Acoustic quieting

Subsonic dampening means a disability of sound propagation by absorption of airborne sound. Wherein the sound absorption, the sound energy is converted to non-audible waves of vibration energy, and accordingly reduces the reflection at an interface. The distinct, Sound insulation refers to the obstruction of the sound propagation of airborne sound or structure-borne sound to adjacent rooms through sound reflection of the propagating sound at each discontinuity.

The physical mechanisms of sound absorption take place in the immediate vicinity of interfaces:

• Viscous drag in the hydrodynamic boundary layer,
• In the thermal boundary layer of the fluid, the thermal state change is no longer lossless sound during operation. Due to the heat transfer from the wall and the state change is not isentropic or adiabatic, while this is the case at a greater distance from the wall.

The mechanisms are dependent on the size of the interface ( surface ) from. The absorption of airborne sound is done very efficiently in porous materials having open pores which have a large internal surface. To the acoustic characteristics of a room (for example, the reverberation time ) to improve targeted sound absorbing components can be used.

The sound absorption or sound absorption is a characteristic of the room acoustics. In contrast, the basis of architectural acoustics is the sound insulation ( how much sound passes into the next room ), which is characterized by the reduction value of R in dB.

Schalldämpfstoffe are materials in which the sound propagation in a strong, by Schalldissipation (dissipation ) induced attenuation is subjected.