Effects of compression on the sound absorption of porous materials with an elastic frame

The absorption characteristics of a porous material are well known to vary during compression. The transfer matrix method is applied with an elastic frame to explore the effect of compression on absorption properties. In this work, the materials are treated as elastic rather than being made of rigid models. The absorption coefficients of the uncompressed and compressed porous material are initially calculated and verified from the experimental measurements. Then, numerical predictions of absorption coefficient are made for the compressed porous material.