Theory of Sound Absorption of Glass Wool (Chapter 1)?Centrifugal Glass Wool is a kind of porosity material with good sound absorption property. The reason of why Glass Wool can be good at sound absorption is not because the coarse surface but the connecting of interior and exterior of the Glass Wool’s holes inside. When the sound wave shoot the Centrifugal Glass Wool, the sound wave will go into the interior of the material and lead the vibration of the air molecular. The sound energy will be transferred into heat energy due to the rubbing of air viscous vesistance and air molecular.?Centrifugal Glass Wool has good sound absorption property, the aspects which affect the sound absorption effection is thickness, density and air flow resistance rate. Air flow resistance rate is the ratio of the air pressure and air velocity of two flanks per unit weight of the material. Air flow resistance is the most important aspect to work on the sound absorption effection of Centrifugal Glass Wool. If the flow resistance rate is low, the air vibration can penetrate easily, it indicates the rarefaction of the material, of course we can’t have preferable sound absorption purpose from this kind Glass Wool. On the contrary, if the air resistance is high, the air vibration is difficult to sting into the material dut to the densify of the material, sound absorption will be bad also. For Centrifugal Glass Wool, there exists the best air resistance rate of sound absorption. But it’s not easy to test which extent is just to the point. We will talk about in Chapter 2 for this question.?Centrifugal Glass Wool is a kind of porosity material with good sound absorption property. The reason of why Glass Wool can be good at sound absorption is not because the coarse surface but the connecting of interior and exterior of the Glass Wool’s holes inside. When the sound wave shoot the Centrifugal Glass Wool, the sound wave will go into the interior of the material and lead the vibration of the air molecular. The sound energy will be transferred into heat energy due to the rubbing of air viscous vesistance and air molecular.?Centrifugal Glass Wool has good sound absorption property, the aspects which affect the sound absorption effection is thickness, density and air flow resistance rate. Air flow resistance rate is the ratio of the air pressure and air velocity of two flanks per unit weight of the material. Air flow resistance is the most important aspect to work on the sound absorption effection of Centrifugal Glass Wool. If the flow resistance rate is low, the air vibration can penetrate easily, it indicates the rarefaction of the material, of course we can’t have preferable sound absorption purpose from this kind Glass Wool. On the contrary, if the air resistance is high, the air vibration is difficult to sting into the material dut to the densify of the material, sound absorption will be bad also. For Centrifugal Glass Wool, there exists the best air resistance rate of sound absorption. But it’s not easy to test which extent is just to the point. We will talk about in Chapter 2 for this question.
