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Multilayer sound-absorption wedge having resonance sound absorption structure

A technology of resonance sound absorption and sound-absorbing wedges, applied in the directions of sound-generating equipment, layered products, instruments, etc., can solve the problems of increasing building wall load, heavy sound-absorbing wedges, inconvenient transportation and installation, etc. Acoustic performance, ease of transport and installation, effect of mass reduction

Inactive Publication Date: 2012-09-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore inevitably there are the following defects: first, in order to ensure a lower cut-off frequency, the length of this type of sound-absorbing wedge is still very long, for example, it is similar to the traditional sound-absorbing wedge, when the sound-absorbing cut-off frequency is 120Hz , the total length of the sound-absorbing wedge is about 700mm; when the sound-absorbing cut-off frequency is 50Hz, the total length of the sound-absorbing wedge is as high as 1700mm, so it takes up a lot of space when installing the anechoic chamber, making effective testing The space is greatly reduced; second, because the sound-absorbing material needs to fill the entire filling space, the quality of this type of sound-absorbing wedge is generally relatively heavy, which on the one hand brings inconvenience to transportation and installation; on the other hand, increases the building wall The load of this type of sound-absorbing wedge needs to be supported by a wall with strong structural strength, which increases the cost of building an anechoic chamber; thirdly, this type of sound-absorbing wedge relies solely on increasing the length and cavity depth of the sound-absorbing wedge To improve low-frequency characteristics, the structural design is relatively simple and not flexible enough

Method used

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  • Multilayer sound-absorption wedge having resonance sound absorption structure
  • Multilayer sound-absorption wedge having resonance sound absorption structure
  • Multilayer sound-absorption wedge having resonance sound absorption structure

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Embodiment 1

[0036] like Figure 1~2 It is a schematic structural diagram provided by Embodiment 1 of the present invention, figure 1 is a stereogram, figure 2 for figure 1 Sectional view in direction A.

[0037] like figure 1 , figure 2 As shown, the present invention includes a wedge body 6 and a rigid base 5. The wedge body 6 is composed of several layers of sound-absorbing materials whose characteristic impedance gradually changes from small to large. From the top down, there are impedance matching layers 1, The sound dissipating layer 2 and the perforated plate 3 can be bonded by pressing or high-temperature fusion or environmental glue, and together constitute the tip with a multi-layer structure. Between the perforated plate 3 and the rigid base 5 there is a cavity 4 . The perforated plate 3, the cavity 4 and the rigid base 5 constitute a resonant sound-absorbing structure. The rigid base 5 and the perforated plate 3 are linked by rivets.

[0038] The specific implementati...

Embodiment 2

[0052] like Figure 4 Shown is the structural schematic diagram provided by Embodiment 2 of the present invention. The difference from the sound-absorbing wedge structure of Embodiment 1 is that two wedge bodies are provided on a rigid base, and the cavity is divided into 6 sub-cavities, according to the acoustic principle, subdividing the cavity can further broaden the sound absorption frequency band and improve the sound absorption performance.

[0053] The separator in this embodiment can be made of the same material as the perforated plate, which can be stainless steel plate, aluminum plate, alloy plate, plastic plate, wood plate, plywood, gypsum board, glass plate or cardboard, etc., and its plate thickness can be installed according to the actual situation. It is determined that it is about 1-5mm; it is further explained that the number of sub-cavities is not limited in Embodiment 2 of the present invention.

Embodiment 3

[0055] like Figure 5 Shown is the structural schematic diagram provided by Embodiment 3 of the present invention. The difference from the sound-absorbing wedge structure of Embodiment 1 is that there are two wedge structures on a rigid base, and the cavity is filled with honeycomb interlayer. According to the acoustic According to the principle, filling the honeycomb interlayer can also further improve the sound absorption performance. The honeycomb interlayer in this embodiment can use aluminum alloy honeycomb layer, glass fiber reinforced plastic honeycomb layer or paper honeycomb layer and the like.

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Abstract

The invention discloses a multilayer sound-absorption wedge having a resonance sound absorption structure. The multilayer sound-absorption wedge comprises a wedge body and a rigid base, wherein the wedge body is in a three-layer sound absorption structure and comprises sequentially an impedance matching layer, a sound dissipation layer and a hole penetrating plate from top to bottom, a hollow cavity is formed between the hole penetrating plate and the rigid base, and the hole penetrating plate, the hollow cavity and the rigid base form the resonance sound absorption structure. The multilayer sound-absorption wedge having the resonance sound absorption structure combines two impedance gradual changing principals that the sectional area of the wedge changes from being small to being large, and the characteristic impedance of a multilayer sound absorption structure of a multilayer sound-absorption material changes from being small to being large gradually, so that the limit that the total length of the sound absorption wedge is a quarter of the cut-off frequency wedge wavelength is broken through, low cut-off frequency is guaranteed, simultaneously, length, space volume and quality of the sound absorption wedge are reduced remarkably and the cost of construction of an anechoic chamber is saved, besides, the sound-absorption wedge is provided with the resonance sound absorption structure, the low-frequency characteristic of the sound-absorption wedge is improved remarkably, the sound-absorption wedge can be designed in accordance with different sound source characteristics, and the flexibility of design is improved.

Description

technical field [0001] The invention relates to a sound-absorbing wedge, in particular to a sound-absorbing wedge which has a resonant sound-absorbing structure and is composed of multi-layer sound-absorbing materials according to the principle that the characteristic impedance gradually changes from small to large. Background technique [0002] The anechoic chamber is a professional laboratory used in acoustic experiments. It can measure noise and acoustic characteristics of products. It has a wide range of applications in the fields of automobiles, aerospace, household appliances, computers and communications, and industrial products. When measuring the acoustic wave characteristics, the anechoic chamber needs to establish a free sound field space, that is, in this space, the medium that propagates the sound wave extends infinitely in all directions uniformly, so that the sound energy radiated by the sound source can propagate "freely", that is, there is no There is no ref...

Claims

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Application Information

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IPC IPC(8): G10K11/172G10K11/168B32B3/12
Inventor 王焕钦段秀华钱玉洁孙文娟高理升孔德义尤晖
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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