The sound intensity was used in the past to describe the surface properties of porous materials. Actually no extensive study used the same concepts to describe the properties of the energy flow inside rigid-frame porous material. In this work, by means of the intensimetric approach, it is demonstrated that the one-dimensional time-averaged transfer of sound energy inside rigid-frame porous materials can be fully described as a diffusion process. Specific parameters are defined to account for materials’ behaviour with respect to the transfer of the sound energy and their relationships with their propagation constants is outlined. The theory is able to fully predict the energetic quantities inside the materials and experimental data to validate the theory are provided and discussed too.
On the diffusion of sound energy in porous materials
PRODI, Nicola
2008
Abstract
The sound intensity was used in the past to describe the surface properties of porous materials. Actually no extensive study used the same concepts to describe the properties of the energy flow inside rigid-frame porous material. In this work, by means of the intensimetric approach, it is demonstrated that the one-dimensional time-averaged transfer of sound energy inside rigid-frame porous materials can be fully described as a diffusion process. Specific parameters are defined to account for materials’ behaviour with respect to the transfer of the sound energy and their relationships with their propagation constants is outlined. The theory is able to fully predict the energetic quantities inside the materials and experimental data to validate the theory are provided and discussed too.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
