Sound barrier with air resonant cavity

Abstract

The invention provides a sound barrier with an air resonant cavity, and relates to the field of road noise reduction. The sound barrier with the air resonant cavity comprises a first panel and a second panel which are arranged in parallel at intervals, a Helmholtz resonator is arranged between the first panel and the second panel, the Helmholtz resonator is of a hollow pipe structure, the Helmholtz resonator is internally provided with a Helmholtz resonant cavity, and a plurality of through holes are formed in the Helmholtz resonator; a first sound absorption column structure is further arranged between the first panel and the second panel, the first sound absorption column structure comprises a first sound absorption pipe body and sound absorption filler, and a plurality of through holesare formed in the first sound absorption pipe body. When external noise enters the Helmholtz resonant cavity through the through hole, the air column in the Helmholtz resonant cavity generates resonance motion, the resonance motion of the air column plays a role in counteracting sound waves of the noise and is equivalent to a spring-additional mass system on the dynamic vibration absorber, and thenoise sound waves at the specific frequency are effectively eliminated.

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 has also caused 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 the transmission of sound. [0003] Sound barrier is also called "sound insulation wall". For example, the Chinese invention patent application with application publication number CN108005270A and application publication date of 2018.05.08 discloses a wall with sound insulation function, and specifically discloses that the wall includes U-shaped Keel, the inner cavity of the U-shaped keel is equipped with sound-absorbing cotton, ...

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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