Gradual-change cavity microperforated broad band sound absorption type sound barrier

Abstract

The invention belongs to the technical field of acoustics, and in particular relates to a non-fiber novel gradually changing cavity micro-perforated sound-absorbing sound barrier body. It is composed of micro-perforated panel, upper end surface, lower end surface, left end surface, right end surface and back plate. The micro-perforated panel, upper end surface, lower end surface, left end surface, right end surface and back plate are connected to form a closed cavity, and the depth of the cavity is linear Gradient, the maximum depth is 2.5-3.5 times the minimum depth. The microperforated panel is distributed with micropores occupying an area of ​​0.5% to 3% of the panel area, and the diameter of the micropores is 0.6 to 1.2mm. When in use, it only needs to install the present invention in the column of the sound barrier or other places requiring sound absorption treatment. The invention has the advantages of simple device, easy processing, thin shape and light weight, excellent sound absorption performance, the sound absorption frequency band width of which the sound absorption coefficient is greater than 0.4 exceeds 2 octaves, wide application, easy cleaning, high temperature resistance, and excellent weather resistance , can be completely recycled, completely avoiding the problem of secondary pollution, and has excellent environmental protection functions.

Description

technical field [0001] The invention belongs to the technical field of acoustics, and specifically relates to a gradually changing cavity micro-perforated broadband sound-absorbing sound barrier body used on both sides of a traffic arterial road and in an environment with serious noise pollution. Background technique [0002] While the increase of economic activities improves people's living standards, it also makes the problem of noise pollution more and more serious. Complaints caused by the impact of noise pollution on people account for more than 50% of all kinds of environmental complaints in economically developed cities, especially traffic noise. Complaints rank first among noise complaints. [0003] Noise barrier is one of the important measures in traffic noise control technology. At present, the sound-absorbing sound barriers commonly used at home and abroad are mostly porous fiber materials such as glass wool, rock wool, etc., plus perforated protective panels. ...

AI Technical Summary

Problems solved by technology

The double-layer micro-perforation device can solve the problems of weather resistance and secondary pollution of traditional fiber materials, but the processing is more complicated and the cost is high when used on the sound barrier

Foam glass has the disadvantage of being fragile, the sound absorption coefficient is 0.4-0.6, and the sound absorption frequency band is narrow

Polyurethane sound-absorbing foam has disadvantages such as high temperature resistance and poor weather resistance

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