Sound absorption mechanism, material modification and structural design of various
synthetic fiber materials for industrial noise reduction are reviewed in this paper for the …

Performance of classic sound absorbing materials strictly depends on their thickness, with a
minimum of one-quarter wavelength to reach full sound absorption. In this paper, we report …

The effect of cellular structure in the flexible polyurethane foams on the sound absorption
behavior is investigated for improved sound environment within vehicles. Two types of …

This work designs a tunable acoustic composite metasurface, with porous material and a
modified microperforated panel (MPP) system. The broadband sound absorption …

This work presents benchmark examples related to the modelling of sound absorbing
porous media with rigid frame based on the periodic geometry of their microstructures. To …

At first glance, it seems that modern, inexpensive additive manufacturing (AM) technologies
can be used to produce innovative, efficient acoustic materials with tailored pore …

Satisfactory sound absorption using a low mass density foam is an intriguing desire for
achieving high fuel efficiency of vehicles. This issue has been dealt with a microcellular …

In rods and beams, piezoelectric patches with external circuits have been extensively
studied to dampen structural vibrations at the sound source. This work uses a large flat-layer …

The present paper proposes to investigate the links between the microstructure of
polyurethane foams and their sound absorbing efficiency, and more specifically the effect of …

This article explores the applicability of numerical homogenization techniques for analyzing
transport properties in real foam samples, mostly open-cell, to understand long-wavelength …