In all kinds of building decoration, different places according to the use of different, sound absorption requirements are different. In order to achieve the desired sound absorption of the building, how to choose a reasonable sound-absorbing material? The following sound-absorbing materials are divided into two categories to illustrate the fiber porous sound-absorbing material and perforated plate sound-absorbing material (Helmholtz resonance sound absorption principle).
Fiber porous sound-absorbing material Sound absorption principle: fiber porous sound-absorbing material, such as centrifugal glass wool, rock wool, mineral wool,Sound Absorptive Tiles plant fiber spraying, etc. The sound absorption principle is a large number of tiny pores in the material, Can be deep inside the material, and material friction occurs to the sound energy into heat.
Fiber porous sound absorption material sound absorption characteristics: with the frequency increases the sound absorption coefficient gradually increased, which means that low-frequency absorption is not high-frequency absorption is good.
Centrifugal glass wool internal fiber fluffy staggered, there are a large number of tiny pores, is a typical porous sound-absorbing material, with good sound absorption characteristics. Centrifugal glass wool can be made of wall panels, ceilings, space sound absorbers, etc., can absorb a lot of room sound energy, reduce reverberation time, reduce indoor noise.
And centrifugal glass wool similar to the porous fiber sound-absorbing materials are rock wool, mineral wool board, perforated poly-flame retardant ammonia, cellulose spray, sound-absorbing curtains and so on.
Practical application: In the gymnasium, workshop and other large space, in order to sound noise reduction, often use centrifugal glass wool as the main sound-absorbing material of the body. The absorber can be made into a plate, column, cone or other shaped body as required. The interior of the body is filled with centrifugal glass wool and the surface is wrapped with a sound-permeable surface. As the sound absorber has a number of surface sound absorption, sound absorption efficiency is high. In the road noise barrier, in order to prevent noise reflection,Sound Absorptive Tiles need to take the sound side of the vehicle side of the measures, often also use centrifugal glass wool as a filler material, the surface layer of perforated metal plate barrier. In order to prevent the glass wool in the outdoor moisture damp, sometimes use PVC or plastic film wrapped.
Helmholtz resonance sound absorption principle: with the walls or ceilings exist in the air layer perforated plate, this structure also has sound absorption performance, such as perforated gypsum board, wood, metal plate, and even slit sound absorption brick. The sound absorption principle is similar to the acoustic resonance of the thermos bottle. The external space of the material is connected with the inner cavity through a narrow bottleneck. When the sound waves are incident, there is a strong resonance between the air and the internal space at the resonant frequency. The This type of sound absorption is called Helmholtz resonance sound absorption.
Helmholtz resonance resonance characteristics: perforated plate sound absorption on the sound frequency has a certain selectivity, sound absorption frequency characteristic curve was mountain shape, when the sound frequency and resonance frequency close to the sound absorption coefficient;Sound Absorptive Tiles when the sound frequency away from the resonant frequency , The sound absorption coefficient is small. Only in the resonant frequency has a larger sound absorption coefficient.
Paper pierced gypsum board commonly used in building decoration sound absorption. The gypsum board itself does not have good sound absorption performance, but after perforation and installed with a certain rear cavity of the ceiling or wall can be formed "Helmholtz resonance" sound absorption structure, and thus get larger Of the sound absorption capacity.
Similar to perforated paper gypsum board perforation resonance sound absorption structure is cement perforated plate,Sound Absorptive Tiles wood perforated plate, metal perforated plate and so on.
Practical application: cement and wood perforated plate sound absorption performance close to the perforated paper gypsum board, cement perforated plate low cost, but poor decoration, commonly used in the engine room, basement and other sound absorption; wood perforated plate beautiful,Sound Absorptive Tiles good decoration, but fire , Poor water resistance, high prices, commonly used in hall sound reinforcement. Metal perforated plate commonly used as sound absorption ceiling, or sound absorption wall.
Of course, in the application of the building, but also need to take into account the sound absorption material and sound absorption structure of the sound absorption performance should be stable, fire, durable, non-toxic, affordable, easy construction, no secondary pollution, beautiful and practical.