Micro-perforated sound absorbers in stretched materials

Christian Nocke , Catja Hilge , Jean-Marc Scherrer

The theory of microperforated panel sound-absorbing constructions has been introduced by D.-Y. Maa in 1975. Since then many variations of micro-perforated sound absorbing devices and materials have been introduced. Materials that have been used to be micro-perforated have been metal, wood, plastics and many others. In 2001 a nearly invisible micro-perforation has been introduced to the stretched material making it highly sound absorptive. Over the last ten years different set-ups made of micro-perforated layers, porous materials as well as plate resonators have been investigated. In this contribution measured sound absorption coefficients of various set-ups with micro-perforated stretched foils and different other acoustic materials will be presented. For these assemblies no closed calculation model exists so far. Theoretical approaches towards layered sound absorbers with micro-perforated components will be suggested. Future developments in the field of micro-perforation in room acoustics will be discussed. Finally applications will be presented.

Mots clés: microperforation; sound absorber; room acoustics; applications

Domaines: Acoustique [physics.class-ph]

Christian Nocke, Catja Hilge, Jean-Marc Scherrer. Micro-perforated sound absorbers in stretched materials. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811350⟩