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

Abstract

The invention belongs to the acoustical technical field and relates in specific to a novel non-fiber type and micropunched sound absorption type sound barrier body with transition cavity. The invention comprises a micropunched panel, a top face, a bottom face, a left end face, a right end face and a back plate; the micropunched panel, the top face, the bottom face, the left end face, the right end face and the back plate are connected to form a closed cavity; the cavity depth appears in a linear transition; the maximum depth is 2.5 to 3.5 times as the minimum depth. The micropunched panel is arranged with micropores with total occupied area of 0.5 percent to 3 percent of the panel area; the micropore aperture is 0.6 to 1.2mm. In actual use, it is only necessary to mount the invented device into a sound barrier vertical column or other places for sound absorption process. The invented device is characterized in being simple, easy and convenient manufacturing, thin shape and being light and having perfect sound absorption performances. Sound absorption band width with sound absorption factor higher than 0.4 exceeds 2 octaves. Therefore, the invention has advantages of broad application scope, easy purging, high-temperature resistance, and superior weather ability. Besides, the invented device can be completely recycled for use to thoroughly avoid the problem of secondary pollution, for which the invention has superior environmental protection function.

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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