New Controllable Sound Absorbers Made of Vacuum Packed Particles
This article reveals a part of experimental research performed on Special Granular Structures (SGS). These structures have some features that are common to smart materials. Authors earlier papers from last decade were focused mainly on research and modeling of the mechanics of the discussed materials. Possibilities of changing the physical properties of granular materials urged the authors to try and test experimentally if the acoustic parameters of granular structures may also be controlled by the underpressure parameter. A series of laboratory tests regarding the influence of selected parameters on the sound absorption coefficient of SGS prove that there is a simple way of controlling mentioned the acoustic characteristics of tested structures. This unique feature enables their usage as a part of multi-later absorbing structures with variable characteristics.
Keywordsspecial granular structures absorption coefficient controllable sound absorption
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