting devices and instruments, can solve problems such as narrow frequency band, inability to effectively deal with noise environments, and fixed effective sound-absorbing center frequency, so as to achieve low production costs and expand effective sound-absorbing Frequency band, the effect that the sound absorption effect is remarkable

Inactive Publication Date: 2015-04-29
BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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AI Technical Summary

Problems solved by technology

However, the existing traditional micro-perforated plate resonant sound-absorbing structure has a fixed effective sound-absorbing center frequency and a narrow frequency band, which determines that it cannot effectively deal with the above-mentioned complex noise environment.

Method used

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Embodiment Construction

[0024] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0025] See figure 1 with figure 2 ,among them, figure 1 This is a schematic diagram of the overall structure of the controllable sound-absorbing structure of this embodiment, figure 2 for figure 1 Top view of the piezoelectric film shown in.

[0026] The controllable sound-absorbing structure uses a piezoelectric film 1 as a micro-perforated plate, on which a plurality of through sound-absorbing holes 3 are provided. The piezoelectric film 1 is fixed on both sides of the base 1 with a cavity between the two to form a micro-perforated plate structure. When the sound wave enters the small hole, it will excite the air in the cavity to vibrate. When the sound wave frequency is the same as the resonance frequency ...

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Abstract

The invention relates to the technical field of sound absorption, in particular relates to a controllable sound absorption structure. The controllable sound absorption structure comprises a base body and a piezoelectric film fixedly arranged on the base body, wherein a cavity is formed between the base body and the piezoelectric film; a plurality of penetrating sound absorption holes are formed in the piezoelectric film; a noise frequency collection element is used for acquiring the frequency of environmental noise; a voltage modulation circuit is electrically connected with the piezoelectric film through a lead wire; the signal receiving port of the voltage modulation circuit is connected with the signal output port of a noise frequency collection element so as to apply excitation voltage to the piezoelectric film. Compared with the prior art, the controllable sound absorption structure has the advantages that in the working process, the voltage modulation circuit can apply an excitation electric field to the piezoelectric film, so that the apertures of the sound absorption holes in the piezoelectric film are correspondingly changed, and the controllable active sound absorption performance of the sound absorption structure to noise with different frequencies is realized; therefore, the effective sound absorption frequency band of the sound absorption structure is expanded. Compared with the prior art, the controllable sound absorption structure has the characteristics of high easiness in structural processing, low production cost and outstanding sound absorption effect.

Description

Technical field [0001] The present invention relates to the technical field of sound absorption, in particular to a controllable sound absorption structure. Background technique [0002] In noise control engineering, the micro-perforated plate resonance structure is a widely used sound absorption technology. As we all know, the sound absorption mechanism of the micro-perforated plate resonant sound-absorbing structure is that the system composed of each perforation on the micro-perforated plate and its corresponding air layer is similar to a Helmholtz resonator, and the micro-perforated plate resonance sound absorption structure can be understood It is the parallel connection of many Helmholtz resonators. When the sound wave enters the small hole, it will excite the air in the cavity to vibrate. If the sound wave frequency is the same as the resonance frequency of the structure, the air in the cavity will resonate, and the air column at the neck of the perforated plate will vibr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16
Inventor 赵俊娟李贤徽张斌王月月
Owner BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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