Most of the analytical models devoted to determine the acoustic properties of a rigid perforated panel consider the acoustic impedance of a single hole and then use the porosity to determine the impedance for the whole ...

[EN] Recent trends in waste management have initiated interest in recycled materials for sound absorption applications. The present paper studies the possibility of paper sludge to be recycled as material for sound absorption ...

Polyurethane foam waste is one of the residues of the manufacturing processes in textile industry, the disposal of which is becoming a severe environmental problem. In this paper the sound absorption properties of different ...

[EN] In recent years, natural materials are becoming a valid alternative to traditional sound absorbers due to reduced production costs and environmental protection. This paper reports the acoustical characterization of ...

[EN] Acoustic treatments in buildings have been traditionally used in specific places, limited to certain uses such as auditoriums, theatres, rehearsal rooms ... Today's society is increasingly aware of the problem of noise ...

Este trabajo fin de máster consiste en la realización de un estudio numérico mediante elementos finitos sobre sistemas de mitigación sonora del ruido producido por los cohetes espaciales durante la fase de despegue. Este ...

A systematic study of noise barriers based on sonic crystals made of cylinders that use recycled materials like absorbing component is reported here. The barriers consist of only three rows of perforated metal shells filled ...

In the building acoustics field usually fibrous materials are used as sound absorbing materials. Nowadays polyester fiber is one of the most used but the pure chip of polyester has a problem. Polyester is obtained of ...

[EN] We report a theoretical and experimental study of an array of Helmholtz resonators optimized to achieve both efficient sound absorption and diffusion. The analysis starts with a simplified 1D model where the plane ...

[EN] The use of microcapsules is increasing in the textile industry and play an important role in the field of acoustical porous materials in order to adopt solutions for the control of noise. In this work, we present an ...