A space absorber is a sound absorbing member that is dispersed in a sound field (usually under the ceiling of a room or hall). According to the use of occasions and sound absorption need to make the appropriate geometry and size, generally it consists of four parts: ① skeleton. As a support, you can use wooden tendons, angle steel or thin-walled steel. ② care layer. Common perforation rate greater than 20%, the thickness of 0.1-1.0mm perforated or slit thin metal, aluminum foil or plastic sheet. Perforation hole to take 4-8mm. ③ sound absorption filler. General use of ultra-fine glass wool felt, mineral wool felt, asphalt glass wool felt and other porous materials, and fiberglass cloth and other breathable performance is good, but also a certain strength of the material for masked layer.
In the humid environment, can also be used single or double perforated plate for the sound absorption layer (to increase the absorption of low frequency, perforation rate is generally less than 5%), instead of porous materials. ④ hanging pieces. Such as metal lugs, hooks, bolts and so on. When used, the surface are placed in the sound field, is conducive to give full play to the sound absorption of the material. The effective sound absorption area of ??a single sound absorber is much larger than the geometric projection area, so if the projection area is calculated, the sound absorption coefficient can be greater than one. The characteristic is usually expressed by the effective sound absorption, which depends not only on the nature of the body itself but also on the interval between the absorbers but not in a linear proportion. So the best design should be the use of the least sound absorber unit, get as much as possible sound absorption effect. It is generally believed that if the plate-like sound absorber is used, the total area is 30% -40% of the flat top area of ??the room, the sound absorption efficiency can reach the best value and the economic effect is the best. Space absorber is mainly used to reduce the reverberation time in the hall and factory workshop and the sound level of the reverberation field. It has many advantages such as flexible design, simple installation, convenient installation and beautiful appearance. But it should also be noted that only in the original indoor sound absorption is very small, reverberation field is very strong circumstances, and the noise reduction effect is usually not more than 10dB, generally between 3-8dB, the best will not exceed 15dB The
