Wall sound-absorbing perforated plate, special for

2022-07-22
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Wall sound-absorbing perforated plate is specially used for damp proof in basement Moisture proof performance Huajiang ceiling, as the base material of glass fiber itself is an inorganic material, does not absorb water

can effectively reduce indoor noise, make the working environment more comfortable and the transmission of sound clearer

about glass wool sound-absorbing materials

centrifugal glass wool is a porous sound-absorbing material with good sound-absorbing properties. The reason why centrifugal glass wool can absorb sound is not because of its rough surface, but because it has a large number of tiny pores and holes connected internally and externally. When the sound wave is incident on the centrifugal glass wool, the sound wave can enter the material along the pores, causing the vibration of air molecules in the pores. Due to the viscous resistance of air and the friction between air molecules and pore walls, sound energy is converted into heat energy and lost

the main factors affecting the sound absorption performance of centrifugal glass wool are thickness, density and air flow resistance. Density is the weight per cubic meter of material. Air flow resistance is the ratio of air pressure and air velocity on both sides of the material per unit thickness

air flow resistance is the most important factor affecting the sound absorption performance of centrifugal glass wool. The flow resistance is too small, indicating that the material is sparse, the air vibration is easy to pass through, and the sound absorption performance is reduced; If the flow resistance is too large, it means that the material is dense, air vibration is difficult to be transmitted, and the sound absorption performance is also reduced. For centrifugal glass wool, there is the best flow resistance in sound absorption performance

in practical engineering, it is difficult to measure the air flow resistance, but it can be roughly estimated and controlled by thickness and bulk density

a. with the increase of thickness, the medium and low frequency sound absorption coefficient increases significantly, but the high frequency changes little (the high frequency absorption is always large)

b, the thickness remains unchanged, the unit weight increases, and the medium and low frequency sound absorption coefficient also increases; However, when the bulk density increases to a certain extent, the material becomes dense, the flow resistance is greater than the optimal flow resistance, and the sound absorption coefficient decreases. When the unit weight is close to 110kg/m3, the sound absorption performance reaches the maximum value. When the unit weight exceeds 120kg/m3, the sound absorption performance decreases instead, because the sound absorption performance of the material

centrifugal glass wool is also closely related to the installation conditions. When there is an air layer behind the glass wool board, the sound absorption effect is improved compared with the glass wool board without an air layer of the same thickness. In particular, the medium and low frequency sound absorption performance will be greatly improved than that of the material pasted on the hard bottom. The sound absorption coefficient will increase with the increase of the thickness of the empty gas layer, but the effect will not be obvious when it increases to a certain value

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