Noise reduction structure at top end of sound barrier based on diffuser coupling micro-perforated plate

Abstract

The invention discloses a noise reduction structure at the top end of a sound barrier based on a diffuser coupling micro-perforated plate, which comprises an outer protection panel and a diffuser structure, the outer protection panel and the diffuser structure are coupled to form an integral structure and are connected with an upper screen body, and the upper screen body is connected with an I-shaped steel beam structure in an inserting manner. The optimized acoustic diffuser structure is coupled with the micro-perforated plate structure, the structure width is reduced, the engineering application requirement is met, meanwhile, the streamlined outer panel is utilized, the modeling is simple and attractive, the sound diffusion and absorption effects of the structure are adopted, additional sound absorption materials are not needed, and the problem that the noise reduction performance is reduced due to the fact that a porous sound absorption material loses efficacy along with time in a common sound barrier is solved. The structure is small in size width, simple in structure, convenient to install, long in service life and stable and effective in noise reduction effect for a long time.

Description

technical field [0001] The invention relates to the field of noise reduction engineering, in particular to a noise reduction structure at the top of a sound barrier based on a diffuser coupled micro-perforated plate. Background technique [0002] As an effective measure to control the way of noise transmission, sound barrier has been widely used in the noise reduction treatment of traffic noise and large noise equipment. In actual engineering, due to the limitation of installation cost, structural rigidity and space size, the limited installation height of the sound barrier often fails to meet the noise reduction requirements. In order to further improve the insertion loss of the sound barrier, a noise reducer is installed on the top of the sound barrier without increasing the height, which can reduce the diffraction sound energy and effectively improve the insertion loss of the sound barrier. [0003] In existing projects, the common top noise reducer generally adopts a sp...

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Problems solved by technology

[0003] In existing projects, the common top noise reducer generally adopts a spherical or mushroom-shaped structure filled with porous sound-absorbing materials inside. The porous sound-absorbing materials are in the natural environment, with dust accumulation, rain erosion, material aging, etc., It is easy to cause a decrease in sound absorption performance, resulting in a decrease in the insertion loss of the sound barrier year by year

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