Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
A Study on Mineral Wools Acoustic Double Porosity Materials
Submission Author:
Giovanna Pisicchio Zanoni , SP
Co-Authors:
Giovanna Pisicchio Zanoni, Alberto Luiz Serpa, Rita Zoppi
Presenter: Giovanna Pisicchio Zanoni
doi://10.26678/ABCM.COBEM2017.COB17-0329
Abstract
Acoustic porous materials with macroperforations are considered double porosity materials. Recent studies show its potential in the improvement of sound absorption at low frequencies in acoustic porous materials, known to have a poor performance at this range of frequencies. In this study, the acoustic characterization of these materials is made using glasswool and rockwool. Impedance Tube tests for sound absorption and sound transmission loss were performed. For sound absorption, a small gain was observed for rockwool samples with perforations, in both situations, i.e., with perforations not filled and filled with glasswool. For glasswool samples containing mesopores (filled or not with rockwool), in general, no significant gain in absorption was verified, except for glasswool samples filled with rockwool (with mesoporosities equal to 0.11 and 0.14), in which a small gain in absorption was observed around 2000 Hz. Transmission loss tests show that there is a gain in insulation for all samples of glasswool containing mesopores filled with rockwool. For samples of rockwool containing mesopores filled with glasswool, a TL gain, for all investigated frequency range, was observed only when mesoporosity was very small.
Keywords
Acoustics, Double Porosity Materials, Absorption, Transmission Loss
