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Mixed sound absorption structure formed by connecting porous sound absorption material and resonant sound absorption structure in parallel

A porous sound-absorbing and resonant structure technology, applied in the direction of sound-generating devices and instruments, can solve the problems of high cost of new materials, reduced sound-absorbing effect, narrow sound-absorbing frequency band, etc.

Active Publication Date: 2018-11-30
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 2) The sound absorption frequency band is narrow, and the sound absorption effect outside the peak value drops significantly
[0006] 3) Fireproof, anti-corrosion, moisture-proof lamps have poor performance and serious environmental pollution, so the application is limited by environmental conditions
[0007] 4) The problems described in 3) are not avoided, and some new materials used are of high cost and are not widely used

Method used

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  • Mixed sound absorption structure formed by connecting porous sound absorption material and resonant sound absorption structure in parallel
  • Mixed sound absorption structure formed by connecting porous sound absorption material and resonant sound absorption structure in parallel
  • Mixed sound absorption structure formed by connecting porous sound absorption material and resonant sound absorption structure in parallel

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Embodiment 1

[0031] see figure 1 , a hybrid sound-absorbing structure in which porous sound-absorbing materials and resonant structures are connected in parallel, characterized in that: the hybrid sound-absorbing structure is composed of porous sound-absorbing materials 2, resonance chambers 3 and insertion tubes 4.

[0032] The porous sound-absorbing material 2 is a hollow cylinder. The hollow cylinder has a cylindrical cavity. One end of the hollow cylinder is an open end 201 , and the other end is a circular bottom surface 202 .

[0033] The resonant cavity 3 is a hollow cylinder matching the inner cavity of the porous sound-absorbing material 2 . The porous sound-absorbing material 2 is set outside the resonant cavity 3 . One end of the resonant cavity 3 is an open end 301 that is flush with the open end 201 , and the other end is a bottom end 302 that is in contact with the bottom of the resonant cavity 3 .

[0034] The open end 201 and the open end 301 are fixed on the wall 1 . ...

Embodiment 2

[0039] see figure 2 , a hybrid sound-absorbing structure in which porous sound-absorbing materials and resonance structures are connected in parallel, is characterized in that: a hybrid sound-absorbing structure in which porous sound-absorbing materials are connected in parallel with resonance structures, is characterized in that: composed of porous sound-absorbing materials 20, several resonance The cavity 30 and several insertion tubes 40 form a hybrid sound-absorbing structure.

[0040] The porous sound-absorbing material 20 is a cuboid. One end of the cuboid is the lower end surface 2010 , and the other end is the upper end surface 2020 . The porous sound-absorbing material 20 has several cylindrical hollow cavities inside. The outlets of these hollow cavities are at the lower end surface 2010 .

[0041] The resonant cavity 30 is a hollow cylinder matching the inner cavity of the porous sound-absorbing material 20 . The number of resonant cavities 30 is the same as th...

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Abstract

The invention discloses a wideband mixed sound absorption structure formed by connecting a porous sound absorption material and a resonant sound absorption structure in parallel. The sound absorptionfrequency band of the mixed sound absorption structure is wider than that of a porous sound absorption structure, so that the mixed sound absorption structure has a better sound absorption effect; andthe position of the high-sound-absorption effect of the low frequency can be adjusted according to actual needs. The parallel mixed sound absorption structure comprises the porous sound absorption material and the resonant sound absorption structure; due to the fact that the resonant sound absorption structure is embedded in the porous sound absorption material, the whole sound absorption structure is not changed in thickness. The resonant sound absorption structure has a good sound absorption effect for the low frequency; a plurality of sound absorption peaks can be generated at the low frequency by connecting a plurality of resonant sound absorption structures with different resonant frequencies in parallel; and the whole parallel mixed sound absorption structure can not only ensure good sound absorption performance of the porous sound absorption material at the medium and high frequencies, but also have the good sound absorption effect at the low frequency.

Description

technical field [0001] The invention relates to a sound-absorbing structure, in particular to a high-efficiency sound-absorbing structure with high sound-absorbing coefficient in a wide frequency range, which is used in aviation, navigation, vehicles and buildings. Background technique [0002] With the rapid development of my country's aviation, navigation, automobiles and other means of transportation, the problem of noise pollution has become more and more obvious. At present, the measures used to reduce noise in these fields are mainly to lay sound-absorbing materials on the sound receiving surface to absorb sound wave energy. [0003] There are various existing sound-absorbing structures, but they have the following deficiencies in summary: [0004] 1) It has a specific sound-absorbing frequency range; for example, the sound-absorbing frequency range is located in the middle and high frequency bands, while the response to low-frequency sound is relatively slow; [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162G10K11/172
CPCG10K11/162G10K11/172
Inventor 贺岩松李伟张志飞徐中明
Owner CHONGQING UNIV
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