Broadband sound absorbing material and sound absorbing device

A technology of sound-absorbing device and sound-absorbing material, which is applied to shaft equipment, shaft lining, tunnel lining, etc., can solve problems such as the inability to meet the multiple requirements of sound-absorbing materials for expressway tunnels, the sound absorption coefficient is not high enough, and the manufacturing process is complicated. , to achieve the effect of increasing the effective area of ​​sound absorption, increasing the sound absorption coefficient, and broadening the sound absorption frequency band

Active Publication Date: 2014-08-20
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently developed sound-absorbing materials are either due to insufficient sound absorption coefficient in the low-to-medium frequency range, or because of complex manufacturing processes and high costs, or because of poor flame retardancy, or because they are not suitable for the humid environment in the tunnel. None of them can meet the multiple requirements of sound-absorbing materials for expressway tunnels

Method used

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  • Broadband sound absorbing material and sound absorbing device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the broadband sound-absorbing material of the present invention includes an activated carbon fiber three-dimensional fabric layer 2 and a porous material layer 3; the activated carbon fiber three-dimensional fabric layer 2 is two layers, and the outer surface of each layer of activated carbon fiber three-dimensional fabric layer 2 is coated with nanofibers Film 1. The porous material layer 3 is arranged between the two activated carbon fiber three-dimensional fabric layers 2 . The porous material layer 3 adopts aluminum foam.

[0020] The thickness of the nanofiber membrane 1 is 10 μm, the thickness of the activated carbon fiber three-dimensional fabric layer 2 is 1 mm, and the thickness of the porous material layer 2 is 1 mm.

[0021] The sound-absorbing device of the present invention adopts the above-mentioned sound-absorbing material, including the connecting piece 5 . The connecting piece 5 is integrally formed by a steel plate, the fr...

Embodiment 2

[0024] The material and structure of each layer of the broadband sound-absorbing material of the present invention are the same as those in Embodiment 1. Wherein, the thickness of the nanofiber membrane 1 is 100 μm, the thickness of the activated carbon fiber three-dimensional fabric layer 2 is 4 mm, and the thickness of the porous material layer 2 is 6 mm.

[0025] The structure of the sound-absorbing device of the present invention is the same as that of Embodiment 1. Wherein the depth of the cavity 6 is 40 mm.

[0026] The sound absorption device is tested, and the average sound absorption coefficient in the 80-6300 Hz frequency band is 0.82, and the maximum value is 0.98.

Embodiment 3

[0028] The material and structure of each layer of the broadband sound-absorbing material of the present invention are the same as those in Embodiment 1. Wherein, the thickness of the nanofiber membrane 1 is 1000 μm, the thickness of the activated carbon fiber three-dimensional fabric layer 2 is 10 mm, and the thickness of the porous material layer 2 is 10 mm.

[0029] The structure of the sound-absorbing device of the present invention is the same as that of Embodiment 1. The depth of the cavity 6 is 100 mm.

[0030] The sound absorption device is tested, and the average sound absorption coefficient in the 80-6300 Hz frequency band is 0.70, and the maximum value is 0.97.

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Abstract

The invention discloses a broadband sound absorbing material and a sound absorbing device. The sound absorbing material comprises active carbon fiber three-dimensional fabric layers and a porous material layer, wherein at least two active carbon fiber three-dimensional fabric layers are formed; the porous material layer is formed between the two active carbon fiber three-dimensional fabric layers; the outer surface of each active carbon fiber three-dimensional fabric layer is coated with a nanometer fiber film; and the porous material layer is made of foamed aluminum or a cement-based porous composite material. According to the sound absorbing device, the sound absorbing material is fixedly arranged on a wall body through a connecting piece, the front end of the connecting piece is provided with a connecting device for fixing the broadband sound absorbing material, and the back end of the connecting piece is a cavity. The sound absorbing device disclosed by the invention can effectively meet the use requirements of expressway tunnels.

Description

technical field [0001] The invention relates to a sound-absorbing material and a sound-absorbing device, in particular to a high-efficiency sound-absorbing material with a relatively large sound-absorbing coefficient in a wide-frequency range for highway tunnels and a sound-absorbing device using the material. Background technique [0002] With the deepening of my country's western development, the construction of expressways has entered an unprecedented stage of rapid development. Most of the high-grade highways under construction and planning in recent years are distributed in the mountains and mountains. In order to achieve the indicators of speed and safety, a large number of expressway tunnels have appeared. In recent years, with the rapid development of highway traffic construction, there are more and more expressway tunnels (especially super-long tunnels), and the environmental problem of traffic noise pollution is particularly prominent. At present, most of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/38
Inventor 高强刘其霞季涛余进
Owner NANTONG UNIVERSITY
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