The use of Vacuum Packed Particles with adaptable properties in acoustic applications

The aim of this paper is to present possibilities of using a new type of granular media in
acoustics as innovative sound absorbers. Most materials of this type have a porous or fibrous
structure. It is constant, and once manufactured, does not easily change its configuration.
The examined material – Vacuum Packed Particles (VPP) is of a changeable structure.
It can be assumed that the acoustical absorption of such structures can be modified and
partially adjusted by an external factor. First steps in an experimental approach have been
made – the acquired results are optimistic. Additional tests are being planned to confirm
the observed phenomenon and to apply VPP as novel materials in acoustics. Basing on the
preliminary experimental tests, it can be concluded that the considered structures could
become a significant part of a multilayered structure which would have controllable sound
absorption properties.