Anomalous sound absorption in lattices of cylindrical perforated shells
Abstract
This work reports the enhancement of sound absorption by sonic crystals slabs made of cylindrical perforated shells. These building units, with perforations of millimeter size, show small losses and cannot explain the strong absorption observed at some specific frequencies when the slabs consist of just a few number of rows. It is found that this phenomenon is due to a resonant Wood anomaly which occurs when the incident wave couples with a leaky guided mode supported by the slab. This effect results in an enhancement of the absorption, since the energy transferred to the guided mode travels within the slab, along a direction perpendicular to the incident one. Multiple scattering and finite element simulations give support to the proposed behavior, the transmittance results being in good agreement with experimental data previously reported.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 23, 2015
- Source ID
- 10.1063/1.4916509
Entities
People
- Jose Sanchez-Dehesa
- Victor M. Garcia-chocano
Organizations
- Ministry of Economy, Industry and Competitiveness
- Office of Naval Research
- Technical University of Valencia