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Composite sound absorption plate

A sound-absorbing panel and sound-absorbing technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of poor processing technology and the failure to maximize the expansion of the sound-absorbing characteristics of micro-perforated panels, so as to achieve controllable production costs, Significant sound-absorbing effect and effect-enhancing 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 plate
  • Composite sound absorption plate
  • Composite sound absorption plate

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 panel described in this embodiment, figure 2 for figure 1 The A-A section diagram.

[0031] The composite sound-absorbing panel is composed of a micro-perforated plate 1 and a matrix 2 that are attached together. 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 shape. Such as figure 2 As shown, the substrate 2 is provided with a plurality of sound-absorbing cavities 21 , and a communication channel 22 is provided between two adjacent sound-absorbing cavities 21 .

[0032] During the working process, sound waves pass through the sound-absorbing hole 11 , the sound-absorbing cavity 21 and the communication channel 22 be...

Embodiment 2

[0040] See image 3 , which shows a cross-sectional view of the composite sound-absorbing panel 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.

[0041] 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.

[0042] In summary, the present invention has the following advantages:

[0043] (1) The composite sound-a...

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Abstract

The invention relates to the sound absorption technical field, particularly to a composite sound absorption plate. The composite sound absorption plate comprises a micro perforation plate and a base body which are arranged in an attached mode; the micro perforation plate is provided with a plurality of through sound absorption holes; the 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 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 base body. 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, the energy consumption effect is achieved through the resonance sound absorption principle of the micro perforation plate and the sound absorption empty chambers, and accordingly the sound absorption effect of the structure can be particularly significant and meanwhile the sound absorption structure is located on the base body and the micro perforation plate and accordingly the separated independent machining can be performed, 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-absorbing panel. 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, and th...

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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