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Source：en.huidol.com Release：2019-02-12 Views：1398 Returns
The principle of sound absorption:
Any material on the incident sound can have more or less some sound absorption capacity, the average sound absorption coefficient of more than 0.2 material is called sound absorption material.The characteristics of the sound absorption frequency of porous sound absorption material are: medium and high frequency sound absorption coefficient is large, low frequency sound absorption coefficient is small.
The process by which sound waves decrease when they pass through the media or when they encounter a material surface. Sound absorption is generally characterized by sound absorption coefficient, and the method of testing material sound absorption is reverb chamber method and acoustic impedance tube method. The former is mostly used in engineering, while the latter is mostly used for laboratory test ingress. The sound absorption coefficient a5 measured by the reverb chamber, in which V is the volume of the reverb chamber, m3; S is the sample area, m2; C is the speed of sound in the air, m/s;T60-1, T60-2 are the reverb times for empty rooms and reverb chambers after the specimenises are placed.