A road cellular noise reduction screen

A honeycomb and noise reduction technology, applied in the direction of noise absorption devices, buildings, etc., can solve the problems of noise rebound and superposition, can not reduce noise, can not absorb, etc., achieve the effect of uniform aperture, high absorption rate, high absorption rate

Active Publication Date: 2022-07-15
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

[0002] In recent years, with the increase of traffic flow on the expressway, the amount of road noise has risen rapidly. Although the noise outside the road can be reduced to a certain extent through the sound insulation screen, the noise of automobile engines, tire friction noise, vehicle body structure noise and whistle noise in the road area Mixing and bouncing after encountering the surface of the rigid sound insulation screen, the noise bounces and superimposes and cannot be absorbed. Simply relying on the material of the car body can no longer completely reduce the noise to the acceptable noise level of the human ear

Method used

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  • A road cellular noise reduction screen
  • A road cellular noise reduction screen
  • A road cellular noise reduction screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 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

[0043] 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 .

[0044] 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

[0046] 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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PUM

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Abstract

The invention discloses a road honeycomb noise reduction screen, comprising: a cover plate, a honeycomb cylinder arranged on the cover plate, a sound absorption material is arranged in the honeycomb cylinder, and through holes are arranged on the sound absorption material; a highway honeycomb A mass block is set in the hexagonal honeycomb cylinder in the sound insulation area at the bottom of the noise reduction screen. The mass block and the honeycomb cylinder are filled with sound-absorbing material and sealed. The quality of the mass block decreases layer by layer from bottom to top. They are set at an angle of 90° to 150° in the form of a folding screen or a folding fan. The road honeycomb noise reduction screen provided by the present invention can reduce the noise on the road to a reasonable range while achieving a low level of off-road noise by means of absorption and negative reflection, thereby maintaining the noise in the vehicle cabin at an acceptable 20 decibels for human ears comfort range left and right.

Description

technical field [0001] The invention belongs to the technical field of noise reduction devices, in particular to a road honeycomb noise reduction screen. Background technique [0002] In recent years, with the increase of traffic flow on the expressway, the amount of road noise has increased rapidly. Although the noise outside the road can be reduced to a certain extent through the sound insulation screen, the noise of the car engine, tire friction, body structure and whistle noise in the road area Mixed and bounced and wandered after encountering the surface of the rigid sound insulation screen, the noise bounced and superimposed, and could not be absorbed. Simply relying on the car body material could not completely reduce the noise to an acceptable amount of noise for the human ear. SUMMARY OF THE INVENTION [0003] The invention provides a road honeycomb noise reduction screen, which can reduce the noise outside the cabin to a reasonable range by means of absorption an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01F8/00
CPCE01F8/0076E01F8/0017E01F8/0082
Inventor 刘祥凯王辉周海林吕东张哲白婷婷沙娜宋广龙
Owner 山西省交通环境保护中心站(有限公司)
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