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A tunnel cellular noise reduction screen

A honeycomb and noise reduction technology, which is applied in noise absorption devices, buildings, analysis of solids using sonic/ultrasonic/infrasonic waves, etc. It can solve the problems of inability to reduce noise and increase the amount of channel noise, and achieve high absorption rate and bubble distribution. Uniform, high absorption effect

Active Publication Date: 2022-07-29
山西省交通环境保护中心站(有限公司)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, with the increase of traffic flow in highway tunnels and the speed up of locomotives in railway and subway tunnels, the noise level in the cavity has been increasing rapidly. Relying solely on car body materials can no longer completely reduce the noise to the level acceptable to the human ear. amount of noise

Method used

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  • A tunnel cellular noise reduction screen
  • A tunnel cellular noise reduction screen
  • A tunnel cellular noise reduction screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] make 1m 2 The sealing bottom plate is flat, the height of the flute is 6cm, and the height is 6cm, and the length is 3cm. The regular hexagonal plane honeycomb with the same height, the bottom sealing plate is made of 5 layers of carbon fiber cloth, and the honeycomb cylinder is made of two layers, which are assembled into a honeycomb. The sound-absorbing material is rock wool with a thickness of about 0.7cm as the base, and the porous foamed rubber with a thickness of about 0.5cm is adhered (without any filler), the opening rate is 50%, the transition layer is about 0.5cm, and the diameter of the through hole is 0.3cm , through hole density 2 / cm 2 . The average vertical incidence sound absorption coefficient of the whole device is about 0.75, and the effective noise absorption frequency band is 400Hz to 2000Hz with the absorption noise of 15dB as the boundary. 20 dB.

Embodiment 2

[0040] The rock wool substrate in the embodiment 1 is replaced by the carbon fiber wool of 0.5cm, and the carbon fiber wool of the carbon fiber wool sheet through picking or drawing the carbon fiber wool sheet fusion interface surface extends into the second part at least 3mm to form a fusion transition interface layer, carbon fiber The cotton sheet is directly spray-spun into sheets from carbon fiber raw materials with a diameter of 1 micron to 10 microns, and then the interwoven floret feathers are formed by surface picking or hair pulling process, and then carbon fiber cotton sheets are formed by carbonization process, and the carbon fibers on the interface surface are fused. The density of the hair should be at least 50 / cm 2 , the density of floret down feather is at least 5 / cm 2 .

[0041] Under the condition that other settings remain unchanged, the average vertical incidence sound absorption coefficient of the whole device is increased to about 0.9, so that the effecti...

Embodiment 3

[0043] 0.7wt% of hydrotalcite / graphene-like additives and 2wt% of acid anhydride hydrotalcite / aminated carbon black are added to the porous foamed rubber raw material in Example 2 and foamed. Under the ideal test environment, the whole device The average vertical-incidence sound absorption coefficient has been significantly increased to about 0.98, and the effective noise absorption frequency band of absorbing noise of 15 dB is widened to 50 Hz to 3000 Hz. In an ideal laboratory environment, the mixed noise of vertical incidence of 80 dB can absorb 60 Above decibels, the temperature of the continuous incident sound-absorbing material increases, but under the same conditions, compared with the sound-absorbing material of Example 2 without fillers, the noise of the same volume of each frequency is continuously incident, and the temperature is reduced to between 40 and 55 degrees Celsius , it can be seen that the heat dissipation capacity has been significantly improved while the ...

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Abstract

The invention discloses a tunnel honeycomb noise reduction screen, comprising: a cover plate, a hexagonal honeycomb cylinder arranged on the cover plate, a sound absorption material is arranged in the honeycomb cylinder, and a through hole is arranged on the sound absorption material. The cover plate and the hexagonal honeycomb cylinder are made of carbon fiber. Hexagonal honeycomb cylinders are regular hexagons or irregular hexagons. The sound-absorbing material is attached to the sealing plate and the inner wall of the hexagonal honeycomb cylinder. The sound-absorbing material includes a first part and a second part. The second part is a semi-porous sound-absorbing material obtained by directly bonding and foaming the first part as a base. The tunnel honeycomb noise reduction screen provided by the present invention is used for absorbing and reducing reflected noise in the form of tunnel wall pavement or matrix arrangement, reducing the noise outside the cabin to a reasonable range, and then maintaining the noise in the vehicle cabin within a range of 30 to 30 to A comfortable range of around 40 decibels.

Description

technical field [0001] The invention belongs to the technical field of noise reduction devices, in particular to a tunnel honeycomb noise reduction screen. Background technique [0002] At present, the noise treatment in the tunnel mainly relies on the locomotive's own sound insulation material for blocking treatment to reduce the amount of noise reaching the human ear. However, in recent years, with the increase of traffic flow in highway tunnels and the acceleration of locomotives in railway and subway tunnels, the amount of noise in the cavity has been rising rapidly. Simply relying on car body materials cannot completely reduce the noise to an acceptable level for human ears. amount of noise. The traffic flow in the highway tunnel increases, and the noise of the automobile engine, tire friction noise, body structure noise and whistle noise is mixed in the tunnel and bounces and wanders after encountering the rigid tunnel wall, especially in the middle of the tunnel, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01F8/00G01N29/11
CPCE01F8/0005E01F8/0017E01F8/0076E01F8/0082G01N29/11
Inventor 周海林王辉刘祥凯吕东张哲白婷婷沙娜赵福君
Owner 山西省交通环境保护中心站(有限公司)
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