The principle of sound absorbing board mainly involves acoustic impedance matching and multiple reflection, refraction, attenuation and energy conversion of sound waves. The following is a detailed explanation:

The basic principles of sound absorption board sound wave absorption and energy conversion:

When the sound wave meets the sound absorbing board, part of the sound wave will be reflected back, while the other part of the sound wave will penetrate the surface of the board and enter the board. These sound waves entering the plate are then absorbed by the porous material or fiber structure in the plate.

There are a large number of tiny pores or gaps in these porous materials or fiber structures, and when sound waves propagate in these structures, they will friction with the walls of the holes, causing sound energy to be gradually converted into thermal energy or other forms of energy (such as mechanical energy). In order to achieve sound wave attenuation. Acoustic impedance matching:

The design of the sound absorbing board takes into account the principle of acoustic impedance matching, that is, the characteristic impedance of the sound absorbing material matches that of the air, so that the sound wave can enter the sound absorbing material more effectively and be absorbed.

Multiple reflections and refractions:

Sound waves will undergo multiple reflections and refractions inside the sound absorbing board, which further increase the interaction between sound waves and sound absorbing materials, thus improving the attenuation effect of sound waves. The factors that affect the sound absorption effect.

Material properties:

The density, thickness, surface shape and sound absorption frequency of the material will affect the sound absorption effect. Generally speaking, the greater the density of sound-absorbing materials, the thicker the thickness, and the more complex the surface shape (such as porous, rough, etc.), the better the sound absorption effect.

The perforation rate of the sound absorption board will also affect its sound absorption effect, the appropriate perforation rate can improve the acoustic transmittance, and then increase the sound absorption effect. Structural design:

The cavity design on the back of the sound absorption board is also an important factor affecting the sound absorption effect. Reserving a proper cavity can increase the reflection times and path length of sound waves in the board, thus improving the sound absorption effect. At the same time, the cavity filled with sound-absorbing material (such as sound-absorbing cotton) can further enhance the sound-absorbing effect.