Influence of underpressure on acoustic properties of semi-intelligent vacuum packed particles

Abstract

This research is the next step in studying the properties of so called Special Granular Structures (vacuum packed particles). Started about ten years ago, the work has shown these materials to be a very interesting research subject (having controllable physical properties, depending on applied underpressure). The properties of investigated granular structures described in previous papers led author to believe, that also acoustic characteristics may change with applied underpressure. This work shows new potential possibilities of Special Granular Structures application (such as acoustic panels with controllable acoustic properties). Presented results prove, that acoustic properties of these materials can be controlled. © Springer International Publishing Switzerland 2014.