| Autor: |
Muralidharan, Vaishnavi |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2022, Vol. 2446 Issue 1, p1-5, 5p |
| Abstrakt: |
Sound absorption of structures developed from coir fibres is studied. The aim of the present work is to develop a hybrid structure from coir nonwoven matts and snippets (finely shredded denim fabric) for broad frequency sound absorption. This is achieved by first developing a multilayer density gradient structure using compressed coir matts. The sound absorption behaviour of this structure shows good absorption in the mid and high frequency range because the structure has increasing density, tortuosity and flow resistivity through the thickness that leads to better frictional loss of the sound wave. Hybrid structure is developed by layering the density gradient coir structure with a sound facing layer (made up of 1mm snippets sprayed on the surface of coir sheet). Addition of snippets forms small sized pores on the surface of the coir sheet thus increasing the surface area. The thin panel like structure of the sound facing layer improves low frequency sound absorption showing characteristic peaks but decreases absorption in high frequency. Snippets improve this vibrational loss and increases low frequency absorption. The hybrid structure is developed to cater to broad frequency absorption. Results show an improvement of 66.67% in NRC when 5% snippets sprayed on the coir sheet surface is used as a face layer along with the density gradient structure, thus showing improved absorption in hybrid structures. Further optimization of the parameters of the hybrid structure will ensure enhanced broad frequency sound absorption. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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