دانلود رایگان مقاله خواص صوتی و حرارتی پارچه های سلولزی نبافته طبیعی

Abstract

The desire to mitigate climate change due to greenhouse gas emissions has led to the exploration of plant fibers as alternative materials for various industrial applications, sound absorption inclusive. In this investigation, sound absorption properties of Antiaris toxicaria barkcloth, and the thermal insulation properties of the barkcloth epoxy laminar composites were characterized. Theoretical sound absorption models were utilized to validate the experimental data and the empirical models were in agreement with experimental data. The lowest thermal conductivity was achieved by the Antiaris toxicaria epoxy composites.

4. Conclusions

In this investigation, the thermal and acoustic properties and prediction models were presented. Barkcloth had a low thermal conductivity and this has a multiplier effect which results in good sound absorption behavior. The results show that barkcloth nonwoven fabric has good sound absorption properties and can be used as an alternative replacement for the synthetic commercial fibers which are widely used in the industry. The investigated sound absorption properties showed that Antiaris toxicaria barkcloth has higher sound absorption properties at higher frequencies. Increasing the barkcloth fiber layers showed a positive trend towards sound absorption coefficient, therefore giving a prediction of multi-layer products of antiaris barkcloth with potential to provide positive results even at low frequency ranges. Incorporation of an airgap using prediction models had a positive impact on the overall sound absorption properties of the fabrics. The fabrics can therefore be designed at absorbing particular frequencies depending on the sound absorption.