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Composite sound absorption structure

A sound-absorbing and sound-absorbing board technology, which is applied in the direction of sound-producing equipment and instruments, can solve the problems of poor processing technology and the sound-absorbing characteristics of micro-perforated boards cannot be expanded to the maximum extent, so as to achieve controllable production costs, The sound absorption effect is remarkable and the effect of improving the effect

Inactive Publication Date: 2015-05-13
BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the constraints of practical application methods, the sound absorption characteristics of micro-perforated panels have not been able to expand to the maximum extent, and the processing technology is not good.

Method used

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  • Composite sound absorption structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] See figure 1 and figure 2 ,in, figure 1 It is a top view of the composite sound-absorbing structure described in this embodiment, figure 2 for figure 1 The A-A section diagram.

[0031] The composite sound-absorbing structure is composed of a sound-absorbing panel and a structural matrix 3 compositely connected with a resonant cavity 31 between them. The sound-absorbing panel is composed of a micro-perforated plate 1 and a plate base 2 that are attached together, and the cavity 31 is formed between the structural base 3 and the plate base 2 . Such as figure 1 As shown, the micro-perforated plate 1 is provided with a plurality of through sound-absorbing holes 11; here, the sound-absorbing holes 21 on the micro-perforated plate 1 are circular, in fact, the micro-perforated plate 1 can also be designed as a rectangle, Hexagonal, oval or irregular shapes. Such as figure 2 As shown, the panel base 2 is provided with a plurality of sound-absorbing cavities 21 , and...

Embodiment 2

[0041] See image 3 , which shows a cross-sectional view of the composite sound-absorbing structure described in the second embodiment, and its cutting position is the same as figure 2 The cutting position is the same. In addition, it should be noted that the same functional components in the figure are shown with the same symbols, so as to clearly show the differences and connections between the two embodiments.

[0042] The difference between this solution and the first embodiment is that the cross-sectional profile of the sound-absorbing cavity in the first embodiment is a parabolic shape with an upward opening; while in this solution, the cross-sectional profile of the sound-absorbing cavity 21a is a conical shape with an upward opening. The composition and connection relationship are the same as those of the first embodiment, so this embodiment will not repeat them.

[0043] In summary, the present invention has the following advantages:

[0044] (1) The composite sou...

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Abstract

The invention relates to the sound absorption technical field, particularly to a composite sound absorption structure. A sound absorption plate of the composite sound absorption structure comprises a micro perforation plate and a plate base body; the micro perforation plate is provided with a plurality of through sound absorption holes; the plate base body is provided with a plurality of sound absorption empty chambers; a communication channel is formed between every two adjacent sound absorption empty chambers; the surface of the plate base body, which is provided with the sound absorption empty chambers, is attached to the micro perforation plate; every sound absorption hole formed in the micro perforation plate is communicated with the corresponding sound absorption empty chamber formed in the plate base body; an empty chamber is formed between a structural base body of the composite sound absorption structure and the plate base body of the sound absorption plate. Compared with the prior art, the micro perforation plate, the sound absorption empty chambers and the communication channel formed between every two adjacent sound absorption empty chambers can effectively participate in energy consumption and sound absorption, meanwhile the resonance effect is achieved through the empty chamber formed between the composite sound absorption plate and the structural base body, and accordingly the sound absorption effect of the composite sound absorption structure can be particularly significant and meanwhile the sound absorption structure can be separately and independently machined, the manufacturability is good, and the production cost can be controlled.

Description

technical field [0001] The invention relates to the technical field of sound absorption, in particular to a composite sound absorption structure. Background technique [0002] In noise control engineering, 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 resonant sound-absorbing structure of the micro-perforated plate can be understood For a parallel connection of many Helmholtz resonators. When the sound wave enters the small hole, it excites the air in the cavity to vibrate. If the frequency of the sound wave 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 reciprocates, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/172
Inventor 赵俊娟李贤徽张斌王月月
Owner BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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