Sustainable acoustic absorbers from the biomass

Abstract

A combination of impedance tube and reverberation chamber measurements has been carried out for a number of biomass materials and the effectiveness of current models for the prediction of the absorptive properties of natural fibres has been investigated. Examination of the acoustical characteristics of a range of natural fibres has confirmed their effectiveness as porous sound absorbers and also the limitations of current models for predicting their performance. Examination of the acoustical performance of materials consisting of different configurations of whole reeds has revealed that these also possess considerable potential for application as broadband sound absorbers with particularly good low frequency absorption characteristics.