Principle of soundproof wallboard.

Sound absorption principle: 

Soundproof wallboard is usually composed of multiple layers of materials, and there is a certain gap between each layer of materials. These voids can absorb sound waves, reduce the reflection and transmission of sound waves, and thus achieve the effect of blocking noise.

Sound insulation principle: 

The sound insulation principle of the sound insulation wall panel is that the greater the unit dense surface density of the sound insulation material, the greater the volume isolation, and the surface density is proportional to the volume isolation.

Sound barrier reflection principle: 

when both sides of the sound source are sound barriers, and the sound barrier is parallel, the sound wave will be reflected between the sound barrier many times, and across the top of the sound barrier radiation to the sound point, it will reduce the insertion loss of the sound barrier, the insertion loss caused by the reflected sound wave is called the reflection reduction amount. In order to reduce the reflected sound, the sound absorption structure is generally attached to the side of the sound barrier near the sound source.