Over the past 50 years, the characterisation of porous sound absorbing materials has been
of increasing interest to both the acoustic engineers and customers. It is particularly …

Insulating low-frequency sound using lightweight structures is very difficult according to the
classical mass law. To challenge this problem, we present a comprehensive theoretical …

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

This paper presents a straightforward application of an indirect method based on a three-
microphone impedance tube setup to determine the non-acoustic properties of a sound …

Background The background of the study involves the characterization of porous media
using an innovative acoustic method. The researchers focus on determining specific …

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 …

The theoretical relationship between the viscous loss of sound wave and fiber structure
parameter (fiber density) and pore structure parameters (pore diameter and porosity) of …

The feasibility of a data-based artificial neural network (ANN) for the estimation of the sound
absorption coefficient of a layered fibrous material is investigated in this study. The sound …

A technique is proposed that uses a multi-scale approach to calculate transport properties of
compressed felts using only image analysis and numerical calculations. From the image …

This paper proposes simple semi-phenomenological models to predict the sound absorption
efficiency of highly porous polyurethane foams from microstructure characterization. In a …