Elucidating the Sound Absorption Characteristics of Foxtail Millet (Setariaitalica ) Husk

Materials
Dhayalini BalasubramanianNirmalakumari Angamuthu

Abstract

The current study deals with the analysis of sound absorption characteristics of foxtail millet husk powder. Noise is one the most persistent pollutants which has to be dealt seriously. Foxtail millet is a small seeded cereal cultivated across the world and its husk is less explored for its utilization in polymer composites. The husk is the outer protective covering of the seed, rich in silica and lingo-cellulose content making it suitable for sound insulation. The acoustic characterization is done for treated foxtail millet husk powder and polypropylene composite panels. The physical parameters like fiber mass content, density, and thickness of the composite panel were varied and their influence over sound absorption was mapped. The influence of porosity, airflow resistance, and tortuosity was also studied. The experimental result shows that 30-mm thick foxtail millet husk powder composite panel with 40% fiber mass content, 320 kg/m3 density showed promising sound absorption for sound frequency range above 1000 Hz. We achieved noise reduction coefficient (NRC) value of 0.54. In view to improve the performance of the panel in low-frequency range, we studied the efficiency of incorporating air gap and rigid backing material to t...Continue Reading

References

Mar 25, 2009·Proceedings of the National Academy of Sciences of the United States of America·Loukas BartonRobert L Bettinger
Sep 19, 2012·Critical Reviews in Biotechnology·Charu LataManoj Prasad
May 9, 2019·Polymers·Lihua LyuJing Guo

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