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The centrifugal glass wool has fluffy and interlaced fibers with a large number of tiny pores, which is a typical porous sound-absorbing material with good absorption properties. acoustic characteristics. Centrifugal glass wool can be made into wall panels, ceilings, space sound absorbers, etc. It can absorb a large amount of sound energy in the room, reduce the reverberation time, and reduce indoor noise. <>
The sound absorption characteristics of centrifugal glass wool are not only related to thickness and bulk density, but also related to factors such as covering material and structural structure. In construction applications, it is also necessary to take into account many aspects such as cost, aesthetics, fire protection, moisture resistance, dust, and aging resistance. <>
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 that connect the inside and outside. When sound waves are incident on centrifugal glass wool, the sound waves can enter the interior of the material along the pores and cause the vibration of air molecules in the gaps. Due to the viscous resistance of the air and the friction between air molecules and pore walls, the sound energy is converted into heat energy and is lost. <>
Centrifugal glass wool has good sound absorption performance for medium and high frequencies. The main factors affecting the sound absorption performance of centrifugal glass wool are thickness, density and air flow resistance. Density is the weight of material per cubic meter. Air flow resistance is the ratio of air pressure and air flow 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. If the flow resistance is too small, it means that the material is sparse and air vibrations are 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 and the air vibrations are difficult to pass through and the sound absorption performance is also reduced. It is difficult to measure air flow resistance in actual engineering, but it can be roughly estimated and controlled through thickness and bulk density. , As the thickness increases, the sound absorption coefficient of medium and low frequencies increases significantly, but the high frequency does not change much (high frequency absorption is always larger). , the thickness remains constant and the bulk density increases, the sound absorption coefficient of medium and low frequencies also increases; but when the bulk density increases to a certain level, the material becomes dense and the sound absorption coefficient decreases instead. For centrifugal glass wool with a bulk density exceeding /, the low frequency is about . The sound absorption coefficient at medium and high frequencies (&;) is already close to. When the thickness continues to increase, the low-frequency sound absorption coefficient gradually increases. When the thickness is greater than the above, the low-frequency sound absorption coefficient will also be close to. When the thickness remains constant and the bulk density increases, the low-frequency sound absorption coefficient of centrifugal glass wool will also continue to increase. When the bulk density approaches /, the sound absorption performance reaches a maximum value, and the frequency is close to -. When the bulk density exceeds /, the sound absorption performance decreases instead because the material becomes denser. The mid- and high-frequency sound absorption performance is greatly affected. When the bulk density exceeds /, the sound absorption performance decreases a lot. The thickness of sound-absorbing glass wool commonly used in architectural acoustics is ,, and the bulk density is ,,,,,,/. Usually thick-//thick centrifugal glass wool is used. <>
The sound absorption performance of 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 similar to that of a glass wool board of the same thickness without an air layer. In particular, the mid- and low-frequency sound absorption performance will be greatly improved when the material is actually attached to a hard bottom surface. The sound absorption coefficient will increase with the thickness of the air layer, but the effect will not be obvious after it increases to a certain value. <>
Using glass wool with different bulk weights stacked together to form a gradually increasing bulk density can achieve a greater sound absorption effect. For example, the sound absorption effect of stacking a layer of . The average sound absorption coefficient can be close to the average sound absorption coefficient when the surface density of the material gradually increases.