What is the sound absorption coefficient

What is the sound absorption coefficient

Generally, the difference between the incident sound energy El and the reflected sound energy ER is called the sound absorption coefficient, which is A, that is, the value of El minus ER divided by El is the sound absorption coefficient A

How much is the sound absorption coefficient?

The material with sound absorption coefficient is considered as sound absorption material

Materials with sound absorption coefficient A above 0.2 are called sound absorption materials

Materials with sound absorption coefficient A above 0.5 are ideal sound absorption materials

How is the value of sound absorption coefficient defined?

The value of sound absorption coefficient A is between 0-1

When A=0, it means that the sound energy is fully reflected and the material is not sound absorbing

When A=1, it means that the material absorbs all sound energy without reflection

The higher the value of sound absorption coefficient, the better the sound absorption performance of the material or structure

The value of sound absorption coefficient A is related to the frequency of the incident sound wave. The same material has different values of sound absorption coefficient for different frequencies of sound waves

Will sound be absorbed when encountering solid materials?

During the propagation of sound waves, part of the sound energy is reflected, part of the sound energy enters the material and is absorbed, and a small part of the sound energy is projected to the other side.

What are the commonly used sound absorption materials?

Porous sound-absorbing materials are most commonly used, and sometimes flexible materials and film-like materials can also be selected. In engineering, porous sound-absorbing materials are often made into various geometric bodies for use.

Commonly used porous sound-absorbing materials include Corning glass wool, Corning slag wool, Corning rock wool, foamed plastics, asbestos felt, wood wool board, soft fiber and microporous sound-absorbing bricks.