2. Materials used for the internal treatment of rooms
The five families of materials studied in this article are :
diaphragms ;
Helmholtz resonators ;
porous materials with rigid walls ;
porous materials with deformable walls ;
combinations of the above.
2.1 Diaphragms
Diaphragms operate according to the damped oscillator principle (mass-spring system) but, for practical reasons, they are made of flexural panels, i.e. large plates capable of vibrating in bending, preferably in their fundamental mode.
These panels are generally placed at a certain distance from the walls of the room, so as to create...
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Materials used for the internal treatment of rooms
Physical principles involved in the transmission of sound waves through walls
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