Porous materials like acoustic foams can be used for shielding and their absorption abilities depend on the interaction of the acoustic wave and the complex microstructure. In this paper, a homogenization model is proposed to investigate the relation between the microstructure and the macroscopic properties. A numerical experiment is performed in the form of simulations of sound absorption tests on a porous material made from polyurethane. For simplicity, an idealized partially open cubic microstructure is adopted. The homogenization results are evaluated by comparison with Direct Numerical Simulations (DNS), showing a good performance of the approach for the studied porous material. By comparing the results, it is found that Biot's model with the parameters obtained from the homogenization approach predict a higher resonance frequency than the DNS, whereas a full homogenization modification improves the prediction due to the incorporation of the microscopic fluctuation.
|Number of pages||5|
|Publication status||Published - 1 Jan 2020|
|Event||10th European Congress and Exposition on Noise Control Engineering, Euronoise 2015 - Maastricht, Netherlands|
Duration: 1 Jun 2015 → 3 Jun 2015
|Conference||10th European Congress and Exposition on Noise Control Engineering, Euronoise 2015|
|Period||1/06/15 → 3/06/15|