A sound barrier with an air resonant cavity

Abstract

The invention provides a sound barrier containing an air resonance cavity, which relates to the field of road noise reduction. The sound barrier containing the air resonant cavity includes a first panel and a second panel arranged in parallel at intervals, a Helmholtz resonator is arranged between the first panel and the second panel, and the Helmholtz resonator is a hollow tube structure. A Helmholtz resonator is provided inside the Helmholtz resonator, and a plurality of through holes are opened on the Helmholtz resonator; a first sound-absorbing column structure is also arranged between the first panel and the second panel, and the second A sound-absorbing column structure includes a first sound-absorbing pipe body and a sound-absorbing filler, and a plurality of perforations are opened on the first sound-absorbing pipe body. When external noise enters the Helmholtz resonant cavity through the through hole, the air column in the Helmholtz resonant cavity undergoes resonant motion, and the resonant motion of the air column offsets the sound waves of the noise, which is equivalent to a dynamic vibration absorber The spring-additional mass system on the top effectively eliminates the noise sound waves on a specific frequency.

Description

technical field [0001] The invention relates to the technical field of road noise reduction, in particular to a sound barrier containing an air resonance cavity. Background technique [0002] With the rapid development of highways, urban expressways and rail transit, while providing convenience for people's travel, it also causes the problem of noise pollution. Among them, sound barriers are the main means to solve road traffic noise. Sound barriers usually use sound-absorbing materials to absorb noise or use sound-insulating materials to block sound transmission. [0003] The sound barrier is also called "soundproof wall". For example, the Chinese invention patent application with the application publication number CN108005270A and the application publication date of 2018.05.08 discloses a wall with a sound insulation function, and specifically discloses that the wall includes a U-shaped wall. The keel, the inner cavity of the U-shaped keel is provided with sound-absorbing...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the object of the present invention is to provide a sound barrier containing an air resonant cavity, so as to solve the problem that the existing sound barrier cannot effectively shield and eliminate the noise of a specific frequency, and the noise reduction effect of the entire sound barrier is poor.

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